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I-82 / US 395 at Oregon state line near Plymouth: 1957 [30] current Serves the Yakima Valley and Tri-Cities regions and was completed in 1986. [42] I-90: 297.51: 478.80 SR 519 in Seattle: I-90 at Idaho state line near Liberty Lake: 1957 [26] current Main east–west corridor in Washington and the longest Interstate, completed in 1993. [48]
I-205 functions primarily as a bypass of I-5 in the Portland metropolitan area, and serves Vancouver, Washington, and the eastern suburban areas of Portland, Oregon. [4] It is listed as part of the National Highway System, which identifies routes that are important to the national economy, defense, and mobility, and Washington state recognizes it as a Highway of Statewide Significance.
U.S. Route 101 (US 101), is a major north–south U.S. Highway in Oregon that runs through the state along the western Oregon coastline near the Pacific Ocean. It runs from the California border, south of Brookings, to the Washington state line on the Columbia River, between Astoria, Oregon, and Megler, Washington.
I-5 at the California state line: I-5 at the Washington state line 1957: current I-80N: 375.17: 603.78 I-5 / US 30 in Portland: I-80N at the Idaho state line 1957: 1980 Renumbered to I-84 I-82: 11.01: 17.72 I-82 at the Washington state line: I-84 / US 30 in Umatilla County: 1957: current I-84: 375.17: 603.78 I-5 / US 30 in Portland
State Route 14 (SR 14) is a 180.66-mile-long (290.74 km) state highway in the U.S. state of Washington. The highway travels east-west on the north side of the Columbia River, opposite Interstate 84 (I-84) to the south in Oregon. SR 14 forms a section of the Lewis and Clark Trail Scenic Byway and begins at an interchange with I-5 in Vancouver.
The wide main channel of the Columbia (and the Washington–Oregon state line) passes north of the island. To the south, sheltered by the island, is a smaller channel known as North Portland Harbor. Much of Hayden Island (and connected Tomahawk Island to the east) is within Portland city limits, and recognized as one of its 95 neighborhoods. [2]
Interstate 5 (I-5) is an Interstate Highway on the West Coast of the United States that serves as the region's primary north–south route. It spans 277 miles (446 km) across the state of Washington, from the Oregon state border at Vancouver, through the Puget Sound region, to the Canadian border at Blaine.
All state highways are designated by the Washington State Legislature and codified in the Revised Code of Washington (RCW), namely Chapter 47.17 RCW. These routes are defined generally by termini and points along the route; WSDOT may otherwise choose the details, and may bypass the designated points as long as the road serves the general vicinity.