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Interstate Highways in Washington
State highways in Washington
Lists: current - Interstates - 1937-70 - 1964 renumbering

This is a list of Interstate Highways in Washington, all of which are owned and maintained by the U.S. state of Washington. The Washington State Department of Transportation (WSDOT) is the state agency responsible for the day-to-day maintenance and operations of the Interstate Highways in Washington. The Interstate Highway System in Washington covers 771.83 miles (1,242.1 km) and consists of three primary routes and six auxiliary routes. The Interstate Highway with the longest segment in Washington is Interstate 90 at 296.92 miles (477.8 km). The shortest Interstate Highway in the state is Interstate 705 at 1.50 miles (2.4 km).[1]

The construction of the Interstate Highway System in Washington actually began well before these routes were designated as Interstate Highways. Interstates 5, 90, 82, and 405 were part of Washington's primary and secondary highway system that exisited from 1937 to 1970. Planning is ongoing for a proposed bypass around Seattle called Interstate 605. The route is planned to be a length of 40 miles (64.4 km).


Contents

[edit] Primary Interstate Highways

Highway Location Length Description Date established Notes
I-5 Clark, Cowlitz, Lewis, Thurston, Pierce, King, Snohomish County, Skagit, and Whatcom counties 276.62 miles (445.2 km) I-5 starts on the Interstate Bridge over the Columbia River at the Oregon state line in Vancouver. Then, I-5 goes north through Western Washington intersecting Interstate 205, U.S. Routes 12, and 101 before reaching Tacoma. In Tacoma, Interstate 5 intersects with I-705 and moves north to Seattle, after intersecting I-405. In Seattle, I-5 intersects with the second exit of Interstate 90, the longest Interstate in Washington and the United States. Next, the route traverses Snohomish County and intersects I-405 again and US 2 before going north to Blaine where at the Peace Arch on the Canadian border where it enters Canada and becomes British Columbia Route 99, a tribute to U.S. Route 99, the former US route that traversed the current I-5's route. August 7, 1947 [2][3][4]
I-82 Kittitas, Yakima, and Benton counties 132.57 miles (213.4 km) I-82 begins at an interchange with I-90 and travels concurrently with US 97 southwest to Yakima, where it starts its concurrency with US 12 and ends its concurrency with US 97. Then, the route moves southwest to the Tri-Cities where I-82 intersects its auxiliary route, I-182 and splits off of US 12 and joins US 395, before going over the Columbia River to Oregon. 1947 [5][6]
I-90 King, Kittitas, Grant, Adams, Lincoln, and Spokane counties 296.92 miles (477.8 km) I-90 starts in Seattle at an interchange with SR 519. Then, it intersects I-5 before going across Lake Washington to intersect I-405 in Bellevue. After the intersection, I-90 passes Snoqualmie Pass to reach Ellensburg, where it intersects US 97 and I-82. After going even more east, I-90 goes northeast to be joined by US 395 and US 2 before entering Spokane and leaving to Idaho. 1947 [7][8][9]

[edit] Auxiliary Interstate Highways

[edit] Auxiliary routes of Interstate 5

Highway Location Length Description Date established Notes
I-205 Clark County 10.57 miles (17.0 km) I-205 starts on the Glenn L. Jackson Memorial Bridge over the Columbia River at the Oregon state line in Vancouver. From Vancouver, I-205 goes northwest to I-5 in Salmon Creek. Unknown [10][11]
I-405 King and Snohomish counties 30.30 miles (48.8 km) I-405 starts at I-5 near the SeaTac International Airport in Tukwila. I-405 goes east to Renton, where it intersects with SR 167. Then, it goes north to Bellevue, where it intersects I-90 and SR 520 before going northwest to I-5 in Lynnwood. 1964 [12][13][14]
I-605 King and Snohomish counties Unknown I-605 is a proposed bypass to I-405 and I-5. Proposed [15]
I-705 Pierce County 1.50 miles (2.4 km) I-705 begins at I-5/SR 7 and goes north to the Schuster Parkway. 1979 [16][17]

[edit] Auxiliary routes of Interstate 82

Highway Location Length Description Date established Notes
I-182 Clark County 15.19 miles (24.4 km) I-182 starts at I-82/US 12 near the Tri-Cities before joining US 12 and going east to Pasco, where the freeway ends at the US 395/US 12 interchange. 1986 [18][19]

[edit] References

Part of the series on
Highways in Washington
Interstates
U.S. routes
State highways
Former Primary State Highways
  1. ^ Washington State Department of Transportation, State Route Web
  2. ^ Highways of Washington State. Interstate 5. Retrieved on 2008-06-01.
  3. ^ Google Maps. Interstate 5 South Map. Retrieved on 2008-06-01.
  4. ^ Google Maps. Interstate 5 North Map. Retrieved on 2008-06-01.
  5. ^ Highways of Washington State. Interstate 82. Retrieved on 2008-06-01.
  6. ^ Google Maps. Interstate 82 Map. Retrieved on 2008-06-01.
  7. ^ Highways of Washington State. Interstate 90. Retrieved on 2008-06-01.
  8. ^ Google Maps. Interstate 90 West Map. Retrieved on 2008-06-01.
  9. ^ Google Maps. Interstate 90 East Map. Retrieved on 2008-06-01.
  10. ^ Highways of Washington State. Interstate 205. Retrieved on 2008-06-01.
  11. ^ Google Maps. Interstate 205 Map. Retrieved on 2008-06-01.
  12. ^ Highways of Washington State. Interstate 405. Retrieved on 2008-06-01.
  13. ^ Google Maps. Interstate 405 South Map. Retrieved on 2008-06-01.
  14. ^ Google Maps. Interstate 405 North Map. Retrieved on 2008-06-01.
  15. ^ Highways of Washington State. Interstate 605. Retrieved on 2008-06-01.
  16. ^ Highways of Washington State. Interstate 705. Retrieved on 2008-06-01.
  17. ^ Google Maps. Interstate 705 Map. Retrieved on 2008-06-01.
  18. ^ Highways of Washington State. Interstate 182. Retrieved on 2008-06-01.
  19. ^ Google Maps. Interstate 182 Map. Retrieved on 2008-06-01.
v • d • e
Blank US Interstate Highway shield Interstates in Washington

I-5    I-82    I-90    I-182    I-205    I-405    I-605    I-705
Proprosed highways shown in italics