List of Interstate Highways in Washington
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The Interstate Highways in Washington are segments of the national
Interstate Highway System The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. Th ...
that lie within the U.S. state of
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 ...
. The system comprises on seven routes that are owned and maintained by the
Washington State Department of Transportation The Washington State Department of Transportation (WSDOT or WashDOT, both ) is a governmental agency that constructs, maintains, and regulates the use of transportation infrastructure in the U.S. state of Washington (state), Washington. Establi ...
(WSDOT); the design standards and numbering across the national system are managed by the
Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
(FHWA) and the
American Association of State Highway and Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test quality control, protocols, and guidelines that are used in highway design and construction through ...
(AASHTO). Washington has three primary Interstates and four
auxiliary routes 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 In ...
; the seven routes serve most of the state's major cities. The longest of these is
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 ...
(I-90), which is long and connects the state's two largest cities,
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 ...
and
Spokane Spokane ( ) is the largest city and county seat of Spokane County, Washington, United States. It is in eastern Washington, along the Spokane River, adjacent to the Selkirk Mountains, and west of the Rocky Mountain foothills, south of the Ca ...
.
I-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 ...
is the only Interstate to span the state from south to north, traveling from the
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
state line to the
Canadian border Canadians (french: Canadiens) are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of ...
. The system also includes several
business routes A business route (or business loop, business spur, or city route) in the United States is a short special route connected to a ''parent'' numbered highway at its beginning, then routed through the central business district of a nearby city or ...
that are not maintained or managed by WSDOT, but rather by local governments. The general plan and federal funding for the Interstate Highway System were approved by the
U.S. Congress The United States Congress is the legislature of the federal government of the United States. It is Bicameralism, bicameral, composed of a lower body, the United States House of Representatives, House of Representatives, and an upper body, ...
in the
Federal-Aid Highway Act of 1956 The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, was enacted on June 29, 1956, when President Dwight D. Eisenhower signed the bill into law. With an original authorization of $25 billion for ...
. The federal plan incorporated elements of the Washington state government's plan for limited access highways, including an urban
tollway A toll road, also known as a turnpike or tollway, is a public or private road (almost always a controlled-access highway in the present day) for which a fee (or ''toll'') is assessed for passage. It is a form of road pricing typically implemented ...
that was later cancelled. The original allocation of two primary routes and two auxiliary routes was later expanded in the 1960s and 1970s with the addition of I-82 and two more auxiliary routes. The last segment of the Interstate Highway System in Washington, a section of I-90 between Seattle 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 ...
, was completed in 1993. An eighth route, popularly named
I-605 Interstate 605 (abbreviated I-605, officially known as the San Gabriel River Freeway) is a major north–south auxiliary Interstate Highway in the Greater Los Angeles urban area of Southern California. It runs from I-405 and State Route& ...
, has been proposed in several forms since the 1960s but was never submitted for formal approval.


Description

All seven Interstate Highways in Washington are legally defined as part of the state highway system, which is maintained and administered by WSDOT. They are all
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 ...
s built to
Interstate Highway standards Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway to ...
, which require full
grade separation In civil engineering (more specifically highway engineering), grade separation is a method of aligning a junction of two or more surface transport axes at different heights (grades) so that they will not disrupt the traffic flow on other tran ...
and
control of access 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 i ...
via
interchanges Interchange may refer to: Transport * Interchange (road), a collection of ramps, exits, and entrances between two or more highways * Interchange (freight rail), the transfer of freight cars between railroad companies * Interchange station, a rai ...
, design speeds of , a minimum of two lanes per direction, and widths of at least for lanes and for the left and right
shoulders The human shoulder is made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) as well as associated muscles, ligaments and tendons. The articulations between the bones of the shoulder mak ...
, respectively. The FHWA is responsible for overseeing these standards and can also approve exceptions. The
numbering scheme There are many different numbering schemes for assigning nominal numbers to entities. These generally require an agreed set of rules, or a central coordinator. The schemes can be considered to be examples of a primary key of a database management ...
used to designate the Interstates was developed by AASHTO, an organization composed of the various state departments of transportation in the United States. A set of
business routes A business route (or business loop, business spur, or city route) in the United States is a short special route connected to a ''parent'' numbered highway at its beginning, then routed through the central business district of a nearby city or ...
, which use a modified green Interstate shield, are designated and maintained by local governments instead of WSDOT and do not require approval from the FHWA. The Interstate Highway System covers about in Washington and consists of three primary routes and four
auxiliary routes 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 In ...
. They connect the major cities and metropolitan areas of the state, working in concert with the
U.S. routes The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these h ...
and state routes also maintained by WSDOT. The longest route,
I-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 ...
, is and connects the state's two largest cities,
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 ...
and
Spokane Spokane ( ) is the largest city and county seat of Spokane County, Washington, United States. It is in eastern Washington, along the Spokane River, adjacent to the Selkirk Mountains, and west of the Rocky Mountain foothills, south of the Ca ...
; the shortest is I-705 at . The widest section in the state is on
I-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 ...
in
Downtown Seattle Downtown is the central business district of Seattle, Washington. It is fairly compact compared with other city centers on the U.S. West Coast due to its geographical situation, being hemmed in on the north and east by hills, on the west by ...
, which spans 13 lanes and includes a set of reversible express lanes that change direction depending on time of the day. Various sections of the Interstate Highways serving the
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 ...
and Portland–Vancouver metropolitan areas also have designated lanes for high-occupancy vehicles, buses, and tolled vehicles. The Seattle–Tacoma area ranks third among U.S. metropolitan areas for the number of sections with high-occupancy vehicle lanes. In 2019, Washington's Interstates carried an estimated 17.4 billion
vehicle miles traveled The units of measurement in transportation describes the unit of measurement used to express various transportation quantities, as used in statistics, planning, and their related applications. Transportation quantity The currently popular units ...
, comprising 28 percent of all travel on roads in the state.


History

Early proposals for a national system of "superhighways" with
limited access 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 ...
and grade separation emerged in the 1930s at the behest of the
Bureau of Public Roads The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
(BPR; now the FHWA) under the Roosevelt administration. A 1939 BPR report evaluated national corridors for tolled superhighways, including a north–south route on the
West Coast West Coast or west coast may refer to: Geography Australia * Western Australia *Regions of South Australia#Weather forecasting, West Coast of South Australia * West Coast, Tasmania **West Coast Range, mountain range in the region Canada * Britis ...
terminating at the Canadian border in Washington and an east–west route originating in Seattle to connect the Northern states. The first major
expressway Expressway may refer to: * Controlled-access highway, the highest-grade type of highway with access ramps, lane markings, etc., for high-speed traffic. * Limited-access road, a lower grade of highway or arterial road. *Expressway, the fictional s ...
with limited access to be built in the state was the
Alaskan Way Viaduct The Alaskan Way Viaduct ("the viaduct" for short) was an elevated freeway in Seattle, Washington, United States, that carried a section of State Route 99 (SR 99). The double-decked freeway ran north–south along the city's waterfront for , ...
in Downtown Seattle, which was announced in 1947 and used federal grants authorized by the
Federal-Aid Highway Act of 1944 The Federal-Aid Highway Act of 1944 (; ) is legislation enacted by the United States Congress and signed into law on December 20, 1944, which established a 50–50 formula for subsidizing the construction of national highways and secondary (or "fe ...
. It opened in 1953 and replaced sections of U.S. Route 99 (US 99), part of the older
United States Numbered Highway System The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these hi ...
. The
Washington State Legislature The Washington State Legislature is the state legislature of the U.S. state of Washington. It is a bicameral body, composed of the lower Washington House of Representatives, composed of 98 Representatives, and the upper Washington State Senat ...
approved their own plans for a system of limited-access highways in 1947, in response to rising collisions and hazardous conditions on existing state roadways. The legislation authorized planning for a tolled superhighway between Seattle and Tacoma that would later be extended south to
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
and north to
British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...
as a replacement for US 99. A second bill in 1951 authorized the construction of expressways to replace rural sections of US 99 and US 10 (the east–west trunk), particularly by bypassing small cities, and the program was expanded to cover by 1953. In addition to the inter-regional superhighways planned in the 1930s and 1940s, the BPR also surveyed potential urban routes and bypasses that would perform auxiliary functions. These included bypasses of Seattle and
Portland, Oregon Portland (, ) is a port city in the Pacific Northwest and the largest city in the U.S. state of Oregon. Situated at the confluence of the Willamette and Columbia rivers, Portland is the county seat of Multnomah County, the most populous co ...
, the latter of which would also encompass
Vancouver, Washington Vancouver is a city on the north bank of the Columbia River in the U.S. state of Washington, located in Clark County. Incorporated in 1857, Vancouver has a population of 190,915 as of the 2020 census, making it the fourth-largest city in Was ...
. The
Federal-Aid Highway Act of 1956 The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, was enacted on June 29, 1956, when President Dwight D. Eisenhower signed the bill into law. With an original authorization of $25 billion for ...
, signed into law by President
Dwight D. Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; ; October 14, 1890 – March 28, 1969) was an American military officer and statesman who served as the 34th president of the United States from 1953 to 1961. During World War II, ...
on June 29, 1956, formally authorized the creation of the Interstate Highway System and its design standards. It also established a federal commitment to fund 90 percent of construction costs for eligible Interstate projects. In August 1957, the American Association of State Highway Officials (AASHO; now AASHTO) designated the state's two primary routes as I-5 and I-90, replacing US 99 and US 10, respectively. A pair of auxiliary routes were also included in the original Washington allocation and numbered in 1958: I-205, bypassing Portland and Vancouver; and I-405, bypassing Seattle. Washington's third primary route, connecting
Ellensburg Ellensburg is a city in and the county seat of Kittitas County, Washington, United States. It is located just east of the Cascade Range near the junction of Interstate 90 and Interstate 82. The population was 18,666 at the 2020 census. and was ...
to
Pendleton, Oregon Pendleton is a city and the county seat of Umatilla County, Oregon. The population was 17,107 at the time of the 2020 census, which includes approximately 1,600 people who are incarcerated at Eastern Oregon Correctional Institution. Pendleton ...
, was authorized by the BPR in October 1957 as part of an addition to the Interstate Highway System. It was numbered I-82 by AASHO in 1958, completing the initial allocation of for Washington. A rejected extension of I-82 across the
Cascade Range The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, ...
to Tacoma and
Aberdeen Aberdeen (; sco, Aiberdeen ; gd, Obar Dheathain ; la, Aberdonia) is a city in North East Scotland, and is the third most populous city in the country. Aberdeen is one of Scotland's 32 local government council areas (as Aberdeen City), and ...
, totaling , was submitted by Washington in 1959. Among the first Interstate projects in Washington to be built with funding from the Federal-Aid Highway Act of 1956 were bypasses of Fort Lewis and
Olympia The name Olympia may refer to: Arts and entertainment Film * ''Olympia'' (1938 film), by Leni Riefenstahl, documenting the Berlin-hosted Olympic Games * ''Olympia'' (1998 film), about a Mexican soap opera star who pursues a career as an athlet ...
that had already been planned by the state government. They were incorporated into I-5, and in early 1958 the Tacoma project became the first section in the state to use the
Interstate shield The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. Th ...
. I-5 was also the first Interstate to be fully completed in Washington, following the opening of a section between Everett and Marysville on May 14, 1969. The first auxiliary route to be fully completed was I-405, which was opened to traffic between
Woodinville Woodinville is a city in King County, Washington, United States. It is a part of the Seattle metropolitan area. There is also a much larger population with Woodinville mailing addresses in adjacent unincorporated areas of King ( Cottage Lake) and ...
and
Lynnwood Lynnwood is a city in Snohomish County, Washington, United States. The city is part of the Seattle metropolitan area and is located north of Seattle and south of Everett, near the junction of Interstate 5 and Interstate 405. It is the four ...
in November 1969. The state government made improvements to the expanding Interstate system in the 1960s and 1970s, building
rest area A rest area is a public facility located next to a large thoroughfare such as a motorway, expressway, or highway, at which drivers and passengers can rest, eat, or refuel without exiting onto secondary roads. Other names include motorway servi ...
s and
scenic overlook A scenic viewpoint – also called an observation point, viewpoint, viewing point, vista point, lookout, scenic overlook,These terms are more commonly used in North America. etc. – is an elevated location where people can view scenery (often w ...
s on the primary routes and introducing mileage-based
exit number An exit number is a number assigned to a road junction, usually an exit from a freeway. It is usually marked on the same sign as the destinations of the exit. In some countries, such as the United States, it is also marked on a sign in the gor ...
s in 1973. The southern section of I-82 between
Yakima Yakima ( or ) is a city in and the county seat of Yakima County, Washington, and the state's 11th-largest city by population. As of the 2020 census, the city had a total population of 96,968 and a metropolitan population of 256,728. The uninco ...
and Oregon was originally routed away from the Tri-Cities region, where local leaders petitioned for access to the Interstate system. Following a dispute between the states of Washington and Oregon, the FHWA proposed to route I-82 towards the Tri-Cities, which would be directly served by a
spur route A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway. A bypass or beltway should not be considered a true spur route as it typically reconnects with another or the s ...
. The new connector, numbered I-182, was approved in 1969 and fully opened in 1986 alongside the last Washington section of I-82; the highways were delayed by disagreements with local governments and spending cuts during the
early 1980s recession The early 1980s recession was a severe economic recession that affected much of the world between approximately the start of 1980 and 1983. It is widely considered to have been the most severe recession since World War II. A key event leading to ...
. The Washington section of I-205 was completed with the opening of the Glenn L. Jackson Memorial Bridge over the
Columbia River The Columbia River (Upper Chinook: ' or '; Sahaptin: ''Nch’i-Wàna'' or ''Nchi wana''; Sinixt dialect'' '') is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia, C ...
in December 1982, a few months before the Oregon section was fully open to traffic. The final Interstate to be added in Washington was I-705, a short spur into Downtown Tacoma, which was approved by the FHWA and AASHTO in 1978 and opened in 1988. The final section of the Interstate system in Washington, I-90 between Seattle 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 ...
, took over 30 years to plan and construct amid disagreements and litigation over its design and other mitigation. The section included construction of the
Homer M. Hadley Memorial Bridge The Third Lake Washington Bridge, officially the Homer M. Hadley Memorial Bridge, is a floating bridge in the Seattle metropolitan area of the U.S. state of Washington. It is one of the Interstate 90 floating bridges, carrying the westbound lan ...
to supplement the existing
Lacey V. Murrow Memorial Bridge The Lacey V. Murrow Memorial Bridge is a floating bridge in the Seattle metropolitan area of the U.S. state of Washington. It is one of the Interstate 90 floating bridges that carries the eastbound lanes of Interstate 90 across Lake Washingto ...
(both among the longest floating bridges in the world), expansion of the Mount Baker Tunnel, and a set of lids in Seattle and
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 ...
; its total cost was $1.56 billion (equivalent to $ in dollars), among the most expensive parts of the Interstate system. The FHWA estimated the total cost to construct the Interstate Highway System in the state to be $4.558 billion in 1989 (equivalent to $ in dollars), placing Washington eighth among all states by total cost. An outer
beltway A ring road (also known as circular road, beltline, beltway, circumferential (high)way, loop, bypass or orbital) is a road or a series of connected roads encircling a town, city, or country. The most common purpose of a ring road is to assist i ...
for the Seattle metropolitan area, bypassing I-405 and several Eastside suburbs, has been proposed under the unofficial moniker of "
I-605 Interstate 605 (abbreviated I-605, officially known as the San Gabriel River Freeway) is a major north–south auxiliary Interstate Highway in the Greater Los Angeles urban area of Southern California. It runs from I-405 and State Route& ...
" several times since the 1960s. The state government has never formally applied for its addition to the Interstate Highway System, but it was tentatively designated as State Route 605 (SR 605) by the legislature. Proposals to build a north–south freeway near
Lake Sammamish Lake Sammamish is a freshwater lake east of Seattle in King County, Washington, United States. The lake is long and wide, with a maximum depth of and a surface area of . It lies east of Lake Washington and west of the Sammamish Plateau, and ...
were defeated in 1968, but the idea was revived in 1998 as an extension of SR 18 through the
Snoqualmie Valley The Snoqualmie Valley is a farming and timber-producing region located along the Snoqualmie River in Western Washington, United States. The valley stretches from the confluence of the three forks of the river at North Bend to the confluence of th ...
. A 2004 study commissioned by the state legislature determined that an outer beltway would not be feasible to construct due to its high costs as well as opposition from local residents and environmental groups.


Primary Interstates

File:SeattleI5Skyline.jpg, alt=Night photograph of a wide freeway snaking through a skyline of high-rise building, I-5 in Downtown Seattle, 2007 File:Mount Rainier looming over I-5 southbound near SR 900 in Seattle.jpg, alt=A freeway with a snow-capped mountain in the background, I-5 near Seattle with
Mount Rainier Mount Rainier (), indigenously known as Tahoma, Tacoma, Tacobet, or təqʷubəʔ, is a large active stratovolcano in the Cascade Range of the Pacific Northwest, located in Mount Rainier National Park about south-southeast of Seattle. With a s ...
in the background File:Fred G Redmon Bridge 060329.jpg, alt=An arch bridge set against a desert-like landscape, The Fred G. Redmon Bridge on I-82 near
Yakima Yakima ( or ) is a city in and the county seat of Yakima County, Washington, and the state's 11th-largest city by population. As of the 2020 census, the city had a total population of 96,968 and a metropolitan population of 256,728. The uninco ...
File:Interstate 90 floating bridges from East Portal Viewpoint, Sept. 2019.jpg, alt=A pair of floating bridges, The
Interstate 90 floating bridges The Interstate 90 floating bridges is the common name for the twin floating bridges that carry a section of Interstate 90 across Lake Washington between Seattle and Mercer Island in the U.S. state of Washington. They are the: * Lacey V. Murrow M ...
on
Lake Washington Lake Washington is a large freshwater lake adjacent to the city of Seattle. It is the largest lake in King County and the second largest natural lake in the state of Washington, after Lake Chelan. It borders the cities of Seattle on the west, ...
File:I-90 as seen from Mount Si.jpg, alt=Aerial view of a freeway with two wide roadways set against trees, Aerial view of I-90 near North Bend File:Vantage Bridge, 2012.jpg, alt=Photograph of a wide river framed by bare cliffs with a bridge in the distance., I-90 crossing the
Columbia River The Columbia River (Upper Chinook: ' or '; Sahaptin: ''Nch’i-Wàna'' or ''Nchi wana''; Sinixt dialect'' '') is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia, C ...
on the Vantage Bridge


Auxiliary Interstates

File:I-182 westbound approaching US 395 and SR 397 in Pasco, WA.jpg, alt=Photograph of a freeway with several highway shields on the side, I-182 westbound in Pasco File:Glenn L. Jackson Memorial Bridge aerial view from southeast 2015-10-20.jpg, alt=A long highway bridge on a series of columns crossing over two bodies of water separated by an island, I-205 crossing the
Columbia River The Columbia River (Upper Chinook: ' or '; Sahaptin: ''Nch’i-Wàna'' or ''Nchi wana''; Sinixt dialect'' '') is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia, C ...
on the Glenn L. Jackson Memorial Bridge File:Interstate 405 southbound from Downtown Bellevue.jpg, alt=Aerial photograph of a freeway with light traffic passing through a built-up area with car dealerships and office parks, Aerial view of I-405 near
Downtown Bellevue Downtown Bellevue is the central business district of Bellevue, Washington, United States. It is bounded by I-405 to the east, NE 12th Street to the north, 100th Ave NE to the west, and Main Street to the south, and covers an area of around . I ...
File:I-705 northbound approaching SR 509 in Downtown Tacoma.jpg, alt=A freeway leading towards a cluster of high-rise buildings, parallel to a railroad, I-705 in Downtown Tacoma


See also

*


References


External links

{{commons category, Interstate Highways in Washington (state)
Washington State Department of TransportationWashington highways
at AARoads.com
Interstate Highways The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. Th ...
de:Liste der State-, U.S.- und Interstate-Highways in Washington