Interstate 5 in Washington
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Interstate 5 is highlighted in red
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| Route information | ||||
| Defined by RCW 47.17.020 | ||||
| Maintained by WSDOT | ||||
| Length: | 276.62 mi (445.18 km) | |||
| Existed: | August 7, 1947 by FHWA 1956 – present |
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| Tourist routes: |
Lewis and Clark Highway (from Vancouver to SR-4 near Longview) | |||
| Major junctions | ||||
| South end: |
 I-5 at the Oregon state line |
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 SR 14 in Vancouver I‑205 in Salmon Creek US 12 near Centralia US 101 in Tumwater I‑705 in Tacoma I‑90 in Seattle US 2 in Everett SR 20 in Burlington
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| North end: |
 BC 99 at Canada–United States border in Blaine
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| Location | ||||
| Counties: | Clark, Cowlitz, Lewis, Thurston, Pierce, King, Snohomish, Skagit, Whatcom | |||
| Highway system | ||||
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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 undivided 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.
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 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.
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