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Interstate 5 (I-5) is the main north–south
Interstate Highway 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. T ...
on the
West Coast of the United States The West Coast of the United States, also known as the Pacific Coast, Pacific states, and the western seaboard, is the coastline along which the Western United States meets the North Pacific Ocean. The term typically refers to the contiguous U.S ...
, running largely parallel to the
Pacific coast Pacific coast may be used to reference any coastline that borders the Pacific Ocean. Geography Americas Countries on the western side of the Americas have a Pacific coast as their western or southwestern border, except for Panama, where the Pac ...
of the contiguous U.S. from
Mexico Mexico (Spanish language, Spanish: México), officially the United Mexican States, is a List of sovereign states, country in the southern portion of North America. It is borders of Mexico, bordered to the north by the United States; to the so ...
to
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...
. It travels through the states of
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
,
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
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 ...
, serving several large cities on the U.S. West Coast, including
San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States ...
,
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world ...
,
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
, Portland, and
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 region o ...
. It is the only continuous Interstate highway to touch both the
Mexican Mexican may refer to: Mexico and its culture *Being related to, from, or connected to the country of Mexico, in North America ** People *** Mexicans, inhabitants of the country Mexico and their descendants *** Mexica, ancient indigenous people ...
and the
Canadian 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 ...
borders. Upon crossing the Mexican border at its southern terminus, I-5 continues to
Tijuana Tijuana ( ,"Tijuana"
(US) and
< ...
, Baja California, as Mexico Federal Highway 1 (Fed. 1). Upon crossing the Canadian border at its northern terminus, it continues to
Vancouver Vancouver ( ) is a major city in western Canada, located in the Lower Mainland region of British Columbia. As the most populous city in the province, the 2021 Canadian census recorded 662,248 people in the city, up from 631,486 in 2016. ...
as British Columbia Highway 99 (BC 99). I-5 was originally created in 1956 as part of the Interstate Highway System, but it was predated by several
auto trail The system of auto trails was an informal network of marked routes that existed in the United States and Canada in the early part of the 20th century. Marked with colored bands on utility poles, the trails were intended to help travellers i ...
s and highways built in the early 20th century. The Pacific Highway auto trail was built in the 1910s and 1920s by the states of California, Oregon, and Washington, and was later incorporated into U.S. Route 99 (US 99) in 1926. I-5 largely follows the route of US 99, with the exception of portions south of
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world ...
and in the Central Valley of California. The freeway was built in segments between 1956 and 1978, including expressway sections of US 99 that were built earlier to bypass various towns along the route. US 99 was removed in 1972.


Route description

, - , CA , , - , OR , , - , WA , , - , Total ,


California

The southern terminus of I-5 is at the Mexican border at the San Ysidro Port of Entry, the busiest land border crossing in the
Western Hemisphere The Western Hemisphere is the half of the planet Earth that lies west of the prime meridian (which crosses Greenwich, London, United Kingdom) and east of the antimeridian. The other half is called the Eastern Hemisphere. Politically, the te ...
; the crossing handles a daily average of 70,000 vehicles and 20,000 pedestrians crossing northbound and connects with
Mexican Federal Highway 1 Federal Highway 1 ( es, Carretera Federal 1, Fed. 1) is a free (libre) part of the federal highway corridors () of Mexico, and the highway follows the length of the Baja California Peninsula from Tijuana, Baja California, in the north to ...
in
Tijuana Tijuana ( ,"Tijuana"
(US) and
< ...
. The freeway splits in
San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States ...
's
San Ysidro San Ysidro (Spanish for " St. Isidore", ) is a district of the City of San Diego, immediately north of the Mexico–United States border. It neighbors Otay Mesa West to the north, Otay Mesa to the east, and Nestor and the Tijuana River Valley ...
neighborhood, with I-5 traveling northwest through
Chula Vista Chula Vista (; ) is the second-largest city in the San Diego metropolitan area, the seventh largest city in Southern California, the fifteenth largest city in the state of California, and the 78th-largest city in the United States. The popu ...
and National City on the John J. Montgomery Freeway and I-805 serving the eastern neighborhoods. I-5 follows the shore of
San Diego Bay San Diego Bay is a natural harbor and deepwater port located in San Diego County, California near the U.S.–Mexico border. The bay, which is long and wide, is the third largest of the three large, protected natural bays on California's of ...
and intersects State Route 15 (a continuation of
I-15 I15 may refer to: * Interstate 15, a north–south Interstate Highway in the United States of America * Polikarpov I-15, a Soviet fighter aircraft * I15 (band) "Soulja Girl" is the second single from American rapper Soulja Boy's studio album '' ...
) near
Naval Station San Diego Naval Base San Diego, also known as 32nd Street Naval Station, is the second largest surface ship base of the United States Navy and is located in San Diego, California. Naval Base San Diego is the principal homeport of the Pacific Fleet, con ...
. The freeway then travels around
Downtown San Diego Downtown San Diego is the city center of San Diego, California, the eighth largest city in the United States. In 2010, the Centre City area had a population of more than 28,000. Downtown San Diego serves as the cultural and financial center and ...
and
San Diego International Airport San Diego International Airport , formerly known as Lindbergh Field, is an international airport northwest of Downtown San Diego, California, United States. It is owned and operated by the San Diego County Regional Airport Authority.. US Feder ...
before reaching a junction with I-8. I-5 bisects the
University of California, San Diego The University of California, San Diego (UC San Diego or colloquially, UCSD) is a public land-grant research university in San Diego, California. Established in 1960 near the pre-existing Scripps Institution of Oceanography, UC San Diego is ...
campus, merging with I-805 nearby, and follows the Pacific coastline through the northern suburbs of San Diego. Between Oceanside and San Clemente, an stretch of the San Diego Freeway passes through
Marine Corps Base Camp Pendleton Marine Corps Base Camp Pendleton is the major West Coast base of the United States Marine Corps and is one of the largest Marine Corps bases in the United States. It is on the Southern California coast in San Diego County and is bordered by O ...
before entering Orange County. At Dana Point, I-5 turns inland and heads north through
Mission Viejo Mission Viejo ( ; corruption of ''Misión Vieja'', Spanish for "Old Mission") is a commuter city in the Saddleback Valley in Orange County, California, United States. Mission Viejo is considered one of the largest master-planned communities e ...
to the El Toro Y interchange in Irvine, where I-405 splits and carries the San Diego Freeway designation. I-5 continues northwest as the Santa Ana Freeway through several Orange County and
Los Angeles County Los Angeles County, officially the County of Los Angeles, and sometimes abbreviated as L.A. County, is the List of the most populous counties in the United States, most populous county in the United States and in the U.S. state of California, ...
suburbs and passes near
Disneyland Disneyland is a theme park in Anaheim, California. Opened in 1955, it was the first theme park opened by The Walt Disney Company and the only one designed and constructed under the direct supervision of Walt Disney. Disney initially envisio ...
in
Anaheim Anaheim ( ) is a city in northern Orange County, California, part of the Los Angeles metropolitan area. As of the 2020 United States Census, the city had a population of 346,824, making it the most populous city in Orange County, the 10th-most ...
. The freeway intersects I-605 in
Downey Downey may refer to: People * Downey (surname) *Robert Downey Jr. Places *Downey, California, US * Downey, Idaho, US * Downey, Iowa, US Businesses * W. & D. Downey, photographic studio * Downey Studios, created out of a former Boeing plant Scho ...
and I-710 in
Commerce Commerce is the large-scale organized system of activities, functions, procedures and institutions directly and indirectly related to the exchange (buying and selling) of goods and services among two or more parties within local, regional, natio ...
before reaching the city of
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world ...
. Southern Californians often refer to I-5 as "the 5" or as the Santa Ana Freeway in the Los Angeles area. At the
East Los Angeles Interchange The East Los Angeles Interchange is an interchange complex located in Boyle Heights, California, approximately 2.5 miles (4 km) east of Downtown Los Angeles. With its southern portion handling over 550,000 vehicles per day (2008 AADT), it is the ...
near
Downtown Los Angeles Downtown Los Angeles (DTLA) contains the central business district of Los Angeles. In addition, it contains a diverse residential area of some 85,000 people, and covers . A 2013 study found that the district is home to over 500,000 jobs. It is a ...
, I-5 intersects US 101 and begins a short concurrency with
I-10 Interstate 10 (I-10) is the southernmost cross-country highway in the American Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at , following I-90, I-80, and I-40. This freeway is part of the originally p ...
on a section of the
Golden State Freeway Interstate 5 (I-5) is a major north–south route of the Interstate Highway System in the United States, stretching from the Mexican border at the San Ysidro crossing to the Canadian border near Blaine, Washington. The segment of I-5 in ...
. The freeway splits from I-10 and turns northwest to follow the
Los Angeles River , name_etymology = , image = File:Los Angeles River from Fletcher Drive Bridge 2019.jpg , image_caption = L.A. River from Fletcher Drive Bridge , image_size = 300 , map = LARmap.jpg , map_size ...
through
Glendale Glendale is the anglicised version of the Gaelic Gleann Dail, which means ''valley of fertile, low-lying arable land''. It may refer to: Places Australia *Glendale, New South Wales ** Stockland Glendale, a shopping centre * Glendale, Queensland, ...
and into Burbank. I-5 then leaves the river and travels across the
San Fernando Valley The San Fernando Valley, known locally as the Valley, is an urbanized valley in Los Angeles County, California. Located to the north of the Los Angeles Basin, it contains a large portion of the City of Los Angeles, as well as unincorporated ar ...
, later crossing the Newhall Pass through the
Santa Susana Mountains The Santa Susana Mountains are a transverse range of mountains in Southern California, north of the city of Los Angeles, in the United States. The range runs east-west, separating the San Fernando and Simi valleys on its south from the Santa C ...
to reach the
Santa Clarita Valley The Santa Clarita Valley (SCV) is part of the upper watershed of the Santa Clara River in Southern California. The valley was part of the Rancho San Francisco Mexican land grant. Located in Los Angeles County, its main population center is th ...
; the Newhall Pass interchange with State Route 14 is notable for having separate lanes for truck traffic. The freeway passes the city of Santa Clarita and ascends into the Sierra Pelona Mountains, where the northbound and southbound lanes separate and cross sides for approximately . The northbound ascent includes a continuous 5 percent grade for . After passing Pyramid Lake, I-5 makes several turns as it follows a series of narrow valleys to reach the second-highest point of its entire length,
Tejon Pass The Tejon Pass , previously known as ''Portezuelo de Cortes'', ''Portezuela de Castac'', and Fort Tejon Pass is a mountain pass between the southwest end of the Tehachapi Mountains and northeastern San Emigdio Mountains, linking Southern Calif ...
(elevation ) in the
Tehachapi Mountains The Tehachapi Mountains (; Kawaiisu: ''Tihachipia'', meaning "hard climb") are a mountain range in the Transverse Ranges system of California in the Western United States. The range extends for approximately in southern Kern County and northwe ...
. The freeway then traverses the narrow Grapevine Canyon and descends for into the
San Joaquin Valley The San Joaquin Valley ( ; es, Valle de San Joaquín) is the area of the Central Valley of the U.S. state of California that lies south of the Sacramento–San Joaquin River Delta and is drained by the San Joaquin River. It comprises seven ...
. At Wheeler Ridge near the south end of the valley, State Route 99 splits from the freeway to serve
Bakersfield Bakersfield is a city in Kern County, California, United States. It is the county seat and largest city of Kern County. The city covers about near the southern end of the San Joaquin Valley and the Central Valley region. Bakersfield's populat ...
and other major cities in the Central Valley, while I-5 stays to the west. Now named the West Side Freeway, I-5 travels northwest along the edge of the Central Valley through farmland and avoids populated areas. The freeway is connected to several of the valley's main cities, including Fresno,
Merced Merced (; Spanish for "Mercy") is a city in, and the county seat of, Merced County, California, United States, in the San Joaquin Valley. As of the 2020 Census, the city had a population of 86,333, up from 78,958 in 2010. Incorporated on Apri ...
, and
Modesto Modesto () is the county seat and largest city of Stanislaus County, California, United States. With a population of 218,464 at the 2020 census, it is the 19th largest city in the state of California and forms part of the Sacramento-Stockton ...
, by other highways. Near Tracy, I-580 splits from I-5 to provide the first of several connections to the
San Francisco Bay Area The San Francisco Bay Area, often referred to as simply the Bay Area, is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. The Bay Area is defined by the Association of Bay Area G ...
;
I-205 Interstate 205 may refer to either of two unconnected Interstate Highways in the United States, both of which are related to Interstate 5 * Interstate 205 (California), a connector in the San Francisco Bay Area * Interstate 205 (Oregon–Washin ...
northeast of Tracy also provides a connection through I-580. The freeway continues north through Stockton to
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
, where it follows the
Sacramento River The Sacramento River ( es, Río Sacramento) is the principal river of Northern California in the United States and is the largest river in California. Rising in the Klamath Mountains, the river flows south for before reaching the Sacramento� ...
through the southern suburbs and along the edge of
downtown ''Downtown'' is a term primarily used in North America by English speakers to refer to a city's sometimes commercial, cultural and often the historical, political and geographic heart. It is often synonymous with its central business district ...
. I-5 intersects two transcontinental highways in the Sacramento area: US 50 (and unsigned I-305) south of downtown and I-80 in the northern suburbs. After an unsigned concurrency with State Route 99 in northern Sacramento, the freeway turns west to pass the city's airport and resumes its northwestern path at
Woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the '' plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...
. It then intersects I-505, another Bay Area connector, near Dunnigan. The freeway continues north along the western edge of the
Sacramento Valley , photo =Sacramento Riverfront.jpg , photo_caption= Sacramento , map_image=Map california central valley.jpg , map_caption= The Central Valley of California , location = California, United States , coordinates = , boundaries = Sierra Nevada (ea ...
, passing through farmland and several small towns before reaching the end of the valley at Red Bluff. I-5 then traverses the rugged Shasta Cascade region, passing through Redding and crossing Shasta Lake before beginning its ascent towards
Mount Shasta Mount Shasta ( Shasta: ''Waka-nunee-Tuki-wuki''; Karuk: ''Úytaahkoo'') is a potentially active volcano at the southern end of the Cascade Range in Siskiyou County, California. At an elevation of , it is the second-highest peak in the Cascad ...
. The freeway follows the Sacramento River upstream to the southwestern slopes of the mountain and turns northwest to reach Weed, where it intersects US 97, a major highway serving the Inland Northwest region. I-5 continues through
Yreka Yreka ( ) is the county seat of Siskiyou County, California, United States, near the Shasta River; the city has an area of about , most of it land. As of the 2020 United States Census, the population was 7,807, reflecting a meager increase f ...
in the
Shasta Valley Shasta or Shastan may refer to: Native American * Shasta Costa, a people group native to southwestern Oregon * Shasta language, extinct language of the Shasta people * Shasta people, a people group native to northern California and southern Ore ...
and follows the
Klamath River The Klamath River ( Karuk: ''Ishkêesh'', Klamath: ''Koke'', Yurok: ''Hehlkeek 'We-Roy'') flows through Oregon and northern California in the United States, emptying into the Pacific Ocean. By average discharge, the Klamath is the second la ...
into the
Siskiyou Mountains The Siskiyou Mountains are a coastal subrange of the Klamath Mountains, and located in northwestern California and southwestern Oregon in the United States. They extend in an arc for approximately from east of Crescent City, California, nort ...
, where it crosses into Oregon.


Oregon

I-5 enters Oregon near Siskiyou Summit, which sits at and is the highest point on the highway. From the summit, I-5 descends by over at a 6 percent grade to reach the Rogue Valley. The freeway passes through Ashland and Medford, running parallel to Oregon Route 99, and turns west to follow the Rogue River to
Grants Pass Grants Pass is the county seat of Josephine County, Oregon, United States. The city is located on Interstate 5 in Oregon, Interstate 5, northwest of Medford, Oregon, Medford, along the Rogue River (Oregon), Rogue River. The population was 39,189 ...
, where it intersects US 199. I-5 then turns north and crosses a series of passes in the Klamath Mountains to reach the Umpqua Valley, where it follows the
South Umpqua River The South Umpqua River is a tributary of the Umpqua River, approximately long, in southwestern Oregon in the United States. It drains part of the Cascade Range east of Roseburg. The river passes through a remote canyon in its upper reaches then ...
to Roseburg. The highway enters the
Willamette Valley The Willamette Valley ( ) is a long valley in Oregon, in the Pacific Northwest region of the United States. The Willamette River flows the entire length of the valley and is surrounded by mountains on three sides: the Cascade Range to the eas ...
near Cottage Grove and forms the boundary between the cities of Eugene and Springfield. After crossing the
Willamette River The Willamette River ( ) is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is long, lying entirely in northwestern Oregon in the United States. Flowing northward b ...
, I-5 intersects
Oregon Route 126 Oregon OR 126 (OR 126) is a state highway that connects coastal, western, and central parts of the U.S. state of Oregon. A short freeway section of OR 126 in Eugene and Springfield is concurrent with Interstate 105 (I-105). Rout ...
, which carries I-105, and Oregon Route 569; both highways provide connections to Eugene and Springfield. I-5 then travels due north through farmland on the east side of the Willamette River, passing a junction with US 20 in Albany, and bisects eastern Salem near the state capitol campus. It is connected to downtown Salem by Oregon Route 22 and the
Salem Parkway Salem Parkway may refer to: * Oregon Route 99E Business * Salem Parkway (North Carolina) The Salem Parkway is an freeway in the U.S. state of North Carolina, serving the cities of Winston-Salem and Kernersville. It is signed as U.S. Route 42 ...
, which joins I-5 as the freeway crosses the 45th parallel near Keizer. From Salem, I-5 turns northeast and passes Woodburn before crossing the Willamette River on the Boone Bridge in Wilsonville, at the south end of the
Portland metropolitan area The Portland metropolitan area is a metro area in the U.S. states of Oregon and Washington centered on the principal city of Portland, Oregon. The U.S. Office of Management and Budget (OMB) identifies it as the Portland–Vancouver–Hillsboro, ...
. The freeway travels through the southern suburbs of Portland, intersecting
I-205 Interstate 205 may refer to either of two unconnected Interstate Highways in the United States, both of which are related to Interstate 5 * Interstate 205 (California), a connector in the San Francisco Bay Area * Interstate 205 (Oregon–Washin ...
in Tualatin and Oregon Route 217 in Tigard before entering the city proper. I-5 then turns northeast to follow
Barbur Boulevard Oregon Route 99W is a state-numbered route in Oregon, United States, that runs from OR 99 and OR 99E in Junction City north to I-5 in southwestern Portland. Some signage continues it north to US 26 near downtown, but most signage agrees wi ...
(part of Route 99W) and navigate the
Terwilliger curves The "Terwilliger curves" is the name given to a , six-lane section of Interstate 5 (I-5) in Portland, Oregon, known as one of the most dangerous stretches of highway in the state. Named for its physical characteristics and proximity to Terwi ...
. The freeway continues north through the South Waterfront neighborhood, crossing under the Portland Aerial Tram and the western approach to the
Ross Island Bridge The Ross Island Bridge is a cantilever truss bridge that spans the Willamette River in Portland, Oregon. It carries U.S. Route 26 (Mount Hood Highway) across the river between southwest and southeast Portland. The bridge opened in 1926 and w ...
(carrying US 26) before reaching an interchange with I-405. I-5 and I-405 form a complete loop around Downtown Portland, with I-5 crossing the Willamette River on the Marquam Bridge to run along the eastern riverfront. The freeway has interchanges with several major bridges crossing the Willamette, as well as the western terminus of
I-84 Interstate 84 may refer to: * Interstate 84 (Oregon–Utah), passing through Idaho, formerly known as Interstate 80N * Interstate 84 (Pennsylvania–Massachusetts) Interstate 84 (I-84) is an Interstate Highway in the Northeaster ...
near the
Oregon Convention Center The Oregon Convention Center is a convention center in Portland, Oregon. Completed in 1989 and opened in 1990, it is located on the east side of the Willamette River in the Lloyd District neighborhood. It is best known for the twin spire towers, ...
. From the I-84 interchange to a second junction with I-405 near the Fremont Bridge, I-5 is concurrent with US 30, which continues west towards Astoria. Through North Portland, the freeway runs below street level until it crosses the
Columbia Slough The Columbia Slough is a narrow waterway, about long, in the floodplain of the Columbia River in the U.S. state of Oregon. From its source in the Portland suburb of Fairview, the Columbia Slough meanders west through Gresham and Portland to th ...
to bisect Delta Park. I-5 continues across Hayden Island to the
Interstate Bridge The Interstate Bridge (also Columbia River Interstate Bridge, I-5 Bridge, Portland-Vancouver Interstate Bridge, Vancouver-Portland Bridge) is a pair of nearly identical steel vertical-lift, Parker through-truss bridges that carry Interstate 5 ...
, a pair of vertical-lift bridges which carry the highway 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 ...
into Washington state.


Washington

The highway enters
Vancouver Vancouver ( ) is a major city in western Canada, located in the Lower Mainland region of British Columbia. As the most populous city in the province, the 2021 Canadian census recorded 662,248 people in the city, up from 631,486 in 2016. ...
at the north end of the Interstate Bridge and immediately intersects Washington State Route 14 near the
Fort Vancouver National Historic Site Fort Vancouver National Historic Site is a United States National Historic Site located in the states of Washington and Oregon. The National Historic Site consists of two units, one located on the site of Fort Vancouver in modern-day Vancouve ...
. The freeway passes near downtown Vancouver and continues north through the city's suburbs before being rejoined by I-205 at Salmon Creek. I-5 travels north along the Columbia River to Kelso and Longview, where it switches to following the Cowlitz River between the
Willapa Hills The Willapa Hills is a geologic, physiographic, and geographic region in southwest Washington. When described as a physiographical province, the Willapa Hills are bounded by the Pacific Ocean to the west, the Columbia River to the south, the Ol ...
and Cascade foothills. The freeway then turns northwest to traverse a
prairie Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the ...
and the adjacent cities of Chehalis and Centralia while concurrent with US 12. I-5 continues north to a junction with US 101 in
Tumwater Tumwater is a town in Thurston County, Washington, United States. The population was 25,350 at the 2020 census. It is situated near where the Deschutes River enters Budd Inlet, the southernmost point of Puget Sound; it also borders the state ...
, near Olympia and the state capitol campus. The freeway skirts the southeast side of downtown Olympia and turns east to cross
Joint Base Lewis–McChord Joint Base Lewis–McChord (JBLM) is a U.S. military installation home to I Corps and 62nd Airlift Wing located south-southwest of Tacoma, Washington under the jurisdiction of the United States Army Joint Base Headquarters, Joint Base Lewis–Mc ...
(formerly Fort Lewis and McChord Air Force Base). I-5 then turns north to enter Tacoma but bends east to intersect I-705, a short spur into Downtown Tacoma. The freeway turns north again after leaving Tacoma and its nearby seaport near
Fife Fife (, ; gd, Fìobha, ; sco, Fife) is a council area, historic county, registration county and lieutenancy area of Scotland. It is situated between the Firth of Tay and the Firth of Forth, with inland boundaries with Perth and Kinross ...
to traverse the suburbs of South King County. I-5 intersects its eastern bypass of
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 region o ...
, I-405, in Tukwila near Seattle–Tacoma International Airport. The freeway generally follows the
Green Green is the color between cyan and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495570 nm. In subtractive color systems, used in painting and color printing, it is created by a combin ...
and Duwamish rivers into Seattle, passing
Boeing Field Boeing Field, officially King County International Airport , is a public airport owned and operated by King County, five miles south of downtown Seattle, Washington. The airport is sometimes referred to as KCIA (King County International Airpo ...
and the
industrial district Industrial district concept was initially used by Alfred Marshall to describe some aspects of the industrial organisation of nations. Industrial district (ID) is a place where workers and firms, specialised in a main industry and auxiliary indus ...
in the process. I-5 intersects
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, an ...
near Seattle's Chinatown–International District on the south side of
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 ...
. The freeway turns northwest and bisects Downtown Seattle in a trench, with some sections covered by
Freeway Park Freeway Park, officially known as Jim Ellis Freeway Park, is an urban park in Seattle, Washington, United States, connecting the city's downtown to the Washington State Convention Center and First Hill. The park sits atop a section of Intersta ...
and the
Washington State Convention Center The Seattle Convention Center (SCC), formerly the Washington State Convention Center (WSCC), is a convention center in Seattle, Washington, United States. It consists of several exhibition halls and meeting rooms in buildings along Pike Stre ...
. ​It then turns north to intersect
Washington State Route 520 State Route 520 (SR 520) is a state highway and freeway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs from Seattle in the west to Redmond in the east. The freeway connects Seattle to the Eastside re ...
near Eastlake and crosses the
Ship Canal Bridge The Ship Canal Bridge is a double-deck steel truss bridge that carries Interstate 5 (I-5) over Seattle's Portage Bay (part of the Lake Washington Ship Canal, after which it is named) between Capitol Hill and the University District. The c ...
over
Portage Bay Portage Bay is a body of water, often thought of as the eastern arm of Lake Union, that forms a part of the Lake Washington Ship Canal in Seattle, Washington. To the east, Portage Bay is connected with Union Bay—a part of Lake Washington— ...
, which lies between
Lake Union Lake Union is a freshwater lake located entirely within the city limits of Seattle, Washington, United States. It is a major part of the Lake Washington Ship Canal, which carries fresh water from the much larger Lake Washington on the east to P ...
and
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, ...
. I-5 continues through northern Seattle, passing the University District near 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 Seatt ...
campus and Green Lake before leaving the city. The section between Downtown Seattle and Northgate includes a set of reversible express lanes that add extra capacity in the peak direction of travel. I-5 continues through the northern suburbs of Seattle and turns northeasterly in Lynnwood, where it is rejoined by I-405, which serves the Eastside region. The freeway travels north through Everett, skirting the city's downtown and intersecting US 2, and leaves the
Seattle metropolitan area The Seattle metropolitan area is an urban conglomeration in the U.S. state of Washington that comprises Seattle, its surrounding satellites and suburbs. It contains the three most populous counties in the state—King, Snohomish, and Pierce ...
for the rural Skagit Valley. I-5 descends into the valley and travels through
Mount Vernon Mount Vernon is an American landmark and former plantation of Founding Father, commander of the Continental Army in the Revolutionary War, and the first president of the United States George Washington and his wife, Martha. The estate is on ...
and Burlington before climbing into the
Chuckanut Mountains The Chuckanut Mountains (from "Chuckanut", an Indian word meaning "long beach far from a narrow entrance"), or Chuckanuts, are located on the northern Washington state coast of the Salish Sea, just south of Bellingham, Washington. Being a part of ...
, where it turns west towards Bellingham Bay (part of the Salish Sea). The freeway travels around downtown Bellingham and turns northwest to continue across the rural Fraser Lowland. I-5 terminates at the
Peace Arch Border Crossing The Peace Arch Border Crossing is the common name for the Blaine–Douglas crossing which connects the cities of Blaine, Washington and Surrey, British Columbia on the Canada–United States border. I5 on the American side joins BC Highway 99 on ...
on the Canadian border, adjacent to the eponymous monument, in Blaine. The highway becomes
British Columbia Highway 99 Highway 99 is a provincial highway in British Columbia that serves Greater Vancouver and the Squamish–Lillooet corridor over a length of . It is a major north–south artery within Vancouver and connects the city to several suburbs as well ...
, which continues northwest to
Vancouver Vancouver ( ) is a major city in western Canada, located in the Lower Mainland region of British Columbia. As the most populous city in the province, the 2021 Canadian census recorded 662,248 people in the city, up from 631,486 in 2016. ...
.


History

An extensive section of this highway (over ), from approximately Stockton, California, to Portland, Oregon, follows the track of the Siskiyou Trail. This trail was based on an older network of Native American footpaths connecting the
Pacific Northwest The Pacific Northwest (sometimes Cascadia, or simply abbreviated as PNW) is a geographic region in western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Thou ...
with California's Central Valley. By the 1820s, trappers from the
Hudson's Bay Company The Hudson's Bay Company (HBC; french: Compagnie de la Baie d'Hudson) is a Canadian retail business group. A fur trading business for much of its existence, HBC now owns and operates retail stores in Canada. The company's namesake business di ...
were the first non-Native Americans to use the route of today's I-5 to move between today's Washington state and California. During the second half of the 19th century, mule trains, stagecoaches, and the
Central Pacific railroad The Central Pacific Railroad (CPRR) was a rail company chartered by U.S. Congress in 1862 to build a railroad eastwards from Sacramento, California, to complete the western part of the " First transcontinental railroad" in North America. Incor ...
also followed the route of the Siskiyou Trail. By the early 20th century, pioneering automobile roads were built along the path of the Siskiyou Trail, notably the Pacific Highway. The Pacific Highway ran from
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, for ...
to San Diego, California, and was the immediate predecessor of much of US 99. The route of US 99 was in turn used as a basis for much of the route of today's I-5. A major deviation from the old US 99 route is the Westside Freeway portion of I-5 in California's Central Valley. To provide a faster and more direct north–south route through the state, the decision was made to build a new freeway to the west and bypass Fresno, Bakersfield, and the rest of population centers in the area instead of upgrading the existing highway (which was re-designated as part of SR 99). This re-route through California's Central Valley was the last section of I-5 to be constructed, with the final segment dedicated and opened to traffic near Stockton, California, on October 12, 1979. Representatives from both Canada and Mexico attended the dedication to commemorate the first contiguous freeway connecting the North American countries. It cost an estimated $2.3 billion in 1979 dollars (equivalent to $ in dollars) to construct all of I-5. This direct route also bypasses
San Francisco San Francisco (; Spanish for " Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous in California and 17t ...
and the rest of the San Francisco Bay Area. Original plans called for a loop Interstate with a directional suffix, I-5W. This route now roughly corresponds to I-580 from I-5 south of Tracy to Oakland, I-80 from Oakland to
Vacaville Vacaville is a city located in Solano County in Northern California. Sitting approximately from Sacramento and from San Francisco, it is within the Sacramento Valley. As of the 2020 census, Vacaville had a population of 102,386, making it th ...
, and I-505 from Vacaville to I-5 near Dunnigan. I-5W and most of the other Interstates around the country with directional suffixes were eventually renumbered or eliminated. Nevertheless, San Francisco is still listed as a
control city A control city is a city, locality, or other location posted on a series of traffic signs along a particular stretch of road indicating destinations on that route. Together with route numbers and cardinal directions, these focal points aid the mo ...
on northbound I-5 between SR 99 and I-580. On May 23, 2013, a portion of a bridge on I-5 collapsed in Washington (near Mount Vernon, between Seattle and the Canada–US border at mile marker 228.3), sending two cars into the water and requiring traffic in both directions to bypass the crossing. 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. Established in 1905, it is ...
used a temporary structure to restore access across the river while a permanent bridge replacement was built. That process was completed September 15, 2013. On December 18, 2017, an
Amtrak The National Railroad Passenger Corporation, doing business as Amtrak () , is the national passenger railroad company of the United States. It operates inter-city rail service in 46 of the 48 contiguous U.S. States and nine cities in Canada. ...
train derailed on an overpass crossing I-5 near Tacoma, Washington, and blocked several lanes of traffic. The I-5 corridor forms part of the West Coast Electric Highway, a partnership between the states of California, Oregon, and Washington to build and maintain a network of
charging station A charging station, also known as a charge point or electric vehicle supply equipment (EVSE), is a piece of equipment that supplies electrical power for charging plug-in electric vehicles (including electric cars, electric trucks, electric b ...
s for
electric vehicle An electric vehicle (EV) is a vehicle that uses one or more electric motors for propulsion. It can be powered by a collector system, with electricity from extravehicular sources, or it can be powered autonomously by a battery (sometimes ch ...
s. The pact was formed in 2009 and the first charging stations—spaced apart—opened in 2011. In 2019, the three states also broke ground on a similar charging network for electric trucks along I-5 called the West Coast Clean Transit Corridor Initiative. The program is a collaboration of nine utilities and two agencies representing municipal utilities, and aims to enable electric freight and delivery trucks to operate along the entire West Coast corridor.


Junction list

;California : at the Mexican border in
San Ysidro San Ysidro (Spanish for " St. Isidore", ) is a district of the City of San Diego, immediately north of the Mexico–United States border. It neighbors Otay Mesa West to the north, Otay Mesa to the east, and Nestor and the Tijuana River Valley ...
: in San Ysidro : on the Nestor–San Ysidro– Otay Mesa West neighborhood line (future I-905) : on the Barrio LoganSouthcrestLogan Heights neighborhood line (future I-15) : in
San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States ...
: in San Diego : in Irvine : on the
Downey Downey may refer to: People * Downey (surname) *Robert Downey Jr. Places *Downey, California, US * Downey, Idaho, US * Downey, Iowa, US Businesses * W. & D. Downey, photographic studio * Downey Studios, created out of a former Boeing plant Scho ...
Santa Fe Springs city line : in
Commerce Commerce is the large-scale organized system of activities, functions, procedures and institutions directly and indirectly related to the exchange (buying and selling) of goods and services among two or more parties within local, regional, natio ...
: in
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world ...
: in Boyle Heights. The highways travel concurrently through Boyle Heights. : on the Mission HillsGranada Hills neighborhood line : in
Sylmar Sylmar is a suburban neighborhood in the San Fernando Valley and is the northernmost neighborhood within the City of Los Angeles. Historically known for its profusion of sylvan olive orchards, Sylmar can trace its past to the 18th century and th ...
: in Wheeler Ridge (Former US 99, future I-7 or I-9) : southwest of Vernalis : south-southwest of Lathrop : in
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
: in Sacramento : south-southeast of Dunnigan : in Weed ;Oregon : east of
Grants Pass Grants Pass is the county seat of Josephine County, Oregon, United States. The city is located on Interstate 5 in Oregon, Interstate 5, northwest of Medford, Oregon, Medford, along the Rogue River (Oregon), Rogue River. The population was 39,189 ...
: on the EugeneSpringfield city line : in Albany : in Tualatin : in Portland : in Portland : in Portland. I-5/US 30 travels concurrently through Portland. : in Portland ;Washington : on the Salmon CreekMount Vista CDP line : south-southeast of Napavine. The highways travel concurrently to Grand Mound. : in
Tumwater Tumwater is a town in Thurston County, Washington, United States. The population was 25,350 at the 2020 census. It is situated near where the Deschutes River enters Budd Inlet, the southernmost point of Puget Sound; it also borders the state ...
: in Tacoma : in Tukwila : 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 region o ...
: in Seattle : in Lynnwood : in Everett : at the Canada–US border in Blaine


Auxiliary routes

*
San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States ...
, California— I-805 *
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world ...
, California— I-105 * Los Angeles and
Orange County, California Orange County is located in the Los Angeles metropolitan area in Southern California. As of the 2020 census, the population was 3,186,989, making it the third-most-populous county in California, the sixth-most-populous in the United States, ...
I-605 * Los Angeles and Orange County, California— I-405 *
Tracy, California Tracy is the second most populated city in San Joaquin County, California, United States. The population was 93,000 at the 2020 census. Tracy is located inside a geographic triangle formed by Interstate 205 on the north side of the city, Inter ...
I-205 Interstate 205 may refer to either of two unconnected Interstate Highways in the United States, both of which are related to Interstate 5 * Interstate 205 (California), a connector in the San Francisco Bay Area * Interstate 205 (Oregon–Washin ...
*
Sacramento, California ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento C ...
I-305 (unsigned) * Zamora, CaliforniaI-505 *
Eugene, Oregon Eugene ( ) is a city in the U.S. state of Oregon. It is located at the southern end of the Willamette Valley, near the confluence of the McKenzie and Willamette rivers, about east of the Oregon Coast. As of the 2020 United States Census, ...
I-105 *
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 ...
I-405 * Portland, Oregon, and
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 ...
I-205 Interstate 205 may refer to either of two unconnected Interstate Highways in the United States, both of which are related to Interstate 5 * Interstate 205 (California), a connector in the San Francisco Bay Area * Interstate 205 (Oregon–Washin ...
*
Tacoma, Washington Tacoma ( ) is the county seat of Pierce County, Washington, United States. A port city, it is situated along Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Pa ...
I-705 *
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 region o ...
, Washington— I-405 I-5 will have a complete set of auxiliary routes (i.e. 105, 205, 305, 405, 505, 605, 705, 805, 905), with the completion of I-905 in
San Diego County San Diego County (), officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the f ...
. Currently, I-80 and
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, an ...
are the only two Interstates to have complete sets of auxiliary routes. Several routes, including I-305 and I-505 in Oregon, were planned but left unbuilt due to local opposition.


References


External links

*
Interstate 5
at the Interstate Guide {{DEFAULTSORT:I05 05 Interstate 05 05