The Downtown Seattle Transit Tunnel (DSTT), also referred to as the Metro Bus Tunnel, is a pair of
public transit
Public transport (also known as public transportation, public transit, mass transit, or simply transit) is a system of transport for passengers by group travel systems available for use by the general public unlike private transport, typical ...
tunnel
A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube cons ...
s in
Seattle
Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest regio ...
,
Washington
Washington commonly refers to:
* Washington (state), United States
* Washington, D.C., the capital of the United States
** A metonym for the federal government of the United States
** Washington metropolitan area, the metropolitan area centered o ...
, United States. The
double-track
A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track.
Overview
In the earliest days of railways in the United Kingdom, most li ...
tunnel and its four stations serve
Link light rail
Link light rail is a light rail rapid transit system serving the Seattle metropolitan area in the U.S. state of Washington. It is managed by Sound Transit in partnership with local transit providers, and consists of two non-connected lines: ...
trains on the
1 Line as it travels through
Downtown Seattle. It runs west under
Pine Street
Pine Street is a major east–west street in Seattle, Washington, United States. It travels parallel to Pike Street between Downtown Seattle and the retail core to Capitol Hill, the Central District, and Madrona.
Street description
Pine S ...
from 9th Avenue to 3rd Avenue, and south under 3rd Avenue to South Jackson Street. 1 Line trains continue north from the tunnel to
Northgate station and south through the
Rainier Valley past
Seattle–Tacoma International Airport
Seattle–Tacoma International Airport , branded as SEA Airport and also referred to as Sea–Tac (), is the primary commercial airport serving the Seattle metropolitan area in the U.S. state of Washington. It is in the city of SeaTac, which ...
to
Angle Lake station as part of
Sound Transit
Sound Transit (ST), officially the Central Puget Sound Regional Transit Authority, is a public transit agency serving the Seattle metropolitan area in the U.S. state of Washington. It operates the Link light rail system in Seattle and Tacoma, r ...
's
light rail network.
The DSTT was used only by
buses from its opening in 1990 until 2005, and shared by buses and
light rail from 2009 until 2019. Bus routes from
King County Metro
King County Metro, officially the King County Metro Transit Department and often shortened to Metro, is the public transit authority of King County, Washington, which includes the city of Seattle. It is the eighth-largest transit bus agency in t ...
and
Sound Transit Express
Sound Transit Express (ST Express) is a network of regional express buses, operated by the multi-county transit agency, Sound Transit. The routes connect major regional hubs throughout 53 cities in three counties (King, Pierce, and Snohomish) i ...
left the tunnel north via
Interstate 5
Interstate 5 (I-5) is the main north–south Interstate Highway on the West Coast of the United States, running largely parallel to the Pacific coast of the contiguous U.S. from Mexico to Canada. It travels through the states of Californi ...
, south via the
SODO Busway
The SODO Busway, also referred to as the E-3 Busway, is a busway in the SoDo neighborhood of Seattle, Washington. It has four stops, including two that connect to Link light rail stations, and functions as an extension of the Downtown Seattl ...
, or east via
Interstate 90
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain West, Great Plains, Midwest, and ...
. It was owned by King County Metro and shared with Sound Transit through a joint-operating agreement signed in 2002; Sound Transit assumed full ownership in 2022. The Downtown Seattle Transit Tunnel was one of two tunnels in the United States shared by buses and trains, the other being the
Mount Washington Transit Tunnel
Mount Washington Transit Tunnel is an important public transportation link in Pittsburgh, Pennsylvania, United States. The Middleton, William D. (1967). ''The Time of the Trolley'', p. 195. Milwaukee, WI (US): Kalmbach Publishing Co. LCCN 67-201 ...
in
Pittsburgh
Pittsburgh ( ) is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County, Pennsylvania, Allegheny County. It is the most populous city in both Allegheny County and Wester ...
, and was the only one in the United States with shared stations.
Though proposals for a
rapid transit
Rapid transit or mass rapid transit (MRT), also known as heavy rail or metro, is a type of high-capacity public transport generally found in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be c ...
tunnel under 3rd Avenue were introduced in the 1910s and 1920s, planning for the modern bus and rail Metro Bus Tunnel only began in 1974. The King County Metro Council approved the bus tunnel proposal in November 1983, but construction did not begin until March 1987. The tunnel between
Convention Place and
Westlake stations was built using the
cut-and-cover
A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube constr ...
method, closing Pine Street for 19 months and disrupting access to the retail core. The segment from Westlake to the
International District was bored with two
tunnel-boring machine
A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can be designed to bore thro ...
s, heading north from
Union Station
A union station (also known as a union terminal, a joint station in Europe, and a joint-use station in Japan) is a railway station at which the tracks and facilities are shared by two or more separate railway companies, allowing passengers to ...
and finishing within a month of each other. Tests of normal buses and the
Breda
Breda () is a city and municipality in the southern part of the Netherlands, located in the province of North Brabant. The name derived from ''brede Aa'' ('wide Aa' or 'broad Aa') and refers to the confluence of the rivers Mark and Aa. Breda has ...
dual-mode bus
A dual-mode bus is a bus that can run independently on power from two different sources, typically electricity from overhead lines like a trolleybus or from batteries like a hybrid bus, alternated with conventional fossil fuel (generally diesel ...
es built specifically for tunnel routes began in March 1989; tunnel construction was declared complete in June 1990, at a cost of $469 million. Light rail tracks were installed in anticipation of future rapid transit service through the tunnel, but were later found to be poorly insulated and unusable for Link light rail.
Soft opening
A soft launch, also known as a soft opening, is a preview release of a product or service to a limited audience prior to the general public. Soft-launching a product is sometimes used to gather data or customer feedback, prior to making it widely ...
s and public previews of the five tunnel stations were held from August 1989 to September 1990, with regular bus service beginning on September 15, carrying 28,000 daily passengers in its first year of operation. For the next several years, until June 2004, service in the tunnel was provided exclusively by dual-mode buses, which ran as
trolleybus
A trolleybus (also known as trolley bus, trolley coach, trackless trolley, trackless tramin the 1910s and 1920sJoyce, J.; King, J. S.; and Newman, A. G. (1986). ''British Trolleybus Systems'', pp. 9, 12. London: Ian Allan Publishing. .or trol ...
es in the tunnellike the city's
extensive trolleybus systemand as diesel buses on surface streets and freeways.
The tunnel was closed on September 24, 2005, for modification to accommodate both buses and Sound Transit's Central Link (now th e1 Line) light rail trains with shared lanes and platforms. The roadway was lowered by and other improvements were made to prepare for light rail service. New
hybrid electric bus
A hybrid electric bus is a bus that combines a conventional internal combustion engine propulsion system with an electric propulsion system. These type of buses normally use a Diesel-electric powertrain and are also known as hybrid Diesel-el ...
es were moved into the tunnel to replace the Breda fleet, as the
overhead wire
An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, trolleybuses or trams. It is known variously as:
* Overhead catenary
* Overhead contact system (OCS)
* Overhead equipm ...
was replaced for light rail trains. The tunnel reopened on September 24, 2007, and light rail service began on July 18, 2009. A stub tunnel, branching from the main tunnel, was constructed under Pine Street to allow light rail trains to stop and reverse direction; it was later used as the first segment of a
light rail extension to
Capitol Hill
Capitol Hill, in addition to being a metonym for the United States Congress, is the largest historic residential neighborhood in Washington, D.C., stretching easterly in front of the United States Capitol along wide avenues. It is one of the ...
and the
University of Washington
The University of Washington (UW, simply Washington, or informally U-Dub) is a public research university in Seattle, Washington.
Founded in 1861, Washington is one of the oldest universities on the West Coast; it was established in Seattle a ...
that opened in 2016. Convention Place station was closed permanently on July 21, 2018, to make way for an expansion of the
Washington State Convention Center
The Seattle Convention Center (SCC), formerly the Washington State Convention Center (WSCC), is a convention center in Seattle, Washington (state), Washington, United States. It consists of several exhibition halls and meeting rooms in building ...
that would also restrict bus access to the tunnel. On March 23, 2019, bus service in the tunnel ceased and its remaining seven routes were moved to surface streets.
Route and stations
![Seattle - Pioneer Square Station July 2009](https://upload.wikimedia.org/wikipedia/commons/e/e3/Seattle_-_Pioneer_Square_Station_July_2009.jpg)
The ,
tunnel is used by the
1 Line between
Westlake and
International District/Chinatown stations.
Entrances at several tunnel stations are built into nearby buildings with
variable-message sign
A variable- (also changeable-, electronic-, or dynamic-) message sign, often abbreviated VMS, CMS, or DMS, and in the UK known as a matrix sign,
is an electronic traffic sign often used on roadways to give travelers information about special ...
s over the stairs and elevators leading to the
mezzanines. A total of 11
wheelchair
A wheelchair is a chair with wheels, used when walking is difficult or impossible due to illness, injury, problems related to old age, or disability. These can include spinal cord injuries ( paraplegia, hemiplegia, and quadriplegia), cerebr ...
-
accessible
Accessibility is the design of products, devices, services, vehicles, or environments so as to be usable by people with disabilities. The concept of accessible design and practice of accessible development ensures both "direct access" (i. ...
elevators connect the tunnel stations to the surface. The deepest of the tunnel stations are below street level and consist of two
side platform
A side platform (also known as a marginal platform or a single-face platform) is a platform positioned to the side of one or more railway tracks or guideways at a railway station, tram stop, or transitway. A station having dual side platforms ...
s, two tracks, and a former bus passing lane in the middle.
Since 2019, the stations have also had signs with numbered exits to aid in rider wayfinding. As part of the city's
public art
Public art is art in any Media (arts), media whose form, function and meaning are created for the general public through a public process. It is a specific art genre with its own professional and critical discourse. Public art is visually and phy ...
program that began in 1973, the Downtown Seattle Transit Tunnel and its stations were furnished with $1.5 million (equivalent to $ million in dollars) in artwork by 25 artists commissioned by King County Metro.
The northern portal, formerly accessible to buses at street level from Olive Way, and from
Interstate 5
Interstate 5 (I-5) is the main north–south Interstate Highway on the West Coast of the United States, running largely parallel to the Pacific coast of the contiguous U.S. from Mexico to Canada. It travels through the states of Californi ...
via an
express lane ramp, was the former
Convention Place station
Convention Place was a bus station in Seattle, Washington, United States. It served as the northern terminus of the Downtown Seattle Transit Tunnel and was used by King County Metro and Sound Transit Express buses. Link light rail, which stops ...
at the intersection of 9th Avenue and Pine Street near the
Washington State Convention Center
The Seattle Convention Center (SCC), formerly the Washington State Convention Center (WSCC), is a convention center in Seattle, Washington (state), Washington, United States. It consists of several exhibition halls and meeting rooms in building ...
. Until its closure in 2018, Convention Place was the only bus-exclusive station in the tunnel, and consisted of four sheltered platforms in a sunken, open-air
layover space below street level.
Buses entered the tunnel from 9th Avenue and passed under the historic
Camlin Hotel, before joining the
University Link Tunnel used by light rail trains headed north for three blocks under
Pine Street
Pine Street is a major east–west street in Seattle, Washington, United States. It travels parallel to Pike Street between Downtown Seattle and the retail core to Capitol Hill, the Central District, and Madrona.
Street description
Pine S ...
to
Capitol Hill station
Capitol Hill station is a light rail station in the Capitol Hill neighborhood of Seattle, Washington, United States. The station is served by Sound Transit's Link light rail system and is located near the intersection of Broadway and East Jo ...
.
The DSTT enters Westlake station under Pine Street between 3rd and 6th avenues, located between the
Westlake Center
Westlake Center is a four-story shopping center and 25-story office tower in downtown Seattle, Washington, United States. The southern terminus of the Seattle Center Monorail, it is located across Pine Street from Westlake Park, between 4th and ...
shopping mall and
Westlake Park Westlake Park can mean:
*Westlake Park (Seattle), a park in Seattle, Washington
* MacArthur Park, formerly Westlake Park, in Los Angeles, California
*Westlake Park (Houston)
Westlake Park is a office complex located in the Energy Corridor, Housto ...
. The station features a two-block-long mezzanine with exits to Pine Street and several retailers, including the Westlake Center, the former
The Bon Marché
The Bon Marché, whose French name translates to "the good market" or "the good deal", was a department store chain launched in Seattle, Washington, United States, in 1890 by Edward Nordhoff. The name was influenced by Le Bon Marché, the note ...
flagship store, and the
Nordstrom Building, as well as the former King County Metro
customer service
Customer service is the assistance and advice provided by a company to those people who buy or use its products or services. Each industry requires different levels of customer service, but in the end, the idea of a well-performed service is that ...
center. The area around the station is known as the Westlake Hub, with connections to the
South Lake Union Streetcar
The South Lake Union Streetcar, officially the South Lake Union Line, is a streetcar route in Seattle, Washington, United States, forming part of the Seattle Streetcar system. It travels and connects Downtown Seattle to the South Lake Union n ...
and the
Seattle Center Monorail
The Seattle Center Monorail is an elevated straddle-beam monorail line in Seattle, Washington, United States. The monorail runs along 5th Avenue between Seattle Center and Westlake Center in Downtown Seattle, making no intermediate stops. ...
as well as the King County Metro and Sound Transit buses. Leaving Westlake Station, the bored set of twin tunnels turn south under Century Square to follow 3rd Avenue and its
transit mall
A transit mall is a street, or set of streets, in a city or town along which automobile traffic is prohibited or greatly restricted and only public transit vehicles, bicycles, and pedestrians are permitted.
Transit malls are instituted by communi ...
through the
central business district
A central business district (CBD) is the commercial and business centre of a city. It contains commercial space and offices, and in larger cities will often be described as a financial district. Geographically, it often coincides with the "city ...
, parallel to the shoreline of
Elliott Bay
Elliott Bay is a part of the Central Basin region of Puget Sound. It is in the U.S. state of Washington, extending southeastward between West Point in the north and Alki Point in the south. Seattle was founded on this body of water in the 1850s ...
.
Three blocks south of Pine Street, buses and trains enter
University Street station
University Street station is a light rail Metro station, station that is part of the Downtown Seattle Transit Tunnel in Seattle, Washington, United States. The station is located under 3rd Avenue at University Street, near Benaroya Hall, and i ...
, located between Union and Seneca streets adjacent to
Benaroya Hall and
1201 Third Avenue
1201 Third Avenue (formerly Washington Mutual Tower) is a , 55-story skyscraper in Downtown Seattle, in the U.S. state of Washington. It is the third-tallest building in the city, the eighth-tallest on the West Coast of the United States, and t ...
in the financial district. The station has a split mezzanine, with entrances to 2nd Avenue and University Street accessible from the north half, and an entrance to Seneca Street from the south half. From University Street, the tunnel continues under 3rd Avenue for five blocks, entering the
Pioneer Square neighborhood and
historic district
A historic district or heritage district is a section of a city which contains older buildings considered valuable for historical or architectural reasons. In some countries or jurisdictions, historic districts receive legal protection from c ...
. At this point, 3rd Avenue passes several of Seattle's skyscrapers, including the historic
Seattle Tower,
Safeco Plaza
Safeco Plaza (formerly known as 1001 Fourth Avenue Plaza, the Seafirst Building, and the Seattle-First National Bank Building) is a 50-story skyscraper in Downtown Seattle, Washington, United States. Designed by the Naramore, Bain, Brady, and ...
, the
Fourth and Madison Building
The Fourth and Madison Building (formerly the IDX Tower) is a 40-story skyscraper in downtown Seattle, Washington. The building is located at 925 Fourth Avenue, at the intersection with Madison Street. Upon its completion in 2002, the late-modern ...
and the
Wells Fargo Center Wells Fargo Center may refer to:
*Wells Fargo Center (Los Angeles), California
*Wells Fargo Center (Sacramento), California
* Wells Fargo Center (San Francisco), California
* Wells Fargo Center for the Arts, Santa Rosa, California
* Wells Fargo Cen ...
.
Within University Street station, the tunnel passes over the century-old
Great Northern Tunnel with a clearance of .
Pioneer Square station
Pioneer Square station is a light rail station that is part of the Downtown Seattle Transit Tunnel in Seattle, Washington, United States. The station is located under 3rd Avenue at James Street, between University Street and International D ...
is located between Cherry Street and Yesler Way, with four entrances to nearby streets and Prefontaine Place serving two mezzanines. The station serves the
administrative center
An administrative center is a seat of regional administration or local government, or a county town, or the place where the central administration of a commune
A commune is an alternative term for an intentional community. Commune or comună or ...
s of the Seattle and King County governments, located within walking distance of
Seattle City Hall
Seattle City Hall (also known as the Seattle Municipal Building) is the home of the offices of the mayor and city council of Seattle, Washington, located between 4th Avenue and 5th Avenue in the downtown area of the city. Most city departments h ...
, the
Seattle Municipal Tower
Seattle Municipal Tower is a skyscraper in downtown Seattle, Washington. At , it is the fifth-tallest building in the city. Completed in 1990, it was initially named AT&T Gateway Tower and subsequently KeyBank Tower after its anchor tenants AT&T ...
, the
King County Courthouse
The King County Courthouse is the administrative building housing the judicial branch of King County, Washington's government. It is located in downtown Seattle, just north of Pioneer Square. The 1916 structure houses the King County Prosecuting ...
and the
King County Administration Building
The King County Administration Building is a nine-story office building in Seattle, the seat of King County, Washington, United States. Completed in 1971, the building is located at 500 Fourth Avenue, in between Jefferson Street and James Street, a ...
, as well as other major buildings, including
Smith Tower
Smith Tower is a skyscraper in the Pioneer Square neighborhood of Seattle, Washington, United States. Completed in 1914, the 38- story, tower is the oldest skyscraper in the city and was among the tallest skyscrapers outside New York City at t ...
,
Columbia Center
The Columbia Center, formerly named the Bank of America Tower and Columbia Seafirst Center, is a skyscraper in downtown Seattle, Washington, United States. The 76-story structure is the tallest building in Seattle and the state of Washington, r ...
and the
Alaska Building. From Pioneer Square, the tunnel travels down a 5.5%
grade
Grade most commonly refers to:
* Grade (education), a measurement of a student's performance
* Grade, the number of the year a student has reached in a given educational stage
* Grade (slope), the steepness of a slope
Grade or grading may also ref ...
to cross under the Great Northern Tunnel at a 45-degree angle near the intersection of 4th Avenue South and South Washington Street, briefly descending below
sea level
Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardised g ...
, before turning
cardinal south into the
International District neighborhood.
International District/Chinatown station, the southernmost tunnel station, is partially open-air and located immediately below a public plaza at
Union Station
A union station (also known as a union terminal, a joint station in Europe, and a joint-use station in Japan) is a railway station at which the tracks and facilities are shared by two or more separate railway companies, allowing passengers to ...
. The station has connections to
Amtrak
The National Railroad Passenger Corporation, Trade name, doing business as Amtrak () , is the national Passenger train, passenger railroad company of the United States. It operates inter-city rail service in 46 of the 48 contiguous United Stat ...
and
Sounder commuter rail
Sounder commuter rail is a commuter rail service operated by BNSF on behalf of Sound Transit. Service operates Monday through Friday during peak hours from Seattle, Washington, north to Everett and south to Lakewood. In , the system had a ride ...
at
King Street Station
King Street Station is a train station in Seattle, Washington, United States. It is served by Amtrak's '' Cascades'', ''Coast Starlight'', and ''Empire Builder'', as well as Sounder commuter trains run by Sound Transit. The station also anchor ...
a block to the west, accessible through the Weller Street Bridge, as well as the
First Hill Streetcar
The First Hill Streetcar, officially the First Hill Line, is a streetcar route in Seattle, Washington, United States, forming part of the modern Seattle Streetcar system. It travels between several neighborhoods in central Seattle, including th ...
on Jackson Street, stopping east of 5th Avenue South. Other attractions near the station include
Lumen Field
Lumen Field is a multi-purpose stadium in Seattle, Washington, United States. Located in the city's SoDo neighborhood, it is the home field for the Seattle Seahawks of the National Football League (NFL), the Seattle Sea Dragons of the XFL, t ...
to the west and
Uwajimaya
Uwajimaya, Inc., doing business as , is a family-owned supermarket chain with its corporate headquarters in the International District, Seattle, Washington, and with locations in Greater Seattle and Oregon. Uwajimaya sells mainly Asian food—w ...
a block to the southeast.
South of the station, the light rail tracks and bus lanes were formerly separated by
railway signal
A railway signal is a visual display device that conveys instructions or provides warning of instructions regarding the driver’s authority to proceed. The driver interprets the signal's indication and acts accordingly. Typically, a signal mi ...
s at an underground bus layover and
staging area
A staging area (otherwise staging point, staging base, or staging post) is a location in which organisms, people, vehicles, equipment, or material are assembled before use. It may refer to:
* In construction, a designated area in which vehicles, ...
next to the tunnel
comfort room
A toilet is a small room used for privately accessing the sanitation fixture (toilet) for urination and defecation. Toilet rooms often include a sink (basin) with soap/handwash for handwashing, as this is important for personal hygiene. These ro ...
for bus drivers.
The southern portal of the tunnel is located under the intersection of Airport Way and 5th Avenue South at the western terminus of the former
Interstate 90
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain West, Great Plains, Midwest, and ...
express lanes for
high-occupancy vehicles. Until bus operations ceased, southbound routes continued from the tunnel in separated lanes on the
SODO Busway
The SODO Busway, also referred to as the E-3 Busway, is a busway in the SoDo neighborhood of Seattle, Washington. It has four stops, including two that connect to Link light rail stations, and functions as an extension of the Downtown Seattl ...
, while eastbound buses used a set of ramps that traveled onto the Interstate 90 express lanes. The eastbound ramps will be retrofitted for the
East Link light rail service that begins in 2025 on the 2 Line.
Service
The Downtown Seattle Transit Tunnel is part of the "Third Avenue Transit Spine", the busiest transit corridor in Seattle, serving a combined average of 54,000 weekday riders with bus stops on the surface. The tunnel has a theoretical capacity of 40 trains per hour per direction with a minimum of 90-second
headway
Headway is the distance or duration between vehicles in a transit system measured in space or time. The ''minimum headway'' is the shortest such distance or time achievable by a system without a reduction in the speed of vehicles. The precise defi ...
s, carrying 22,000
passengers per hour per direction
Passengers per hour per direction (p/h/d), passengers per hour in peak direction (pphpd) or corridor capacity is a measure of the route capacity of a rapid transit or public transport system.
Definition
The corridor capacity in the passenger t ...
, but is only able to carry 12,000 per hour per direction in 4-car light rail vehicles with current systems in place. Prior to the start of Link light rail service, the DSTT could serve up to 145 buses during the afternoon
rush hour
A rush hour (American English, British English) or peak hour (Australian English) is a part of the day during which traffic congestion on roads and crowding on public transport is at its highest. Normally, this happens twice every weekday: on ...
. , the DSTT carried 52,600 daily riders, of which 10,000 are on light rail.
The tunnel carries a segment of the 1 Line, which runs from
Northgate station through
Downtown Seattle and the
Rainier Valley, and terminates at
Angle Lake station near
Seattle–Tacoma International Airport
Seattle–Tacoma International Airport , branded as SEA Airport and also referred to as Sea–Tac (), is the primary commercial airport serving the Seattle metropolitan area in the U.S. state of Washington. It is in the city of SeaTac, which ...
. Trains serve all downtown tunnel stations 20 hours a day every day; during regular weekday service, trains run roughly every six to 10 minutes during rush hour and midday operation, respectively, with longer headways of 15 minutes in the early morning and 20 minutes at night. During weekends, 1 Line trains arrive every 10 minutes during midday hours and every 15 minutes during mornings and evenings. Light rail service from Westlake to International District/Chinatown takes approximately seven minutes.
Prior to the cessation of bus service in March 2019, the DSTT was served by seven bus routes that stopped at all four tunnel stations as well as stops near the former
Convention Place station
Convention Place was a bus station in Seattle, Washington, United States. It served as the northern terminus of the Downtown Seattle Transit Tunnel and was used by King County Metro and Sound Transit Express buses. Link light rail, which stops ...
.
At each station, bus routes were divided into three bays labeled with their general direction. Bay A was served by three routes heading north toward
Northgate and the
University District and east to
Kirkland via
State Route 520; Bay C was served by three routes heading south through the SODO Busway toward the Rainier Valley and
Renton; and Bay D was served by a single route, Sound Transit Express route 550, heading east to
Mercer Island
Mercer Island is a city in King County, Washington, United States, located on an island of the same name in the southern portion of Lake Washington. Mercer Island is in the Seattle metropolitan area, with Seattle to its west and Bellevue to it ...
and
Bellevue Bellevue means "beautiful view" in French. It may refer to:
Placenames
Australia
* Bellevue, Western Australia
* Bellevue Hill, New South Wales
* Bellevue, Queensland
* Bellevue, Glebe, an historic house in Sydney, New South Wales
Canada ...
via Interstate 90.
During closures of the Downtown Seattle Transit Tunnel, tunnel buses were rerouted onto 2nd and 4th Avenues between Yesler Way and Pine Street, and Stewart Street and Olive Way between 2nd and Boren Avenues. Metro also runs a
special route
In road transportation in the United States, a special route is a road in a numbered highway system that diverts a specific segment of related traffic away from another road. They are featured in many highway systems; most are found in the Int ...
, the
Route 97 Link Shuttle, between all Link light rail stations during service disruptions.
Operations
The DSTT is open for 20 hours on weekdays and Saturdays, from 5:00 am to 1:00 am the following day, and for 18 hours on Sundays, from 6:00 am to midnight.
At the time of its opening in 1990, the Metro Bus Tunnel only operated from 5:00 am to 7:00 pm on weekdays and 10:00 am to 6:00 pm on Saturdays, with no Sunday service;
the operating hours were temporarily extended into weekday nights from 1998 to 2000 at the request of the
Seattle Seahawks
The Seattle Seahawks are a professional American football team based in Seattle. The Seahawks compete in the National Football League (NFL) as a member club of the league's National Football Conference (NFC) West, which they rejoined in 2002 as ...
and
Seattle Mariners
The Seattle Mariners are an American professional baseball team based in Seattle. They compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, West division. The team joined the American League ...
, but were cut after the passage of
Initiative 695 and subsequent loss of motor vehicle
excise tax
file:Lincoln Beer Stamp 1871.JPG, upright=1.2, 1871 U.S. Revenue stamp for 1/6 barrel of beer. Brewers would receive the stamp sheets, cut them into individual stamps, cancel them, and paste them over the Bunghole, bung of the beer barrel so when ...
revenue. Preparations for Link light rail service restored late-night and full weekend hours for the tunnel, introduced in June 2009 after Sound Transit Express route 550 moved all of its trips into the tunnel.
Coordination between trains in the tunnel is managed by the Link Light Rail Operations Control Center (OCC), located at the King County Metro Communication and Control Center in
SoDo
Sodo ( am, ሶዶ) or Wolaita Sodo ( am, ወላይታ ሶዶ) or ( Wolaytatto: ''Wolayta Sodo Ambbaa'') is a city in south-central Ethiopia. The administrative center of the Wolaita Zone. It has a latitude and longitude of with an elevation bet ...
. The OCC controls vehicle movements (and formerly operations between buses and trains) by using on-board
radio-frequency identification tags installed on tunnel buses and light rail vehicles, their locations tracked by passing over
induction loop
An induction or inductive loop is an electromagnetic communication or detection system which uses a moving magnet or an alternating current to induce an electric current in a nearby wire. Induction loops are used for transmission and reception of ...
s embedded in the tunnel roadway. Signals at each station indicate when a driver can proceed through the tunnel. Within the DSTT,
speed limit
Speed limits on road traffic, as used in most countries, set the legal maximum speed at which vehicles may travel on a given stretch of road. Speed limits are generally indicated on a traffic sign reflecting the maximum permitted speed - expres ...
s are set at in stations and staging areas and between stations. During joint operations, Light rail trains and buses were required to wait in the tunnels between stations until the platform was cleared of vehicles ahead; buses were mandated to keep a minimum of six seconds of separation between each other.
During joint bus–rail operations, two types of vehicles were used in the Downtown Seattle Transit Tunnel: Sound Transit's
Kinkisharyo-Mitsui light rail vehicles and King County Metro's
New Flyer
New Flyer is a Canadian multinational bus manufacturer, specializing in the production of transit buses. New Flyer is owned by the NFI Group, a holding company for several bus manufacturers. New Flyer has several manufacturing facilities in Can ...
diesel-electric hybrid buses. The New Flyer buses, dubbed "tunnel buses" by King County Metro, were ordered in 2004 to replace a fleet of
Breda
Breda () is a city and municipality in the southern part of the Netherlands, located in the province of North Brabant. The name derived from ''brede Aa'' ('wide Aa' or 'broad Aa') and refers to the confluence of the rivers Mark and Aa. Breda has ...
dual-mode electric
trolleybus
A trolleybus (also known as trolley bus, trolley coach, trackless trolley, trackless tramin the 1910s and 1920sJoyce, J.; King, J. S.; and Newman, A. G. (1986). ''British Trolleybus Systems'', pp. 9, 12. London: Ian Allan Publishing. .or trol ...
es whose
overhead wire
An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, trolleybuses or trams. It is known variously as:
* Overhead catenary
* Overhead contact system (OCS)
* Overhead equipm ...
was to be removed in the tunnel's renovation for light rail; 59 of the dual-mode Breda coaches were converted into fully electric trolleybuses between 2004 and 2007 and moved to surface routes,
where they continued to operate for more than a decade before being fully replaced in 2016.
The New Flyer
low-floor
Accessibility is the design of products, devices, services, vehicles, or environments so as to be usable by people with disabilities. The concept of accessible design and practice of accessible development ensures both "direct access" (i. ...
,
articulated buses feature a "hush mode" that allowed buses to operate solely on stored electric power within the tunnel, minimizing emissions and noise.
History
Previous subway proposals
Several proposals for a
cut-and-cover subway tunnel under 3rd Avenue in Downtown Seattle were presented to the City of Seattle by predecessors of the
Seattle Planning Commission throughout the 20th century. The first major proposal was part of urban planner
Virgil Bogue
Publius Vergilius Maro (; traditional dates 15 October 7021 September 19 BC), usually called Virgil or Vergil ( ) in English, was an ancient Roman poet of the Augustan period. He composed three of the most famous poems in Latin literature: t ...
's "Plan for Seattle" in 1911, as Route 1 of a proposed
rapid transit
Rapid transit or mass rapid transit (MRT), also known as heavy rail or metro, is a type of high-capacity public transport generally found in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be c ...
network. Route 1 ran southeast on 3rd Avenue from a
circular ring around a proposed
civic center
A civic center or civic centre is a prominent land area within a community that is constructed to be its focal point or center. It usually contains one or more dominant public buildings, which may also include a government building. Recently, the ...
in the
Denny Regrade
The Denny Triangle is a neighborhood in Seattle, Washington, United States, that stretches north of the central business district to the grounds of Seattle Center. Its generally flat terrain was originally a steep hill, taken down as part of a ...
neighborhood to
King Street Station
King Street Station is a train station in Seattle, Washington, United States. It is served by Amtrak's '' Cascades'', ''Coast Starlight'', and ''Empire Builder'', as well as Sounder commuter trains run by Sound Transit. The station also anchor ...
, paralleled to the west by a subway on 1st Avenue known as Route 17; stations on the line were to have additional entrances from
department store
A department store is a retail establishment offering a wide range of consumer goods in different areas of the store, each area ("department") specializing in a product category. In modern major cities, the department store made a dramatic app ...
s and other major businesses on 3rd Avenue. The plan was supported by City Engineer
Reginald H. Thomson and the Municipal League among others, but opposed by businesses fearing it would shift the commercial district further north, and by the three daily newspapers published in Seattle. A special
municipal election
In many parts of the world, local elections take place to select office-holders in local government, such as mayors and councillors. Elections to positions within a city or town are often known as "municipal elections". Their form and conduct vary ...
for the
comprehensive plan
Comprehensive planning is an ordered process that determines community goals and aspirations in terms of community development. The end product is called a comprehensive plan, also known as a general plan, or master plan. This resulting document e ...
was held on March 5, 1912, in which Seattle voters rejected it by a 10,000-vote margin.
Although Bogue's proposal was ultimately rejected, some elements of the plan were independently studied by others, including a rapid transit subway in Downtown Seattle. In 1920, City Engineer Arthur H. Dimmock published a report recommending a rapid transit system for the city of Seattle, centered around a cut-and-cover subway tunnel under 3rd Avenue from Virginia Street to Yesler Way. The line was to connect to surface and elevated lines at Dexter Avenue, Olive Way and South Jackson Street, serving the neighborhoods of
Fremont,
Eastlake,
Capitol Hill
Capitol Hill, in addition to being a metonym for the United States Congress, is the largest historic residential neighborhood in Washington, D.C., stretching easterly in front of the United States Capitol along wide avenues. It is one of the ...
, and
North Delridge in
West Seattle
West Seattle is a conglomeration of neighborhoods in Seattle, Washington, United States. It comprises two of the thirteen districts, Delridge and Southwest, and encompasses all of Seattle west of the Duwamish River. It was incorporated as an i ...
. The proposal, which was expected not to be acted upon for at least 15 years, gained little support, and was called a project of "purely academic interest" by Mayor
Hugh M. Caldwell, who doubted that any rapid transit proposal would be seriously considered during his term. The Seattle City Planning Commission proposed its own rapid transit system in 1926, centered on an elevated line over Western Avenue with a possible parallel subway under 3rd Avenue from Yesler Way to Pike Street. The Seattle Traffic Research Commission published a report in 1928 recommending a subway under 2nd Avenue from
King Street Station
King Street Station is a train station in Seattle, Washington, United States. It is served by Amtrak's '' Cascades'', ''Coast Starlight'', and ''Empire Builder'', as well as Sounder commuter trains run by Sound Transit. The station also anchor ...
to Pike Street as part of a longer rapid transit line serving the
University District and Fremont. In the late 1950s, the Seattle Transit Commission proposed building a rapid transit system on the existing
right-of-way
Right of way is the legal right, established by grant from a landowner or long usage (i.e. by prescription), to pass along a specific route through property belonging to another.
A similar ''right of access'' also exists on land held by a gov ...
used by
Interstate 5
Interstate 5 (I-5) is the main north–south Interstate Highway on the West Coast of the United States, running largely parallel to the Pacific coast of the contiguous U.S. from Mexico to Canada. It travels through the states of Californi ...
between
Tacoma, Seattle and Everett, with a two-station subway under 5th Avenue in Downtown Seattle.
The most significant rapid transit proposal came as part of the
Forward Thrust
The Forward Thrust ballot initiatives were a series of bond propositions put to the voters of King County, Washington in 1968 and 1970, designed by a group called the Forward Thrust Committee. Seven of the twelve propositions in 1968 were success ...
initiatives of the late 1960s, which was centered around a downtown subway under 3rd Avenue. The subway would be fed by lines from
Ballard,
Lake City, the University District, Capitol Hill,
Bellevue Bellevue means "beautiful view" in French. It may refer to:
Placenames
Australia
* Bellevue, Western Australia
* Bellevue Hill, New South Wales
* Bellevue, Queensland
* Bellevue, Glebe, an historic house in Sydney, New South Wales
Canada ...
, and
Renton, combining for a planned minimum headway of minutes at rush hour, minutes during midday, and five minutes at all other times. The stations on 3rd Avenue were to be situated at South Jackson Street and 5th Avenue South, James and Cherry streets, Seneca and Spring streets, and Pike and Pine streets, all planned to open by 1985 and operated by the
Municipality of Metropolitan Seattle
King County Metro, officially the King County Metro Transit Department and often shortened to Metro, is the public transit authority of King County, Washington, which includes the city of Seattle. It is the eighth-largest transit bus agency in t ...
. Seattle voters were asked to provide $385 million (equivalent to $ in dollars), to supplement a $765 million grant (equivalent to $ in dollars) from the
Urban Mass Transportation Administration
The Federal Transit Administration (FTA) is an agency within the United States Department of Transportation (DOT) that provides financial and technical assistance to local public transportation systems. The FTA is one of ten modal administration ...
(UMTA), during a municipal election on February 13, 1968, narrowly passing the
bond
Bond or bonds may refer to:
Common meanings
* Bond (finance), a type of debt security
* Bail bond, a commercial third-party guarantor of surety bonds in the United States
* Chemical bond, the attraction of atoms, ions or molecules to form chemica ...
by 50.8%, but falling short of the required 60 percent
supermajority
A supermajority, supra-majority, qualified majority, or special majority is a requirement for a proposal to gain a specified level of support which is greater than the threshold of more than one-half used for a simple majority. Supermajority ru ...
. A second attempt on May 19, 1970, with an adjusted $440 million local contribution (equivalent to $ in dollars) and $881 million federal grant (equivalent to $ in dollars), failed to pass with only 46% approval amid a local
recession
In economics, a recession is a business cycle contraction when there is a general decline in economic activity. Recessions generally occur when there is a widespread drop in spending (an adverse demand shock). This may be triggered by various ...
caused by layoffs at
Boeing
The Boeing Company () is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, telecommunications equipment, and missiles worldwide. The company also provides leasing and product ...
; the
earmarked funds intended for the Forward Thrust rapid transit project were instead allocated to
Atlanta
Atlanta ( ) is the capital and most populous city of the U.S. state of Georgia. It is the seat of Fulton County, the most populous county in Georgia, but its territory falls in both Fulton and DeKalb counties. With a population of 498,715 ...
, to build its
rapid transit system
Rapid transit or mass rapid transit (MRT), also known as heavy rail or metro, is a type of high-capacity public transport generally found in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be c ...
.
Bus tunnel proposal and approval
The concept of a downtown bus tunnel was first proposed in 1974 during discussions between
Governor
A governor is an administrative leader and head of a polity or political region, ranking under the head of state and in some cases, such as governors-general, as the head of state's official representative. Depending on the type of political ...
Dan Evans and
Seattle Mayor Wes Uhlman
Wesley Carl Uhlman (born March 23, 1935) is an American attorney and politician who served as the 47th mayor of Seattle, Washington.
Early life and education
Uhlman was born in Cashmere, Washington. He attended Aberdeen High School, Seattle Paci ...
about regional transportation projects in response to the proposed extension of Interstate 90 into Seattle via a Homer M. Hadley Memorial Bridge, third floating bridge crossing Lake Washington. Municipality of Metropolitan Seattle, Metro Transit later commissioned a study into the bus tunnel, released the following July, which determined that it would not be able to adequately meet the rush hour demand of downtown bus ridership by 1980. The study suggested that a double-decked tunnel with automated guideway transit to complement bus service, running from Union Station to the Seattle Center, would be able to meet projected demand at an estimated cost of $450 million. Ultimately, the plan was rejected because of the high cost of ventilation for diesel buses that would use the tunnel.
The bus tunnel proposal resurfaced in 1979, outlining a tunnel from South Jackson Street to Pine Street that would carry 200 buses an hour in each direction at a cost of up to $350 million with the option of conversion for electric rail transit in the future. The tunnel was suggested by Metro officials and engineering consultants Parsons Brinckerhoff as a solution to worsening downtown traffic, and was better received than alternative concepts.
The proposal gained further support from Metro Transit in its long-term "Metro 1990" plan, adopted in 1981, as a transit mall or tunnel under 3rd Avenue carrying buses that could be converted for a light rail system. The Puget Sound Council of Governments (PSCOG), a regional planning agency, endorsed Metro Transit's proposal and integrated the tunnel into its proposed light rail line connecting Seattle to Snohomish County, Washington, Snohomish County.
The Metro Transit Committee debated the inclusion of the bus tunnel in the project's environmental impact assessment well into 1983, Seattle members opposing the tunnel in favor of a transit mall and suburban members supporting a bus tunnel that would be converted to a light rail system. On September 22, UMTA requested that a preferred alternative be declared by the end of November, which prompted the Metro Council to expedite its decision. Metro Council Executive Director Neil Peterson favored the tunnel alternative, while the Seattle City Council and Mayor Charles Royer preferred the transit mall, but stated that a tunnel would be a long-term solution to downtown congestion. The Seattle City Council reversed its decision on their preferred alternative, voting unanimously on October 17 in favor of an electric-only transit tunnel. Along with Mayor Royer, they were willing to compromise on Peterson's proposed dual-mode buses to serve suburban commuters where trolleybuses were not feasible. The Metro Council approved the downtown bus tunnel by a unanimous vote on November 3, 1983, estimating a cost of $300 million to build a five-station tunnel under 3rd Avenue and Pine Street to be completed in 1989 along with the conversion of 3rd Avenue into a landscaped transit mall.
Planning, funding and design
Metro unveiled its preliminary plans for the bus tunnel in January 1984, selecting five sites for stations along 3rd Avenue and Pine Street: at Union Station, the King County Courthouse, between Seneca and Union streets, at the Westlake Mall, and near the Washington State Convention Center. The Burlington Northern Railroad opposed Metro's preference for the tunnel to cross the existing
Great Northern Tunnel by going under it, the agency stating that passing over would require a cut-and-cover tunnel that would disrupt City Hall Park (Seattle), City Hall Park.
The following month, Metro announced that it would use a fleet of 200 dual-mode buses for the first decade of tunnel operations, with an eventual switch to subway trains. The bored tunnel would be able to carry 180 buses an hour in each direction, serving either a wide island platform or two smaller
side platform
A side platform (also known as a marginal platform or a single-face platform) is a platform positioned to the side of one or more railway tracks or guideways at a railway station, tram stop, or transitway. A station having dual side platforms ...
s that would be dug out from the surface. In April, Metro published the draft environmental impact statement for the tunnel project, estimating a cost of $387 million (equivalent to $ million in dollars) and a completion date of June 1989. The cost of the project drew criticism at public hearings for using a significant portion of Metro's capital budget, a total of $840 million from sales tax revenue approved by voters in 1980, as well as potential disruption to business during the cut-and-cover construction of the stations and Pine Street segment of the tunnel.
UMTA ranked Metro's bus tunnel project as first among transit projects favored to receive federal funding in 1985, despite its reliance on unproven dual-mode buses. Metro tested a prototype Renault PER 180 dual-mode trolleybus in 1983, describing it as problematic after finding it exceeded freeway axle load limits by and having to replace several parts after several mechanical failures. 98th United States Congress, Congress later appropriated $20 million to the City of Seattle for the bus tunnel project in October 1984, allowing for right-of-way acquisition to begin, but the funds were withheld until restrictions on new transit projects were lifted by the United States Senate the following May.
The Downtown Transit Project subcommittee unanimously approved Metro recommendations that would reduce the number of bus tunnel stations from six to five, saving $35 million, as well as opting for tunnel boring machines for the 3rd Avenue segment to minimize surface-level disruptions that would be present from cut-and-cover excavation. Stations would be located at Union Station south of Jackson Street, under 3rd Avenue and James Street, under 3rd Avenue and University Street, at the Westlake Mall and at 9th Avenue and Pine Street near the Washington State Convention Center. The Metro Council approved the station sites and use of tunnel-boring machines in July 1985, proceeding with final design by approving a $25.9 million contract with Parsons Brinckerhoff for engineering work related to the project.
In March 1986, the federal government offered Metro a contract committing $195 million in UMTA funding toward the bus tunnel, requiring that a decision on whether to move forward with the project be made by December 31. A month later, the King County Council asked Metro to consider delaying construction of the bus tunnel while waiting for assurance on federal funding being able to cover half of the $395 million cost of the project; the council was scheduled to begin awarding contracts for utility relocation along 3rd Avenue and Pine Street in preparation for tunnel construction. On May 15, the Presidency of Ronald Reagan, Reagan administration signed a contract with Metro to commit $197 million of the $395 million required for the bus tunnel project, assuming re-authorization of a mass transit grant program by Congress, while also extending the deadline for a final decision to September 1987. Hours later, the Metro Council awarded the first construction contract for utility relocation, with construction set to begin in July. The Metro Council accepted the UMTA contract during their June 5 meeting, allowing for bidding on tunnel construction to begin. The tunnel construction contract was awarded to the joint venture of Guy F. Atkinson Construction and Dillingham Construction in late September for $44.16 million, beating seven competing bids with an estimate far lower than the approximately $61 million predicted by Metro engineers. The contract for the dual-mode trolleybuses was awarded by the Metro Council to Breda Costruzioni Ferroviarie in October, consisting of an order for 236 buses at a cost of $133 million (equivalent to $ million in dollars); it was approved by UMTA in November.
Construction
![Breda dual-mode bus at Westlake station in Downtown Seattle Transit Tunnel, 9-17-1990](https://upload.wikimedia.org/wikipedia/commons/d/de/Breda_dual-mode_bus_at_Westlake_station_in_Downtown_Seattle_Transit_Tunnel%2C_9-17-1990.jpg)
Construction on the bus tunnel project began with partial closures of 3rd Avenue in July 1986 for utility relocation, narrowing traffic to one lane in either direction and restricting traffic to buses and emergency vehicles during rush hour. To prepare for extended periods of service disruption on 3rd Avenue, Metro Transit also moved its Trolleybuses in Seattle, electric trolleybus routes onto 1st Avenue.
Excavation of the 3rd Avenue tunnel segment began with the ceremonial launch of the "Mighty Mole", a , tunnel boring machine (TBM), on March 6, 1987.
The TBM, designed by Robbins Company of Kent, Washington, and built by Nicholson Manufacturing in Seattle, began digging the western tunnel from Union Station the following May. A second, identical "Mighty Mole" TBM began digging the parallel eastern tunnel on June 29. During tunnel boring under 3rd Avenue between Spring Street and Madison Street (Seattle), Madison Street on October 21, a small earthflow damaged a water main and caused pavement on 3rd Avenue to drop , shutting down water in the nearby Seattle City Light and 1001 Fourth Avenue Plaza buildings. While repairing the broken water main, electricians working on damaged high-voltage cables caused a small power outage that affected eight downtown buildings on the night of October 28, but were able to restore power by the following morning. Work on the western tunnel was briefly interrupted in November, when the TBM hit an unexpectedly large pocket of loose sand under Madison Street that had to be stabilized with grout to prevent damage to the adjacent Seattle City Light building. Boring on both tunnels was stopped in early January 1988, when a pocket of wet sand was encountered before the planned 90-degree turn onto Pine Street. Metro and tunnel contractors Guy F. Atkinson Construction, Atkinson/Dillingham, who had scheduled tunnel excavation for completion in mid-January, closed 3rd Avenue between Pike and Pine streets and installed 40 water well, drilled wells to remove water from the sand pocket in February. Digging resumed on the western tunnel on March 14, and the TBM reached Westlake station on April 9, completing the first of the two tunnels. The eastern tunnel was completed a month later on May 18, allowing for parts of the TBMs to be salvaged and the steel outer shells to be buried in the tunnel.
The Pine Street segment of the tunnel was planned to be dug cut-and-cover from the surface. In preparation for utility relocation work on Pine Street, Metro moved 36 bus routes serving the corridor to other east–west streets in February 1987. On April 27, excavation of the tunnel began with the closure of Pine Street, and its offramp to Interstate 5, to automobile traffic between 3rd Avenue and Boren Avenue. Workers finished digging in late August, allowing the project to progress to concrete pouring for the roadway. Pine Street was briefly re-opened for the Christmas shopping, Christmas shopping season beginning November 1 at the request of downtown merchants, with a temporary surface laid over backfill for automobiles and pedestrians. On January 4, the street was closed to automobile traffic once again, along with the intersection of 5th Avenue and Pine Street and the Pike Street offramp of I-5, to install utility lines and a permanent roadway. Pine Street was fully reopened to traffic on November 1, 1988, coinciding with the completion of
Westlake Park Westlake Park can mean:
*Westlake Park (Seattle), a park in Seattle, Washington
* MacArthur Park, formerly Westlake Park, in Los Angeles, California
*Westlake Park (Houston)
Westlake Park is a office complex located in the Energy Corridor, Housto ...
and the Westlake Center shopping mall, a year ahead of schedule.
By October 1988, Metro reported that 53% of major construction was complete and anticipated that the tunnel would be completed in May 1990 and opened for service in September 1990. Seattle Mayor Norm Rice and City Council members Paul Kraabel and George Benson recommended a limited opening of the tunnel for the 1990 Goodwill Games to be held in July, but Metro rejected the proposal so that the safety systems of the tunnel could be tested adequately before service began. Testing in the bus tunnel began with a ceremonial first run on March 15, 1989, first with a diesel bus and then one of the Breda dual-mode trolleybuses operating in diesel mode, as the overhead trolley wires had not yet been installed.
Wooden planks and steel plates covered slots in the concrete roadway where rails would be installed later.
Local media were given a tour the next day.
By January 1990, the tunnel stations were declared "nearly complete", with only minor work still left for contractors. Murals and other interactive art installations were placed in the nearly complete stations from December 1989 onward, as part of a $1.5 million arts program. Tunnel construction was finished on June 7, 1990, leaving Metro to test safety systems and train personnel for regular service to begin in September.
The initial cost of the tunnel project was estimated in 1984 to be $334.6 million, but the final costs rose 56% over budget to a total of $468.7 million (equivalent to $ in dollars); the project's cost overruns were blamed on unanticipated soil conditions on the approach to Pine Street from 3rd Avenue, complaints and payouts to downtown businesses disrupted by tunnel construction, and the death of an electrician during construction.
Excavated dirt from the project was used as fill for runway expansion at Paine Field in nearby Everett, Washington, Everett.
South African granite scandal
A minor scandal involving the bus tunnel project emerged in late 1988, over the discovery that granite to be used by Metro in the tunnel's stations had been sourced from South Africa. The Verde Fontaine granite was quarried in South Africa, which had been under Apartheid, Apartheid rule at the time, but was cut and finished in Italy, allowing for it to be approved despite the Metro Council's ongoing Disinvestment from South Africa, boycott of South African goods. The Verde Fontaine granite was selected for use as benches and interior walls in Westlake and Pioneer Square stations by architecture firm TRA; Metro was unaware that Verde Fontaine was only quarried in South Africa. The granite's origin was discovered by an activist from the Black Contractors Coalition in late 1988, who notified Metro and members of the Metro Council. Metro determined that replacing the of granite would cost $500,000 and delay both stations but would not delay the planned 1990 opening and would be covered by contingency funds in the project's budget.
During a press conference on January 25, 1989, Metro Director Alan Gibbs confirmed that the granite had been quarried in South Africa and announced that an investigative report would be delivered to the Metro Council Transit Committee the following week. The announcement was met with calls from King County Councilman Ron Sims to fire the responsible Metro officials who knowingly allowed the purchase. Metro's ban on South African goods was stricter than the federal sanctions, which only prohibited importation of specific materials such as steel, coal, uranium and agricultural products, and was used by UMTA to threaten to pull its funding for the bus tunnel project.
A report by the Metro Council Rules Committee delivered in March stated that the granite's origin was discovered in early 1988, and was authorized by tunnel superintendent David Kalberer with the assumption that only a small amount would be used to furnish
University Street station
University Street station is a light rail Metro station, station that is part of the Downtown Seattle Transit Tunnel in Seattle, Washington, United States. The station is located under 3rd Avenue at University Street, near Benaroya Hall, and i ...
.
Kalberer, who received praise for his work on the project before the scandal, admitted that the failure to consult the Metro Council's tunnel subcommittee before signing off on the deal was his mistake.
Metro Director Alan Gibbs resigned on February 23 as a result of the scandal and was succeeded by technical director Richard Sandaas in September. The granite was rejected by Metro and was returned to the supplier in Italy.
Before this discovery, in September 1987, African-American rights groups had forced tunnel contractor Atkinson/Dillingham to return 36 steel beams from South Africa used for temporary shoring at
Pioneer Square station
Pioneer Square station is a light rail station that is part of the Downtown Seattle Transit Tunnel in Seattle, Washington, United States. The station is located under 3rd Avenue at James Street, between University Street and International D ...
. This led Metro Director Alan Gibbs to propose a ban on South African materials by Metro for its projects, which was adopted by a resolution of the Metro Council on September 17.
Opening and bus-only operation
Regular service in the bus tunnel began on September 15, 1990, on five routes serving the University District, North Seattle, and Renton.
The limited service was the result of delays in the manufacturing of dual-mode buses from Breda, which were fully delivered in 1991. The opening was preceded by soft openings of each individual station, beginning with Westlake station in August 1989, and ending with Convention Place station the day before the beginning of service. A ceremonial walkathon, walk and run was held on September 9, 1990, and attracted 5,000 participants.
In its first year of operations, the bus tunnel carried 28,000 daily passengers on 688 scheduled bus trips. The tunnel reduced the number of buses operated on 3rd Avenue at peak hours from 190 to 86, with 20 Metro routes using the tunnel. ''The Seattle Times'' called it a "qualified success", commenting that the tunnel was like a "mini-subway system". The paper's editorial board also requested that Metro expand tunnel hours to keep buses running for late-night workers and entertainment events held on weekends. On December 9, 1991, the
SODO Busway
The SODO Busway, also referred to as the E-3 Busway, is a busway in the SoDo neighborhood of Seattle, Washington. It has four stops, including two that connect to Link light rail stations, and functions as an extension of the Downtown Seattl ...
opened, extending bus service from the tunnel into SODO and moving southbound routes off Interstate 5. Direct access from Interstate 90 (Washington), Interstate 90 to the bus tunnel was opened in February 1992 as part of a reversible express lane system for the Homer M. Hadley Memorial Bridge, new floating bridge.
The first use of the tunnel by Sound Transit buses began on September 18, 1999, with the takeover of Metro's Seattle–Bellevue express route, which was renumbered from 226 to 550.
To operate buses in the tunnel, Sound Transit leased 20 dual-mode buses from Metro, repainted them in the agency's colors, and contracted with Metro to operate the route along with other Sound Transit Express routes in King County.
Renovation for light rail
![Conventionplacestation3](https://upload.wikimedia.org/wikipedia/commons/3/39/Conventionplacestation3.JPG)
From the outset, the bus tunnel was intended to be converted for
light rail trains at some point in the future. Metro approved the addition of tracks to the bus tunnel in 1988, appropriating half of the $5 million used to install them during tunnel construction, the remainder coming from federal sources. To save $1.5 million in costs, Metro eliminated most of the rail's Insulator (electricity), electrical insulation, which would later render them unusable for rail service.
A regional transit authority was formed in the early 1990s to build and operate a light rail system that would use the bus tunnel within Downtown Seattle. The authority, later named
Sound Transit
Sound Transit (ST), officially the Central Puget Sound Regional Transit Authority, is a public transit agency serving the Seattle metropolitan area in the U.S. state of Washington. It operates the Link light rail system in Seattle and Tacoma, r ...
, gained voter approval in November 1996 to build a $3.9 billion system between Seattle–Tacoma International Airport, Downtown Seattle, and the University District. In 1998, Sound Transit found that the rails in the tunnel would need to be replaced at a cost of up to $110 million and require a full closure for two years. The plan would also require the purchase of new
hybrid electric bus
A hybrid electric bus is a bus that combines a conventional internal combustion engine propulsion system with an electric propulsion system. These type of buses normally use a Diesel-electric powertrain and are also known as hybrid Diesel-el ...
es to replace the Breda fleet, as the electrical systems were incompatible. Convention Place station would have to be abandoned as it was too shallow to support a northern extension under Interstate 5.
Sound Transit approved its route for the light rail project, named Central Link (now the 1 Line), in November 1999, including four of the five stations in the downtown transit tunnel (excluding Convention Place). King County Executive Ron Sims proposed transferring ownership of the tunnel, along with $130 million in debt and liabilities for maintenance and operations, from King County Metro to Sound Transit in 2004. The two agencies signed an agreement in May 2000 that formally transferred ownership and responsibility for the tunnel to Sound Transit, in exchange for $195.6 million paid to King County Metro. Metro would retain ownership of Convention Place station and other assets, while Sound Transit would convert the tunnel to rail operation after 2004.
Sound Transit underwent a funding crisis in 2001 after the Central Link light rail project was found to be over budget and would not be able to open until 2009, three years later than planned. The light rail project was truncated to Westlake station in Downtown Seattle and to Tukwila, Washington, Tukwila, the sections north of downtown and south to the airport being deferred to a later date. The King County Council called for a new agreement to be negotiated with Sound Transit adding requirements for an adopted plan for light rail service to Northgate, and for a study into new riders that light rail would bring to the tunnel over a conventional bus network. In early 2002, Sound Transit also explored, and ultimately rejected, a proposal to build a parallel, rail-only tunnel under 5th Avenue that would cost $1 billion.
Sound Transit and the King County Council signed a new joint-operations agreement in June 2002, leaving King County Metro as owners of the tunnel and Sound Transit responsible for paying part of the tunnel's debt service at an estimated cost of $65 million. The agreement would allow for buses and light rail trains to share the tunnel and its stations beginning in 2009, after a two-year closure for renovations. A separate agreement signed in May 2003 selected King County Metro as the operator of the light rail line.
Metro began testing a fleet of new hybrid diesel-electric buses in 2002, intending to use them in the bus tunnel before and after the conversion to joint bus-rail operations. The first few of a planned fleet of 235 hybrid diesel-electric
articulated buses began operating on tunnel bus routes in June 2004. The Breda dual-mode trolleybuses were removed from the tunnel in January 2005 and would later be refurbished into electric-only trolleybuses for use on the city's trolleybus network.
The last day of trolleybus operation in the tunnel was January 24, 2005, with only a single dual-mode bus in service on the final day.
In February 2004, Sound Transit announced that it would begin the closure and renovation of the bus tunnel in September 2005, two years earlier than scheduled, to save money and reduce construction delays. Construction of a stub tunnel under Pine Street near Convention Place station, to be used for light rail train storage and turnback, as well as a future extension to Capitol Hill, began in January 2005. The bus tunnel was closed on September 24, 2005, moving the tunnel's 21 routes and 140 buses per hour to surface streets.
3rd Avenue was converted to a "transit-priority corridor" during peak periods, restricting general traffic to one-block travel.
The $82.7 million construction contract for the transit tunnel renovation was awarded to Balfour Beatty in August 2004, 12 percent below Sound Transit's estimates. The majority of the cost was paid by Sound Transit and supplemented by $8.1 million from King County Metro.
As part of the renovations, the tunnel's roadway was lowered by to allow for level boarding, required by the Americans with Disabilities Act; as a result, Metro added strobe lights to bus mirrors, which were lowered to head height, and added warning signs. New electrical, mechanical, and emergency systems were installed, along with a new communications system connecting to a joint-operations center.
The project ended up costing $94 million in total, 3.4 percent over the budget set in 2004. During the closure, Metro found that average travel time through downtown increased only 11 percent during the afternoon peak period, and ridership on popular routes only dropped slightly.
Joint bus and train operations
The tunnel reopened to service on September 24, 2007, with tunnel routes modified to group common destinations together. Initially, the reopened tunnel was in use only on weekdays, with Saturday operation not yet reinstated. Stations were given new entrance signs, lighting fixtures, electronic passenger information system, passenger information signs, and restored paint. The peak bus-only restrictions on 3rd Avenue remained in place after the reopening, along with the skip-stop service that Metro implemented on the street. The tunnel was temporarily closed for nine days in December after a computer glitch disrupted the tunnel's new emergency-control system, which was repaired and replaced. The tunnel had remained closed on weekends after its reopening, but Saturday operation was reinstated and Sunday operation was introduced in May 2009.
Simulated light rail testing in the tunnel also began on May 20, 2009, with two-car trains operating alongside in-service buses, making it the first joint bus and rail tunnel with stations in the United States; the
Mount Washington Transit Tunnel
Mount Washington Transit Tunnel is an important public transportation link in Pittsburgh, Pennsylvania, United States. The Middleton, William D. (1967). ''The Time of the Trolley'', p. 195. Milwaukee, WI (US): Kalmbach Publishing Co. LCCN 67-201 ...
, a joint bus and rail tunnel in Pittsburgh, Pennsylvania, had already been in operation but lacked underground stations. Service on the Central Link light rail line began on July 18, 2009, operating from Westlake station in the tunnel to Tukwila International Boulevard station near the airport. Light rail service was extended north from Westlake to University of Washington station (via
Capitol Hill station
Capitol Hill station is a light rail station in the Capitol Hill neighborhood of Seattle, Washington, United States. The station is served by Sound Transit's Link light rail system and is located near the intersection of Broadway and East Jo ...
) on March 19, 2016, coinciding with the moving of several bus routes out of the tunnel to accommodate increased train frequencies. The ramp from International District/Chinatown station to the Interstate 90 express lanes was closed in September 2018 as part of preparations for East Link construction.
End of bus service
In November 2015, King County Metro signed a $147 million agreement to sell Convention Place station to the Washington State Convention Center for redevelopment. The convention center plans to build a new expansion on the property, necessitating the closure of the station and transit tunnel to buses earlier than planned. In 2017, Sound Transit and the Seattle Department of Transportation announced that the tunnel would become rail-only in 2019, two years sooner than the planned switch in 2021 to coincide with the opening of the Northgate Link Extension. Convention Place station was permanently closed on July 21, 2018, and was replaced with a set of bus stops on 9th Avenue and a new tunnel access ramp.
Bus service in the tunnel ended on March 23, 2019, with a ceremonial trip by a preserved Breda dual-mode bus at 1 a.m. The remaining 830 bus trips through the tunnel, serving approximately 37,000 riders on seven routes, were redirected onto surface corridors on 2nd, 3rd, 4th, 5th, and 6th avenues. Metro and the city government also increased surface street capacity for buses by introducing all-door boarding for all 3rd Avenue and Westlake Avenue routes at 31 stops, improving signal timing, and adding a new northbound bus lane on 5th and 6th avenues.
During early 2020, Sound Transit built connections to East Link at International District/Chinatown station. Over a ten-week period that began in January 2020, four-car trains ran on a single track within the tunnel, with through-passengers transferring at Pioneer Square station via a temporary center platform, reducing frequency to 13–15 minutes. The tunnel was also closed for four weekends until work was completed in late March, after a week-long delay in testing. Frequency restrictions brought on by the project remained due to the 2020 coronavirus pandemic in Washington (state), coronavirus pandemic and local shutdowns.
Sound Transit originally planned to assume full ownership of the tunnel in 2020, but later delayed plans due to the COVID-19 pandemic and issues with station escalators. The 36 escalators serving the downtown tunnel stations, which suffered from breakdowns and lengthy repairs, are planned to be repaired under a new contractor to replace Kone. The transfer was approved by Sound Transit on October 27, 2022, at no cost due to an agreement with Metro to pay off $87 million of remaining debt incurred from its construction. As part of the transfer, $96 million has been budgeted for upgrades to elevators and escalators, fixing utilities and station elements, and cleaning soiled artwork. In September 2022, ORCA card readers were removed from the platforms and new signage and tactile markings added for fare paid zones.
References
External links
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King County Metro: Downtown Seattle Transit Tunnel
{{Puget Sound Transit, show
1990 establishments in Washington (state)
Bus rapid transit in Washington (state)
Busways
Link light rail
Railroad tunnels in Seattle
Sound Transit Express
Trolleybus transport in the United States
Tunnels completed in 1990
Underground rapid transit in the United States
1500 V DC railway electrification