Dumbarton Bridge (California)
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The Dumbarton Bridge is the southernmost of the highway bridges across
San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from a ...
in
California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...
. Carrying over 70,000 vehicles and about 118 pedestrian and bicycle crossings daily (384 on weekends), it is the shortest bridge across San Francisco Bay at . Its eastern end is in Fremont, near
Newark Newark most commonly refers to: * Newark, New Jersey, city in the United States * Newark Liberty International Airport, New Jersey; a major air hub in the New York metropolitan area Newark may also refer to: Places Canada * Niagara-on-the ...
in the
San Francisco Bay National Wildlife Refuge Don Edwards San Francisco Bay National Wildlife Refuge (DESFBNWR) is a United States National Wildlife Refuge located in the southern part of San Francisco Bay, California. The Refuge headquarters and visitor center is located in the Baylands di ...
, and its western end is in Menlo Park. Bridging State Route 84 across the bay, it has three lanes each way and a separated bike/pedestrian lane along its south side. Like the San Mateo Bridge to the north,
power line An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy across large distances. It consists of one or more uninsulated electrical cables (commonly multiples of three for three-p ...
s parallel the bridge.


History and engineering features

The bridge has never been officially named, but its commonly used name comes from Dumbarton Point, named in 1876 after
Dumbarton, Scotland Dumbarton (; also sco, Dumbairton; ) is a town in West Dunbartonshire, Scotland, on the north bank of the River Clyde where the River Leven flows into the Clyde estuary. In 2006, it had an estimated population of 19,990. Dumbarton was the ca ...
. Built originally to provide a shortcut for traffic originating in San Mateo and Santa Clara counties, the bridge served industrial and residential areas on both sides. The earlier bridge opened on January 17, 1927, and was the first vehicular bridge to cross San Francisco Bay. A portion of this old drawbridge remains as a fishing pier on the east side of the Bay. The original bridge was built with private capital and then purchased by the state for $2.5 million in 1951. Its age, and the two-lane undivided roadway and lift-span, led to a replacement bridge being built to the north. This bridge opened in October 1982 as a four-lane, high-level structure. The structure was re-striped to accommodate six lanes on October 18, 1989, in response to the temporary closing of the
San Francisco–Oakland Bay Bridge The San Francisco–Oakland Bay Bridge, known locally as the Bay Bridge, is a complex of bridges spanning San Francisco Bay in California. As part of Interstate 80 in California, Interstate 80 and the direct road between San Francisco and Oakland ...
due to the
Loma Prieta earthquake The 1989 Loma Prieta earthquake occurred on California's Central Coast on October 17 at local time. The shock was centered in The Forest of Nisene Marks State Park in Santa Cruz County, approximately northeast of Santa Cruz on a section of t ...
, and the permanent widening of the approaches was completed by July 2003. The cost of the complete replacement project was $200 million. The current bridge includes a two-way bicycle and separate pedestrian path on the south-facing side. A center span provides of vertical clearance for shipping. The approach spans on both sides of the Bay are of pre-stressed
lightweight concrete Autoclaved aerated concrete (AAC) is a lightweight, precast, foam concrete building material suitable for producing concrete masonry unit like blocks. Composed of quartz sand (SiO2 with impurities), calcined calcium sulfate (CaSO4, a.k.a ...
girder A girder () is a support beam used in construction. It is the main horizontal support of a structure which supports smaller beams. Girders often have an I-beam cross section composed of two load-bearing ''flanges'' separated by a stabilizing ' ...
s supporting a lightweight concrete deck. The center spans are twin steel trapezoidal girders which also support a lightweight concrete deck. The center span of the original bridge was demolished in a controlled explosion in September 1984.


Roadway connections

The bridge is part of State Route 84, and is directly connected to Interstate 880 by a
freeway A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway and expressway. Other similar terms ...
segment north of the Fremont end. There is no freeway connection between
U.S. 101 U.S. Route 101, or U.S. Highway 101 (US 101), is a north–south United States Numbered Highway that runs through the states of California, Oregon, and Washington, on the West Coast of the United States. It is also known as (The Royal Roa ...
and the southwest end of the Dumbarton Bridge. Motorists must traverse one of three at-grade routes to connect from the Bayshore Freeway to the bridge. These are (from northwest to southeast): # the Bayfront Expressway, a
limited-access road A limited-access road, known by various terms worldwide, including limited-access highway, dual-carriageway, expressway, limited access freeway, and partial controlled access highway, is a highway or arterial road for high-speed traffic which ...
linking to U.S. 101 at Marsh Road, Atherton (the official routing of SR 84) # Willow Road ( SR 114), an approximately one-mile expressway through east Menlo Park to U.S. 101 # University Avenue ( SR 109), an
arterial road An arterial road or arterial thoroughfare is a high-capacity urban road that sits below freeways/motorways on the road hierarchy in terms of traffic flow and speed. The primary function of an arterial road is to deliver traffic from collector ro ...
and the main commercial street of
East Palo Alto East Palo Alto (abbreviated E.P.A.) is a city in San Mateo County, California, United States. As of the 2020 census, the population of East Palo Alto was 30,034. It is situated on the San Francisco Peninsula, roughly halfway between the cities of ...
. The Willow Road and University Avenue junctions with Bayfront Expressway are at-grade intersections controlled by traffic lights; there are two additional controlled intersections at Chilco Road and Marsh Road, and the Marsh Road interchange on U.S. 101 is a
parclo A partial cloverleaf interchange or parclo is a modification of a cloverleaf interchange. The design has been well received, and has since become one of the most popular freeway-to-arterial interchange designs in North America. It has also bee ...
. The result is that Bayfront Expressway is frequently congested, and when not congested is often the site of high-speed car crashes. In 2007, prominent author
David Halberstam David Halberstam (April 10, 1934 April 23, 2007) was an American writer, journalist, and historian, known for his work on the Vietnam War, politics, history, the Civil Rights Movement, business, media, American culture, Korean War, and later ...
was killed in one such crash at the Willow Road intersection. Access to
I-280 Interstate 280 may refer to multiple highways, all of which are or were related to Interstate 80: * Interstate 280 (California), a north–south freeway running from San Jose to San Francisco * Interstate 280 (Iowa–Illinois), part of the beltway ...
is available via State Route 84 to Woodside Road (as signed) or other arterial routes. There are no cross-Peninsula freeway connections between State Routes 92 and 84. In addition, there are no direct cross-Peninsula arterial routes between State Route 84 and Page Mill Road, a five-mile gap. Although the present situation has resulted in severe traffic problems on the bridge itself and in Menlo Park and East Palo Alto, Caltrans has been unable to upgrade the relevant portion of Highway 84 to freeway standards for several decades, due to opposition from the cities of Menlo Park, Atherton and
Palo Alto Palo Alto (; Spanish for "tall stick") is a charter city in the northwestern corner of Santa Clara County, California, United States, in the San Francisco Bay Area, named after a coastal redwood tree known as El Palo Alto. The city was estab ...
. Freeway opponents fear that upgrading Highway 84 will encourage more people to live in southern
Alameda County Alameda County ( ) is a List of counties in California, county located in the U.S. state of California. As of the 2020 United States Census, 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and List ...
(where housing is more affordable) and commute to jobs in the mid-Peninsula area (where businesses wish to be located in order to be close to
Silicon Valley Silicon Valley is a region in Northern California that serves as a global center for high technology and innovation. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical areas San Mateo County ...
), thus increasing traffic in their neighborhoods to the south and west of U.S. 101 and even along State Routes 85 and 237. Bus service across the bridge is provided by the
Dumbarton Express Dumbarton Express is a regional public transit service in the San Francisco Bay Area connecting Alameda, San Mateo, and Santa Clara Counties via the Dumbarton Bridge, the system's namesake. The bus service is funded by a consortium of five tra ...
, run by a consortium of local transit agencies (
SamTrans SamTrans (stylized as samTrans; officially the San Mateo County Transit District) is a public transport agency in and around San Mateo, California, in the San Francisco Bay Area. It provides bus service throughout San Mateo County and into porti ...
,
AC Transit AC Transit (Alameda-Contra Costa Transit District) is an Oakland-based public transit agency serving the western portions of Alameda and Contra Costa counties in the East Bay of the San Francisco Bay Area. AC Transit also operates "Transbay" ro ...
, VTA and others) which connects to
BART Bart is a masculine given name, usually a diminutive of Bartholomew, sometimes of Barton, Bartolomeo, etc. Bart is a Dutch and Ashkenazi Jewish surname, and derives from the name ''Bartholomäus'', a German form of the biblical name ''Barthol ...
at Union City and
Caltrain Caltrain (reporting mark JPBX) is a California commuter rail line serving the San Francisco Peninsula and Santa Clara Valley (Silicon Valley). The southern terminus is in San Jose at Tamien station with weekday rush hour service running as far ...
at Palo Alto and California Avenue. AC Transit also runs Transbay buses U ( Fremont BART and
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 ...
to
Stanford Stanford University, officially Leland Stanford Junior University, is a private research university in Stanford, California. The campus occupies , among the largest in the United States, and enrolls over 17,000 students. Stanford is considere ...
) and DA (Ardenwood to
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and
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headquarters) across the bridge. The free Stanford Marguerite Shuttle also runs buses AE-F and EB across the bridge.


Environmental factors

When the current bridge was planned in the 1970s,
Caltrans The California Department of Transportation (Caltrans) is an Executive (government), executive department of the U.S. state of California. The department is part of the Government of California#State agencies, cabinet-level California State Tran ...
conducted extensive environmental research on the aquatic and
terrestrial Terrestrial refers to things related to land or the planet Earth. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on or near the ground, as opposed to ...
environment. Principal concerns of the public were
air pollution Air pollution is the contamination of air due to the presence of substances in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. There are many different types ...
and
noise pollution Noise pollution, also known as environmental noise or sound pollution, is the propagation of noise with ranging impacts on the activity of human or animal life, most of them are harmful to a degree. The source of outdoor noise worldwide is main ...
impacts, particularly in some residential areas of Menlo Park and
East Palo Alto East Palo Alto (abbreviated E.P.A.) is a city in San Mateo County, California, United States. As of the 2020 census, the population of East Palo Alto was 30,034. It is situated on the San Francisco Peninsula, roughly halfway between the cities of ...
. Studies were conducted to produce contour maps of projected sound levels and
carbon monoxide Carbon monoxide (chemical formula CO) is a colorless, poisonous, odorless, tasteless, flammable gas that is slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simple ...
concentrations throughout the western approaches, for each alternative connection scheme. The area around the bridge is an important ecological area, hosting many species of birds, fish and mammals. The
endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inv ...
California clapper rail Ridgway's rail (''Rallus obsoletus'') is a near-threatened species of bird. It is found principally in California's San Francisco Bay to southern Baja California. A member of the rail family, Rallidae, it is a chicken-sized bird that rarely flie ...
is known to be present in the western bridge terminus area. Near the bridge on the Peninsula are Menlo Park's Bayfront Park, East Palo Alto's Ravenswood Open Space Preserve, and the
Palo Alto Baylands Nature Preserve The Palo Alto Baylands Nature Preserve, known officially as the Baylands Nature Preserve, is the largest tract of undisturbed marshland remaining in the San Francisco Bay. Fifteen miles of multi-use trails provide access to a unique mixture of t ...
. An accessible portion of the
San Francisco Bay National Wildlife Don Edwards San Francisco Bay National Wildlife Refuge (DESFBNWR) is a United States National Wildlife Refuge located in the southern part of San Francisco Bay, California. The Refuge headquarters and visitor center is located in the Baylands dist ...
Refuge lies immediately north of the western bridge terminus, where the Ravenswood trail runs. On both sides of the east end of the bridge are large salt ponds and
levee A levee (), dike (American English), dyke (English in the Commonwealth of Nations, Commonwealth English), embankment, floodbank, or stop bank is a structure that is usually soil, earthen and that often runs parallel (geometry), parallel to ...
trails belonging to the
Don Edwards San Francisco Bay National Wildlife Refuge Don Edwards San Francisco Bay National Wildlife Refuge (DESFBNWR) is a United States National Wildlife Refuge located in the southern part of San Francisco Bay, California. The Refuge headquarters and visitor center is located in the Baylands dis ...
. The headquarters and visitor center for the refuge is on a hill south of the bridge approach. North of the east end of the bridge is
Coyote Hills Regional Park Coyote Hills Regional Park is a regional park encompassing nearly 978 acres of land and administered by the East Bay Regional Park District. The park, which was dedicated to public use in 1967, is located in Fremont, California, USA, on the sou ...
, with its network of trails running over tall hills. North of that is the
Alameda Creek Regional Trail , name_etymology = Spanish , image = Bridgeatnilesrivercalifornia.JPG , image_caption = Alameda Creek at Niles, Fremont , map = , map_size = , map_caption = , pushpin_map = US ...
from the Bay to
Niles Canyon Niles Canyon is a canyon in the San Francisco Bay Area formed by Alameda Creek, known for its heritage railroad and silent movie history. The canyon is largely in an unincorporated area of Alameda County, while the western portion of the canyo ...
. East of Coyote Hills is
Ardenwood Historic Farm Ardenwood Historic Farm is a Regional Historic Landmark in Fremont, California. It is managed by the East Bay Regional Park District. The Ardenwood Historic Farm consists of the Ardenwood Station, the former Ohlone village and burial site, a bla ...
, a restored working farm that preserves and displays turn-of-the-century farming methods


Tolls

Tolls are only collected from westbound traffic at the toll plaza on the east side of the bay.
All-electronic tolling Open road tolling (ORT), also called all-electronic tolling, cashless tolling, or free-flow tolling, is the collection of tolls on toll roads without the use of toll booths. An electronic toll collection system is usually used instead. The ma ...
has been in effect since 2020, and drivers may either pay using the
FasTrak FasTrak is the electronic toll collection (ETC) system used in the state of California in the United States. The system is used statewide on all of the toll roads, toll bridges, and high-occupancy toll lanes along the California Freeway and E ...
electronic toll collection device, using the license plate tolling program, or via a one time payment online. Effective , the toll rate for passenger cars is $7. During peak traffic hours,
carpool Carpooling (also car-sharing, ride-sharing and lift-sharing) is the sharing of car journeys so that more than one person travels in a car, and prevents the need for others to have to drive to a location themselves. By having more people usi ...
vehicles carrying three or more people, clean air vehicles, or motorcycles may pay a discounted toll of $3.50 if they have FasTrak and use the designated carpool lane. Drivers must pay within 48 hours after crossing the bridge or they will be sent a toll violation invoice. No additional fees will be added to the toll violation if it is paid within 21 days.


Historical toll rates

Prior to 1969, tolls on the Dumbarton Bridge were collected in both directions. When it opened, the original 1927 span had a toll of $0.40 per car plus $0.05 per passenger. In 1959, tolls were set to $0.35 per car. It was raised to $0.70 in 1969, then $0.75 in 1976. The toll per car remained at $0.75 when the replacement bridge opened in the 1980s. The basic toll (for automobiles) on the seven state-owned bridges, including the Dumbarton Bridge, was raised to $1 by Regional Measure 1, approved by Bay Area voters in 1988. A $1 seismic retrofit surcharge was added in 1998 by the state legislature, originally for eight years, but since then extended to December 2037 (AB1171, October 2001). On March 2, 2004, voters approved Regional Measure 2, raising the toll by another dollar to a total of $3. An additional dollar was added to the toll starting January 1, 2007, to cover cost overruns concerning the replacement of the eastern span. The Metropolitan Transportation Commission, a regional transportation agency, in its capacity as the
Bay Area Toll Authority The Bay Area Toll Authority (BATA) is a state agency created by the California State Legislature in 1997 to administer the auto tolls on the San Francisco Bay Area's seven state-owned toll bridges. On January 1, 1998, the Metropolitan Transporta ...
, administers RM1 and RM2 funds, a significant portion of which are allocated to public transit capital improvements and operating subsidies in the transportation corridors served by the bridges. Caltrans administers the "second dollar" seismic surcharge, and receives some of the MTC-administered funds to perform other maintenance work on the bridges. The Bay Area Toll Authority is made up of appointed officials put in place by various city and county governments, and is not subject to direct voter oversight. Due to further funding shortages for seismic retrofit projects, the Bay Area Toll Authority again raised tolls on all seven of the state-owned bridges in July 2010. The toll rate for autos on the Dumbarton Bridge was thus increased to $5. In June 2018, Bay Area voters approved Regional Measure 3 to further raise the tolls on all seven of the state-owned bridges to fund $4.5 billion worth of transportation improvements in the area. Under the passed measure, the toll rate for autos on the Dumbarton Bridge was increased to $6 on January 1, 2019 and to $7 on January 1, 2022, and the toll rate will increase again to $8 on January 1, 2025. In September 2019, the MTC approved a $4 million plan to eliminate toll takers and convert all seven of the state-owned bridges to
all-electronic tolling Open road tolling (ORT), also called all-electronic tolling, cashless tolling, or free-flow tolling, is the collection of tolls on toll roads without the use of toll booths. An electronic toll collection system is usually used instead. The ma ...
, citing that 80 percent of drivers are now using Fastrak and the change would improve traffic flow. On March 20, 2020, accelerated by the
COVID-19 pandemic The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing global pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The novel virus was first identif ...
, all-electronic tolling was placed in effect for all seven state-owned toll bridges. The MTC then installed new systems at all seven bridges to make them permanently cashless by the start of 2021. In April 2022, the Bay Area Toll Authority announced plans to remove all remaining unused toll booths and create an open-road tolling system which functions at highway speeds.


Dumbarton Rail Bridge

Just to the south of the car bridge lies the Dumbarton Rail Bridge. Built in 1910, the rail bridge has been unused since 1982 and its western approach collapsed in a fire in 1998. When the bridge was in use, boaters would signal the operator, who would start a diesel engine and rotate the bridge to the open position on a large gear. The bridge is now left in the open position as shown. There are plans for a new rail bridge and rehabilitation of the rail line to serve a commuter rail service to connect Union City, Fremont, and Newark to various
Peninsula A peninsula (; ) is a landform that extends from a mainland and is surrounded by water on most, but not all of its borders. A peninsula is also sometimes defined as a piece of land bordered by water on three of its sides. Peninsulas exist on all ...
destinations. A successful March 2004 regional transportation ballot measure included funding to rehabilitate the rail bridge for the commuter rail service, but in October 2008 the Metropolitan Transportation Commission transferred $91 million from this project to the
BART Bart is a masculine given name, usually a diminutive of Bartholomew, sometimes of Barton, Bartolomeo, etc. Bart is a Dutch and Ashkenazi Jewish surname, and derives from the name ''Bartholomäus'', a German form of the biblical name ''Barthol ...
Warm Springs extension in Fremont.


Hetch Hetchy Aqueduct

Between the Dumbarton Bridge and the Dumbarton Rail Bridge is the Bay crossing of the
Hetch Hetchy Aqueduct Hetch Hetchy is a valley, a reservoir, and a water system in California in the United States. The glacial Hetch Hetchy Valley lies in the northwestern part of Yosemite National Park and is drained by the Tuolumne River. For thousands of years bef ...
. The aqueduct rises above ground in Newark at the east side of the Bay, falls below the water's surface at a pump station in Fremont, re-emerges in the middle of the Bay and then continues above water until it reaches the west side of the Bay at Menlo Park.


In popular culture

A scene of the 1971 movie ''
Harold and Maude ''Harold and Maude'' is a 1971 American romantic black comedy–drama film directed by Hal Ashby and released by Paramount Pictures. It incorporates elements of dark humor and existentialist drama. The plot follows the exploits of Harold Chasen ...
'' was filmed at the original toll plaza and showed Maude speeding and disobeying a police officer.


References


External links


Bay Area FasTrak
– includes toll information on this and the other Bay Area toll facilities
California Dept. of Transportation: Dumbarton Bridge


* {{Crossings navbox , structure = Crossings , place =
San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from a ...
, bridge = Dumbarton Bridge , bridge signs = , upstream text = South , upstream =
Hetch Hetchy Hetch Hetchy is a valley, a reservoir, and a water system in California in the United States. The glacial Hetch Hetchy Valley lies in the northwestern part of Yosemite National Park and is drained by the Tuolumne River. For thousands of years bef ...
Aqueduct , upstream signs = , downstream text = North , downstream = San Mateo-Hayward Bridge , downstream signs = Bridges in the San Francisco Bay Area Road bridges in California Bridges in Alameda County, California Bridges in San Mateo County, California Concrete bridges in California Swing bridges in the United States Toll bridges in California Bridges completed in 1927 Bridges completed in 1982 Buildings and structures in Fremont, California Menlo Park, California San Francisco Bay San Francisco Bay Trail 1927 establishments in California Girder bridges in the United States