US 10 Trunk
US 10 was one of the original US routes of 1926. Originally, US 10 went around the south end of Lake Washington on the way from Seattle to Snoqualmie Pass. From Cle Elum to Spokane, US 10 crossed (Old) Blewett Pass and bridged the Columbia River at Wenatchee. The route was changed to the general corridor now served by I-90 in 1940. US 10 was decertified as a US route from Seattle to Spokane in 1969 and from Spokane to Coeur d'Alene, Idaho in 1975. See the US 10 Trunk page for a detailed description.
Alternate US 10 Seattle-Renton-Issaquah
When the first lake Washington Floating Bridge was opened to traffic in July 1940, the old route of US 10 from Seattle via Renton to Issaquah was redesignated Alternate US 10. This designation was used until the mid 1950s when the route became posted as PSH 2. The route became SR 900 in 1964.
Alternate US 10 Seattle-Everett-Wenatchee-Spokane
When US 10 was moved to the corridor now served by I-90 from the Cle Elum area to Spokane in 1940, the old route of US 10 from the vicinity of Peshastin via Wenatchee to Spokane became Alternate US 10. Alternate US 10 was extended west along PSH 15 via Stevens Pass to Jct US 99 in Everett, then coincident with US 99 to the junction with the US 10 trunk in Seattle. In 1948, the Alternate US 10 designation was replaced by the US 2 designation from Spokane to Everett and dropped from Everett to Seattle.
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