Interstate 5 in Washington
Interstate 5 is highlighted in red.
|Defined by RCW|
|Maintained by WSDOT|
|Length:||276.62 mi (445.18 km)|
|Existed:||August 7, 1947 by FHWA
1956 – present
|Lewis and Clark Highway (from Vancouver to SR-4 near Longview)|
|South end:||I-5 at the Oregon state line|
| SR 14 in Vancouver
SR 4 in Kelso
US 12 near Centralia
US 101 in Tumwater
SR 512 in Tacoma
SR 16 in Tacoma
I-705 in Tacoma
I-90 in Seattle
US 2 in Everett
SR 20 in Burlington
SR 542 in Bellingham
|North end:||BC 99 at Canada–United States border in Blaine|
Interstate 5 in Washington (I-5) is a 276.62-mile (445.18 km) highway in the U.S. state of Washington that extends from its border with Oregon to its border with Canada. Serving the cities of Vancouver, Kelso, Chehalis, Centralia, Olympia, Tacoma, Seattle, Everett, Mount Vernon, and Bellingham, it is the main route between Portland, Oregon, and Vancouver, British Columbia.
It is the only interstate to traverse the whole north–south length of Washington, but the state highways U.S. Route 97 and U.S. Route 395 do also. I-5 is also the only north–south primary interstate highway in Washington. The road is the busiest in the state; an estimated 240,000 motorists use the road daily. The second busiest is I-405 at 201,000.
- 1 Route description
- 2 History
- 3 Exit list
- 4 References
- 5 See also
- 6 External links
Vancouver to Tumwater
I-5 enters Washington at the Interstate Bridge over the Columbia River between Portland and Vancouver. It initially heads north through Vancouver and intersects SR 14, the first segment of SR 501, and SR 500 until the interchange with I-205 in Salmon Creek, where the freeway begins a turn to the northeast. I-5 closely follows the alignment of old U.S. Route 99, and in some locations the US 99 alignment has become I-5. The interstate passes the Vancouver branch of the Washington State University. Southeast of Ridgefield, the highway intersects SR 502 and the second segment of SR 501 before continuing north along the Columbia River to Woodland.
In Woodland, I-5 intersects SR 503 and starts to curve northwest towards Longview and Kelso. At Longview Junction, east of Longview, I-5 intersects SR 432 and continues north to Kelso. Here it intersects SR 4, formerly US 830, and SR 431 before curving northeast towards Castle Rock. In Castle Rock, the freeway intersects SR 411, and SR 504, which connects I-5 with Mount St. Helens, Spirit Lake, and Paradise. From Castle Rock, the highway goes north to Napavine and intersects SR 506 and SR 505 before becoming concurrent with US 12 and continuing north to intersect SR 508. After the intersection, I-5 and US 12 go into Chehalis, where the highway intersects SR 6.
After leaving Chehalis, I-5/US 12 enters Centralia and intersects SR 507 before splitting from US 12 north of the city. As the freeway continues north towards Olympia, it intersects SR 121, which connects the highway with Millersylvania State Park and loops back to I-5. As the freeway enters Tumwater, it passes the Olympia Airport before intersecting the northern terminus of US 101.
Tumwater to Tukwila
As I-5 leaves the US 101 interchange, the highway curves east and forms the southern boundary of Olympia. The highway also goes across Capitol Lake and intersects Capitol Way, which connects the freeway to the Washington State Capitol. After leaving Olympia, I-5 goes in a northeastern direction into Lacey, where it intersects SR 510. After passing Nisqually, the highway enters Du Pont, where it enters Fort Lewis. After passing Camp Murray and American Lake, the freeway comes to the proposed western terminus of SR 704, passes McChord Air Force Base, and enters Lakewood.
In Lakewood, I-5 intersects SR 512 and continues into Tacoma, where the freeway passes the Tacoma Mall and intersects major highways, such as SR 16, I-705, SR 7, and SR 167 before going east into Fife. In Fife, the highway intersects SR 99, a small portion of US 99 through the Puget Sound region, and then enters Federal Way. Here the freeway intersects the western terminus of SR 18, which has been proposed to be renumbered to I-605 after being upgraded to Interstate standards.
After also intersecting SR 516, the highway passes Angle Lake, the Seattle-Tacoma International Airport, and Westfield Southcenter before going into an interchange with I-405 and SR 518. SR 518 connects I-5 to the Seattle-Tacoma International Airport, and I-405 bypasses I-5 through Seattle.
Tukwila to Shoreline
From the I-405/SR 518 interchange, I-5 goes north and intersects SR 599, which connects I-5 to SR 99, and SR 900. From the interchanges, the highway passes Boeing Field and the West Seattle Bridge before having a large interchange with I-90. After the interchange, I-5 intersects SR 519 and enters Seattle.
In downtown Seattle, I-5 becomes a tunnel passing under the Washington State Convention and Trade Center and Freeway Park. Once I-5 begins to rise from the tunnel, it passes over the I-5 Colonnade and then intersects the western terminus of SR 520, which goes to Bellevue via the Evergreen Point Floating Bridge. From the interchange with SR 520, the freeway goes north along the Ship Canal Bridge over the Lake Washington Ship Canal and passes the University of Washington before entering Northgate.
Within the neighborhood of Northgate, the highway intersects SR 522 and merges with the I-5 express lanes at the Northgate Mall. From the Northgate Mall, I-5 goes north into Shoreline and intersects SR 523 and passes a King County Metro Transit base before intersecting SR 104 and entering Mountlake Terrace.
Seattle express lanes
Interstate 5 has 7.14 miles (11.49 km) of reversible express lanes within Seattle. The express lanes begin after the Yesler Way bridge and tunnel under the northbound lanes of I-5 and intersect Cherry Street/Columbia Street. From the interchange, the express lanes intersect Mercer Street and then cross the Ship Canal Bridge. The express lanes are on the lower deck below the lanes of I-5. Near the end of the bridge is a reversible ramp that accesses Northeast 42nd Street. After the bridge ends, the express lanes continue northbound and intersect with Ravenna Boulevard, Lake City Way, and Northeast 103rd Street/1st Avenue Northeast. Finally, the lanes merge with I-5 in Northgate just north of the Northgate Mall.
The express lanes are open to all traffic, however, some ramps are designated for HOV vehicles only to assist with traffic flow and mitigate constrained space. These ramps include Cherry Street/Columbia Street/5th Avenue, Ravenna Boulevard, and Pike Street/Downtown Seattle Transit Tunnel. The express lanes carry northbound traffic from 12pm to 11pm Monday through Friday and 2pm to 11pm Saturday and Sunday. They carry southbound traffic from 5 am to 11am Monday through Friday and from 7am to 1pm Saturday and Sunday.
Shoreline to Everett
After leaving Shoreline and intersecting SR 104, I-5 enters Snohomish County and Mountlake Terrace. From the interchange, the highway passes Lake Ballinger and intersects SR 524 before reaching the Alderwood Mall. Next to the mall, the freeway intersects SR 525 and I-405. From the interchange, I-5 passes Martha Lake, intersects SR 96, and passes Silver Lake before reaching the interchange between I-5, SR 99, SR 526, and SR 527 near the Everett Mall. SR 99 is part of Old US 99, SR 526 connects I-5 to the Boeing Everett Factory, and SR 527 connects Bothell with Everett.
After leaving the interchange, I-5 intersects 41st Street at a single-point urban interchange, the only one in the area. From the interchange, the freeway intersects SR 529 and then SR 529 Spur and US 2.
Everett to Mount Vernon
After leaving downtown Everett and the US 2/SR 529 Spur interchange, I-5 goes north across the Snohomish River and curves northeast to an interchange with SR 529. North of the interchange, the freeway enters Marysville and intersects SR 528. The highway passes the Tulalip Resort Casino at Quil Ceda, commonly known as the Quil Ceda Creek Casino, the Marysville Water Tower, Quil Ceda Village, the Tulalip Resort Casino and Tulalip Hotel, and Lakewood Crossing before intersecting SR 531 and leaving Marysville. From the Marysville City limits, I-5 passes Smokey Point and goes northwest to Island Crossing, where the highway intersects SR 530, which connects the freeway to Arlington, Darrington, and Rockport.
After the interchange, I-5 travels over the Stillaguamish River and passes Silvana before intersecting SR 532, which goes west to Stanwood and Camano Island. As the highway curves northwest, the freeway enters Skagit County. Once in Skagit County, I-5 goes into Conway, where it intersects SR 534, which goes east to serve Big Lake. From Conway, the freeway goes north into Mount Vernon, where I-5 intersects SR 536, which serves as a shortcut to Anacortes, via SR 20 and SR 20 Spur. 
Mount Vernon to Blaine
After leaving downtown Mount Vernon, the freeway intersects SR 538, which serves the Skagit Valley College and Clear Lake (via SR 9). After the interchange, the highway crosses the Skagit River, where part of the bridge collapsed on May 22, 2013, leaving a gap in the highway until a temporary bailey bridge span was built and opened on June 19. In September it was replaced with a more permanent span. On the other side of the river it continues north through Burlington. After passing the Cascade Mall, I-5 intersects SR 20, which goes west to Anacortes (via SR 20 Spur), Deception Pass, Whidbey Island, and Discovery Bay and SR 20 goes east to Okanogan, Omak, and Newport. The freeway also intersects SR 11, which serves Edison, Bow, Samish Island, and Bellingham.
From the interchange, I-5 travels north and curved west on the shoreline of Lake Samish north of Alger, which is also the point where the freeway enters Whatcom County. After traveling west, I-5 curves north again and intersects SR 11 before entering Bellingham. In Bellingham, the highway intersects SR 542, which goes to Mount Baker, and SR 539, which goes to Lynden and British Columbia. The freeway passes the Bellis Fair Mall, Bellingham International Airport, and Ferndale before intersecting SR 548, which serves Blaine. Once in Blaine, I-5 intersects SR 543, which leads to the truck and freight border crossing. The freeway then intersects SR 548 again and then crosses the Canadian border into British Columbia as Highway 99 at the Peace Arch.
As part of the state's first connected state highway system, the Washington State Legislature designated the Pacific Highway between Vancouver and Blaine in 1913. The State Highway Board selected a route that would connect the main cities of Western Washington, which were Vancouver, Olympia, Tacoma, Seattle, Everett, and Bellingham. In 1923, by which time the entire road had been improved, the highway became State Road 1 (Primary State Highway 1 after 1937), but retained its name. By that time, most of the route of Interstate 5 became US 99, which was established in 1926.
Later in 1956, President Dwight D. Eisenhower signed the Federal-Aid Highway Act of 1956 which started the construction of Interstate Highways. In 1968, US 99 was removed from the system entirely, a year before the last portion of Interstate 5 opened on November 14, 1969. Legally, the Washington section of I-5 is defined at Washington Revised Code § 47.17.020. Several projects are currently ongoing and have been completed in the recent years on I-5.
Kelso to Centralia
During the past two decades, parts of the interstate have been periodically inundated by floodwaters as a result of area storms. Floods in November 1990, February 1996, December 2007, and January 2009 each caused temporary closures of I-5 between the Kelso-Longview and Chehalis-Centralia areas. The causes of this problem, as noted by the United States Army Corps of Engineers, are attributable to "decades of clear-cut logging, modifications of waterways, and destruction of natural flood control features within the Chehalis River basin."
The December 3, 2007, flood closed a 20-mile (32 km) section of the interstate for four days. The Washington State Department of Transportation recommended a 440-mile (710 km) detour between Portland and Seattle, by way of I-90, I-82, and I-84, adding 270 miles (430 km) to the 170-mile (270 km) trip.
The January 7, 2009 flood closed a 20-mile (32 km) section of the interstate for several days. The Washington State Department of Transportation was unable to offer a detour since all three main east/west passes were also closed due to severe mudslide and avalanche danger.
South of the Ship Canal Bridge Interstate 5 separates the Eastlake and Cascade neighborhoods from the Capitol Hill neighborhood, and separates Downtown Seattle from the Capitol Hill and First Hill neighborhoods. Its construction necessitated the demolition of significantly developed areas and cut off walking commutes to downtown for many First Hill residents, who "were by far the most vociferous critics of the proposed route," but far from the only ones. Architect Paul Thiry said in the early 1970s, "It was with the Freeway, cutting through the very heart of the city, that Seattle began taking one of its wrong turns and started to lose its identity as a city." He proposed a lid extending from Columbia Street north to Olive Way, roughly the entire length of downtown.
Among the buildings torn down in the Downtown-First Hill area to build the freeway was the Hotel Kalmar at Sixth Avenue and James Street (built 1881 as the Western Hotel, demolished 1962), the last of Seattle's pioneer-era hotels, predating the Great Seattle Fire, and Seattle's then-oldest public building, the Seventh Avenue Fire Hall (built 1890, demolished c. 1962).
In the years since the freeway's construction, Seattle has made several efforts to stitch back together pedestrian routes disrupted by the freeway, achieving part of Thiry's proposed "lid". The most visible of these efforts are Freeway Park (opened 1976), built as a lid over the freeway and connecting Downtown to First Hill, and the Washington State Convention and Trade Center (built 1982-1988) adjacent to Freeway Park, also bridging the freeway. The 7.5-acre (30,400 m2) I-5 Colonnade mountain bike park (opened 2007) uses the freeway as a roof and reconnects Eastlake to Capitol Hill.
On Interstate 5, the only planned improvement on the express lanes is a direct connection to the future SR 520 HOV lanes, to be constructed as part of the Evergreen Point Floating Bridge replacement project.
Seattle to Everett
Everett to Mount Vernon
The portion of I-5 from US 2 / SR 529 Spur in Everett to SR 528 in Marysville opened at a ribbon-cutting ceremony on May 14, 1969 by Devvie Herivel, Miss Everett, and Katherine Smith, Miss Marysville. This was the last portion of Interstate 5 from California to Canada that was opened, free of traffic lights and draw bridges. The stretch of I-5 from Marysville to Mount Vernon was already opened as a 4-lane divided highway without overpasses.
||Vancouver||0.41||0.66||1A||SR 14 east – Camas|
|0.45||0.72||1B||6th Street – Vancouver City Center||Northbound exit and southbound entrance|
|1.05||1.69||1C||SR 501 (Mill Plain Boulevard) – Vancouver City Center, Port of Vancouver|
|1.58||2.54||1D||4th Plain Boulevard|
|2.35||3.78||2||SR 500 east / 39th Street – Orchards|
|3.07||4.94||3||Northeast Highway 99, Main Street|
|4.36||7.02||4||Northeast 78th Street|
|5.39||8.67||5||Northeast 99th Street|
|7.24||11.65||7||Northeast 134th Street, WSU Vancouver||Southbound exit is via I-205|
|7.48||12.04||7||I-205 south to SR 14 / I-84-Salem||Southbound exit and northbound entrance|
|9.51||15.30||9||Northeast 179th Street – Clark County Fairgrounds|
|11.20||18.02||11||SR 502 east (Northeast 219th Street) – Battle Ground|
|Ridgefield||14.21||22.87||14||SR 501 west (Pioneer Street) – Ridgefield|
|16.80||27.04||16||Northwest La Center Road – La Center|
||Woodland||21.08||33.92||21||SR 503 east – Woodland, Cougar|
|22.72||36.56||22||Dike Access Road|
|27.70||44.58||27||Todd Road – Port of Kalama|
|32.28||51.95||32||Kalama River Road|
|Kelso||36.97||59.50||36||SR 432 west to SR 4 / US 30 – Longview, Long Beach, Kelso|
|39.88||64.18||39||SR 4 west – Kelso|
|40.77||65.61||40||To SR 4 / North Kelso Avenue – Kelso, Longview, Long Beach|
|42.73||68.77||42||Sparks Drive, Pleasant Hill Road|
|Castle Rock||48.04||77.31||48||I-5 Bus. north (Huntington Avenue) – Castle Rock|
|49.91||80.32||49||SR 411 south (I-5 Bus. south) / SR 504 east – Castle Rock, Toutle|
|52.72||84.84||52||Barnes Drive, Toutle Park Road|
||57.41||92.39||57||Jackson Highway, Barnes Drive|
|59.27||95.39||59||SR 506 west – Vader, Ryderwood|
|60.98||98.14||60||Toledo Vader Road|
|63.49||102.18||63||SR 505 – Winlock, Toledo|
|68.48||110.21||68||US 12 east – Yakima, Morton||South end of US 12 overlap|
|Napavine||71.12||114.46||71||SR 508 east – Onalaska, Napavine|
|78.04||125.59||77||SR 6 west – Pe Ell, Raymond|
|Centralia||81.74||131.55||81||SR 507 north (Mellen Street)|
|82.80||133.25||82||Harrison Avenue, Factory Outlet Way|
||88.40||142.27||88||US 12 west – Aberdeen, Tenino||North end of US 12 overlap|
|95.28||153.34||95||SR 121 north – Littlerock, Maytown|
|99.35||159.89||99||SR 121 south (93rd Avenue)|
|Tumwater||101.37||163.14||101||Tumwater Boulevard – Olympia Airport|
|102.86||165.54||102||Trosper Road – Black Lake|
|104.05||167.45||103||Deschutes Way, 2nd Avenue||No southbound entrance|
|104.39||168.00||104||US 101 north – Aberdeen, Port Angeles|
|Olympia||105.52||169.82||105A||State Capitol, Olympia City Center||Signed as exit 105 northbound|
|105.82||170.30||105B||Port of Olympia||Signed as exit 105 northbound|
|Lacey||108.46||174.55||108A||Sleater–Kinney Road south||No northbound entrance; signed as exit 108 southbound|
|108.46||174.55||108B||Sleater–Kinney Road north||No northbound entrance; southbound exit is via exit 109|
|108.96||175.35||108C||College Street||Northbound exit only|
|112.01||180.26||111||SR 510 east (Marvin Road) – Yelm|
|114.36||184.04||114||Nisqually, Old Nisqually|
||116.77||187.92||116||Mounts Road – Old Nisqually|
|120.93||194.62||120||Joint Base Lewis-McChord|
|124.70||200.69||124||Gravelly Lake Drive|
|125.92||202.65||125||Bridgeport Way – McChord AFB|
|127.54||205.26||127||SR 512 east / South Tacoma Way – Puyallup|
|128.98||207.57||128||South 84th Street||Southbound exit is via exit 129|
|Tacoma||129.65||208.65||129||South 72nd Street|
|130.75||210.42||130||South 56th Street, Tacoma Mall Boulevard|
|131.89||212.26||132||SR 16 west (South 38th Street) – Gig Harbor, Bremerton, Tacoma Mall|
|133.76||215.27||133||I-705 north / SR 7 south – Tacoma City Center|
|134.93||217.15||134||Portland Avenue||Southbound exit is via exit 135|
|135.09||217.41||135||SR 167 north – Puyallup|
|Fife||136.15||219.11||136||20th Street East – Port of Tacoma||Signed as exits 136A (20th Street) and 136B (Port of Tacoma) northbound|
|137.51||221.30||137||SR 99 north – Milton, Fife|
||Federal Way||142.06||228.62||142||SR 18 (South 348th Street) – North Bend, Auburn||Signed as exits 142A (east) and 142B (west)|
|143.89||231.57||143||South 320th Street – Federal Way|
|144.08||231.87||—||South 317th Street||HOV only|
|Kent||146.87||236.36||147||South 272nd Street|
|149.23||240.16||149||SR 516 – Kent, Des Moines||Signed as exits 149A (east) and 149B (west) northbound|
|SeaTac||151.24||243.40||151||Military Road, South 200th Street|
|152.32||245.14||152||South 188th Street, Orillia Road South|
|Tukwila||154.19||248.14||153||Southcenter Parkway – Southcenter Mall||Northbound exit and southbound entrance|
|154.46||248.58||154||I-405 north / SR 518 west – Sea-Tac Airport, Renton, Burien||Signed as exits 154A (I-405) and 154B (SR 518) southbound|
|154.71||248.98||154B||Southcenter Boulevard – Southcenter Mall||Southbound exit and northbound entrance|
|156.00||251.06||156||SR 599 north (West Marginal Way) / Interurban Avenue – Tukwila|
|157.40||253.31||157||SR 900 east (M. L. King Way)|
|158.07||254.39||158||Boeing Access Road, East Marginal Way, Airport Way|
|Seattle||161.27||259.54||161||Swift Avenue, Albro Place|
|162||Corson Avenue, Michigan Street|
|163.03||262.37||163A||Columbian Way, West Seattle Bridge||Signed as exit 163 northbound|
|163.54||263.19||163B||Forest Street, 6th Avenue South||Southbound exit only|
|164||Airport Way||Southbound exit only|
|164.55||264.82||164A||I-90 east – Bellevue, Spokane||Signed as exit 164 southbound|
|164.55||264.82||164B||4th Avenue South / South Atlantic Street (SR 519)||Signed as exit 164 southbound|
|164.68||265.03||164||Dearborn Street||Signed as exit 164A northbound; no southbound entrance|
|165.35||266.11||—||Express Lanes||Northbound exit and southbound entrance|
|165.38||266.15||165A||James Street||Signed as exit 164A northbound|
|165.63||266.56||164A||Madison Street – Convention Center||Northbound exit only|
|165.75||266.75||165||Seneca Street||Northbound exit and southbound entrance|
|165.81||266.85||165B||Union Street||Southbound exit and northbound entrance|
|166.26||267.57||166||Olive Way||Northbound exit and entrance|
|166.42||267.83||166||Stewart Street, Denny Way||Southbound exit and entrance|
|167||Mercer Street – Seattle Center|
|167.73||269.94||168A||Lakeview Boulevard||Northbound exit and southbound entrance|
|168.12||270.56||168B||SR 520 – Bellevue, Kirkland|
|168.18||270.66||168A||Boylston Avenue, Roanoke Street||Southbound exit and northbound entrance|
|169.44||272.69||169||Northeast 45th Street|
|169.69||273.09||169||Northeast 50th Street|
|170.31||274.09||170||Ravenna Boulevard, Northeast 65th Street||Northbound exit and southbound entrance|
|170.70||274.72||171||Northeast 71st Street, Northeast 65th Street||Southbound exit and northbound entrance|
|170.87||274.99||171||SR 522 (Lake City Way) – Bothell||Northbound exit and southbound entrance|
|171.56||276.10||172||North 85th Street, Aurora Avenue North (SR 99), Northeast 80th Street|
|172.58||277.74||—||Express Lanes||Southbound exit and northbound entrance|
|172.82||278.13||173||1st Avenue Northeast, Northgate Way|
|173.89||279.85||174||Northeast 130th Street, Roosevelt Way||Northbound exit and southbound entrance|
|Seattle–Shoreline city line||174.64||281.06||175||SR 523 (Northeast 145th Street) / 5th Avenue Northeast|
|Shoreline||175.58||282.57||Metro Transit Base||Transit Base traffic only|
|176.19||283.55||176||Northeast 175th Street – Shoreline|
|King–Snohomish county line
||Shoreline–Mountlake Terrace city line||177.81||286.16||177||SR 104 (Northeast 205th Street) – Edmonds, Lake Forest Park|
||Mountlake Terrace||178.33||286.99||178||236th Street Southwest – Mountlake Terrace||Northbound exit and southbound entrance|
|179.35||288.64||179||220th Street Southwest – Mountlake Terrace|
|Lynnwood||180.69||290.79||—||46th Avenue West (Lynnwood Transit Center)||HOV only|
|180.77||290.92||181A||To SR 524 / 44th Avenue West – Lynnwood||Northbound exit and southbound entrance|
|181.59||292.24||181B||SR 524 (196th Street Southwest) / Alderwood Mall Parkway – Lynnwood||Signed as exit 181 southbound|
|182.67||293.98||182||I-405 south – Renton, Bellevue|
|182.67||293.98||182||SR 525 north to SR 99 – Mukilteo||Northbound exit and southbound entrance|
|183.96||296.05||183||164th Street Southwest|
|184.21||296.46||Ash Way||Northbound exit and southbound entrance (buses only)|
|186.49||300.13||186||SR 96 east (128th Street Southwest)|
|Everett||187.80||302.23||—||112th Street Southeast||HOV only|
|189.37||304.76||189||SR 99 south (Everett Mall Way) / SR 526 west / SR 527 south / Broadway – Mukilteo, Whidbey Island Ferry|
|192.51||309.81||—||Broadway||Northbound exit only (HOV only)|
|192.72||310.15||192||41st Street, Evergreen Way|
|193.69||311.71||193||SR 529 (Pacific Avenue) – Everett City Center||Northbound exit and southbound entrance|
|193.98||312.18||194||US 2 east – Snohomish, Wenatchee|
|194.08||312.34||194||SR 529 (Everett Avenue) – Everett City Center||Southbound exit and northbound entrance|
|194.87||313.61||195||Marine View Drive – Port of Everett||Northbound exit and southbound entrance|
|198.33||319.18||198||SR 529 south (North Broadway) – Port of Everett||Southbound exit and northbound entrance|
|199.17||320.53||199||SR 528 east – Marysville, Tulalip|
|200.84||323.22||200||88th Street Northeast, Quil Ceda Way|
|202.52||325.92||202||116th Street Northeast|
|Arlington||206.13||331.73||206||SR 531 (172nd Street Northeast) – Smokey Point|
|208.72||335.90||208||SR 530 – Silvana, Arlington, Darrington|
|210.36||338.54||210||236th Street Northeast|
|212.71||342.32||212||SR 532 west – Stanwood, Camano Island|
|215.09||346.15||215||300th Street Northwest|
|221.13||355.87||221||SR 534 east – Lake McMurray|
|224.00||360.49||224||Old Highway 99 South||Northbound exit and southbound entrance|
|Mount Vernon||225.19||362.41||225||Anderson Road|
|226.45||364.44||226||SR 536 west (Kincaid Street)|
|227.79||366.59||227||SR 538 east (College Way)|
|Skagit River Bridge|
|Burlington||228.93||368.43||229||George Hopper Road|
|230.20||370.47||230||SR 20 – Anacortes, Burlington|
|231.27||372.19||231||SR 11 north (Chuckanut Drive) – Bow, Edison, Burlington|
|232.89||374.80||232||Cook Road – Sedro-Woolley|
|236.45||380.53||236||Bow Hill Road – Bow, Edison|
||242.92||390.94||242||Nulle Road – South Lake Samish|
|246.30||396.38||246||North Lake Samish|
|Bellingham||250.79||403.61||250||SR 11 south (Old Fairhaven Parkway, Chuckanut Drive) - Alaska Marine Highway|
|252.14||405.78||252||Samish Way – Western Washington University|
|253.85||408.53||254||Iowa Street, Ohio Street, State Street|
|254.88||410.19||255||SR 542 east (Sunset Drive) – Mt. Baker|
|256.27||412.43||256||SR 539 north (Meridian Street) / Bellis Fair-Mall Parkway||Signed as exits 256A (SR 539) and 256B (Bellis Fair-Mall Parkway) northbound|
|257.72||414.76||258||Bakerview Road – Bellingham International Airport|
|260.19||418.74||260||Slater Road – Lummi Island|
|Ferndale||262.63||422.66||262||Main Street – Ferndale City Center|
|266.04||428.15||266||SR 548 north (Grandview Road) – Custer|
|270.30||435.01||270||Birch Bay, Lynden|
|Blaine||274.23||441.33||274||Peace Portal Drive – Semiahmoo||Northbound exit and southbound entrance|
|275.21||442.91||275||SR 543 north / H Street – Truck Customs||Northbound exit and southbound entrance (Pacific Border Crossing, continues north as 176th Street in Surrey BC)|
|276.26||444.60||276||SR 548 south – Blaine City Center, Peace Arch State Park|
|276.62||445.18||Canada–United States border
Continues north as BC Highway 99
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
Downtown Seattle express lanes
|165.29||266.01||I-5 south||South end of express lanes|
|165.62||266.54||5th Avenue, Columbia Street||Southbound exit and northbound entrance (HOV only)|
|166.49||267.94||Pike Street (Metro Transit Tunnel)||Southbound exit and northbound entrance (HOV only)|
|166.63||268.16||Stewart Street – Seattle City Center||Southbound exit and northbound entrance|
|Mercer Street||Southbound exit and northbound entrance|
|168.96||271.91||Northeast 42nd Street – University of Washington||Northbound exit and southbound entrance|
|169.66||273.04||Ravenna Boulevard||Southbound entrance only (HOV only)|
|170.54||274.46||SR 522 (Lake City Way) – Bothell||Northbound exit and southbound entrance|
|172.07||276.92||Northeast 103rd Street, 1st Avenue Northeast||Northbound exit and southbound entrance|
|172.43||277.50||I-5 north – Everett, Vancouver, BC||North end of express lanes|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- "Scenic Highways - Interactive Map". Washington State Department of Transportation. Retrieved September 5, 2012.
- Federal Highway Administration Route Log and Finder List, Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002
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- Washington State Department of Transportation. "WSDOT Interchange Viewer - Interstate 5 (Exit 36 to 63)". Retrieved 2008-08-10.
- Washington State Department of Transportation. "WSDOT Interchange Viewer - Interstate 5 (Exit 68 to 118)". Retrieved 2008-08-10.
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- Washington State Department of Transportation (2006). WSDOT I-5 Express Lane Map (Map). http://www.wsdot.wa.gov/Northwest/King/ExpressLanes/I5map.htm. Retrieved 2008-08-08.
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- Washington State Department of Transportation. "WSDOT Interchange Viewer - Interstate 5 (Exit 183 to 229)". Retrieved 2008-08-10.
- Google Inc. Google Maps – SR 20 Overview Map (Map). Cartography by Google, Inc. http://maps.google.com/maps?f=d&saddr=WA-20+%4047.987814,+-122.886368&daddr=48.480204,-121.508789+to:US-97+%4048.411060,+-119.513880+to:WA-20+%4048.591390,+-118.187580+to:WA-20+%4048.665470,+-117.475950+to:WA-20+%4048.207193,+-117.064262+to:WA-20%2FW+Walnut+St+%4048.184034,+-117.044082&hl=en&geocode=14465331844282224964,47.987814,-122.886368%3B13433695717176385689,48.411060,-119.513880%3B11573222720205184507,48.591390,-118.187580%3B3382576660373117686,48.665470,-117.475950%3B9723890516125057339,48.207193,-117.064262%3B9627659935565309058,48.184034,-117.044082&mra=dpe&mrcr=0&mrsp=1&sz=7&via=1,2,3,4,5&sll=48.319734,-122.277832&sspn=2.213478,4.570312&ie=UTF8&ll=48.69096,-120.410156&spn=4.394576,9.140625&z=6. Retrieved 2008-08-01.
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- Washington State Legislature (1913). "An act relating to public highways, classifying the same and naming and fixing the routes of certain state roads.". Session Laws of the State of Washington. Olympia, WA: State of Washington. 1913 chapter 65, p. 221.: "A highway starting at the international boundary line at Blaine, Washington; thence southerly by the most feasible route through the cities of Bellingham, Mount Vernon, Everett, Seattle, Renton, along the easterly side of the White River Valley through Kent, Auburn, Tacoma, Olympia, Tenino, Centralia, Chehalis, to the southern boundary line at the city of Vancouver, Washington, to be known as The Pacific Highway."
- Washington State Legislature (1913) . "65". Session Laws of the State of Washington. Session Laws of the State of Washington (1913 ed.). Olympia, Washington: Washington State Legislature. p. 221. Retrieved 2008-08-10.[dead link]
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- Rand McNally, Official 1923 Auto Trails Map, District No. 14: Washington, Oregon, Northern California, Western Idaho
- Washington State Legislature (1923). "An act relating to, classifying, naming and fixing the routes of certain state highways, amending Section 6796, and repealing Sections 6791, 6792, 6793, 6794, 6795, 6797, 6798, 6799, 6800, 6801, 6802, 6803, 6804, 6805, 6806, 6808, 6809, 6811, 6812, 6813 and 6816 of Remington's Compiled Statutes.". Session Laws of the State of Washington. Olympia, WA: State of Washington. 1923 chapter 185, p. 627-628.: "A primary state highway, to be known as State Road No. 1 or the Pacific Highway, is established as follows: Beginning at the international boundary line at Blaine in the County of Whatcom; thence by the most feasible route in a southerly direction through the cities of Bellingham, Mt. Vernon, Everett, Seattle, Tacoma, Olympia, Chehalis, Kelso and Vancouver to the interstate bridge over the Columbia River between Vancouver and Portland."
- United States Department of Agriculture. "Final 1926 Plan of the U.S. Highway System" (November 11, 1926). Retrieved on August 10, 2008.
- Department of Highways, Highway Map: State of Washington, Revised to April 1, 1933
- Department of Highways, Highways of the State of Washington (Rand McNally), 1939
- United States Department of Transportation/Federal Highway Administration (2006-07-07). "The Greatest Decade 1956-1966 Part 1 Essential to the National Interest". Retrieved 2008-08-11.
- United States Department of Transportation/Federal Highway Administration. "History of the Interstate Highway System". Retrieved 2008-08-11.
- Washington State Department of Transportation. "WSDOT - History of WSDOT (1967-1977)". Retrieved 2008-08-11.
- Washington State Legislature. "RCW 47.17.020: State route No. 5 — Washington green highway". Retrieved 2008-08-10.
- Washington State Department of Transportation. "WSDOT - Construction Projects on Interstate 5". Retrieved 2008-08-11.
- Mote, Philip; Josiah Mault, Valerie Duliere (December 2008). "The Chehalis River flood of December 3–4, 2007". Office of Washington State Climatologist, University of Washington. Retrieved 2009-10-17.
- United States Army Corps of Engineers (2002). "US Army Corps of Engineers Civil Works Program, Congressional Submission, Fiscal Year 2002, Northwestern Division". p. 32 (report), p. 35 (PDF). Archived from the original on 2008-05-28. Retrieved 2008-08-10.
- Fiman, Alice (2007-12-12). "Interstate 5 Reopens to All Traffic Through Chehalis, Highways Still Closed Elsewhere in the State". Olympia, Washington: Washington State Department of Transportation. Retrieved 2008-08-10.[dead link]
- Washington State Department of Transportation. "I-5 2007 Flood Re-building Project". Retrieved 2008-08-10.
- Bateman, Alissa (2007-12-04). "I-5 Remains Closed in Lewis County". Olympia, Washington: Washington State Department of Transportation. Retrieved 2008-08-10.[dead link]
- Paula Becker (2003-04-30). "First Hill neighborhood objects to the Seattle Freeway route at a public hearing on September 13, 1961". HistoryLink. Retrieved 2007-11-07.
- Jones, Nard (1972). Seattle. Doubleday. p. 21. ISBN 0-385-01875-4.
- Victor Steinbrueck, Seattle Cityscape, University of Washington Press, Seattle, 1962, p. 43.
- Paul Dorpat (1999-01-01). "Now & Then -- Seattle's Kalmar Hotel". HistoryLink. Retrieved 2007-11-07.
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- Cameron 2004, pp. 331, 332, "On February 3, 1965, Rose Clare Menalo of Meadowdale High School, Miss Sno-King, cut the ribbon which opened the long awaited 19.7 miles of the Everett to Seattle section of the new I-5 freeway."
- Cameron 2004, p. 332, "It was still another year later when on May 14, 1969 Devvie Herivel, Miss Everett, and Katherine Smith, Miss Marysville, snipped the ribbon of the four-mile stretch across the Snohomish River flats to open a route free of traffic signals and draw bridges, finally linking Canada and California. Harold Walsh, state highways commissioner from Everett was master of ceremonies at the dedication taking place on the new Steamboat Slough bridge.
- Cameron 2004, p. 332, "North if Marysville, where there was already a divided highway, it was mostly the matter of building overpasses along Highway 99 at such places as Island Crossing, Lakewood, and Stimson Crossing."
- An I-5 Bridge Over the Skagit River Has Collapsed, The Stranger, May 23, 2013
- Washington Department of Transportation, State Route Web, accessed October 2007
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