Seattle, Mercer Island, and Bellevue Looking west at the intersection of I-90 and I-5 in downtown Seattle Several proposals to raise the speed limit of the rural section between Vantage and Spokane to 75 mph (121 km/h) have been submitted and denied by the state government due to safety concerns. ![]() The freeway has a maximum speed limit of 60 miles per hour (97 km/h) in urban areas, 65 mph (105 km/h) in mountainous areas, and 70 mph (110 km/h) in rural areas. The highway's least busiest section, near SR 21 west of Ritzville, carried 11,000 vehicles in 2016. A section of I-90 in Bellevue's Eastgate neighborhood carries a daily average of 150,000 vehicles, making it the highway's busiest. I-90 is maintained by the Washington State Department of Transportation (WSDOT), who conduct an annual survey of traffic volume that is expressed in terms of annual average daily traffic (AADT), a measure of traffic volume for any average day of the year. A 100-mile (160 km) section of I-90 between Seattle and Thorp named the Mountains to Sound Greenway was designated in 1998 as a National Scenic Byway, in recognition of its scenic views. The Washington State Legislature designated the highway as the "American Veterans Memorial Highway" in 1991 to honor U.S. It is listed as part of the National Highway System, classifying important to the national economy, defense, and mobility, and the state's Highway of Statewide Significance program, recognizing its connection to major communities. Interstate 90 is the longest freeway in Washington state, at nearly 298 miles (480 km) in length, and is the only Interstate to traverse the state from west to east across the Cascade Mountains. The old bridge's center pontoons sank during a November 1990 windstorm due to a contractor error and were rebuilt over the following three years, reopening to traffic on September 12, 1993, marking the completion of the transcontinental highway. The new floating bridge opened in 1989 and carried bi-directional traffic while the original floating bridge was renovated. A compromise agreement was reached by the federal, state, and local governments in 1976 to build a second floating bridge across Lake Washington and include extensive parks above tunneled sections of I-90, which were completed in the early 1990s. The section of I-90 between Seattle and I-405 in Bellevue was delayed for decades because of environmental concerns and lawsuits by local groups over the freeway's potential impact on nearby neighborhoods. The first segments of the freeway, located in Spokane and Spokane Valley, opened at around the same time and the state government completed upgrades of US 10 to Interstate standards for most of the route by the late 1970s. The Sunset Highway was incorporated into the national highway system in 1926 as part of US 10, which I-90 replaced when it was designated in 1957. The crossing at Snoqualmie Pass was established as a wagon road in 1867 and incorporated into a cross-state auto trail, known as the Sunset Highway, in the early 1910s. The freeway travels across suburban bedroom communities in the Seattle metropolitan area, the forests of the Cascade Range, and the high plains of the Columbia Plateau. I-90 crosses the Cascades at Snoqualmie Pass, one of the busiest mountain pass highways in the United States, and uses a series of viaducts and structures to navigate the terrain. Hadley Memorial Bridge, which cross Lake Washington from Seattle to Mercer Island. It incorporates two of the longest floating bridges in the world, the Lacey V. I-90 is the only Interstate to cross the state from west to east, and the only one to connect the state's two largest cities, Seattle and Spokane. Route 97 (US 97) near Ellensburg, and US 395 and US 2 in Spokane. I-90 intersects several of the state's other major highways, including I-5 in Seattle, I-82 and U.S. It crosses Washington state from west to east, traveling 298 miles (480 km) from Seattle across the Cascade Mountains and into Eastern Washington, reaching the Idaho state line east of Spokane. Interstate 90 ( I-90), designated as the American Veterans Memorial Highway, is a transcontinental Interstate Highway that runs from Seattle, Washington, to Boston, Massachusetts. King, Kittitas, Grant, Adams, Lincoln, Spokane ![]() I-90 at Idaho state line near Liberty Lake
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