U.S. Route 410 (US 410) was a U.S. Highway in Washington and Idaho that existed from 1926 to 1967. It ran 469 miles (755 km) from US 101 in Aberdeen, Washington, to US 95 in Lewiston, Idaho, passing through the cities of Olympia, Tacoma, Yakima, the Tri-Cities, and Walla Walla.

Quick Facts Route information, Length ...

U.S. Route 410
US 410 highlighted in red on a modern map
Route information
Auxiliary route of US 10
Length	469 mi[1][citation needed][2] (755 km)
Existed	1926–1967
Major junctions
West end	US 101 in Aberdeen, WA
Major intersections	US 101 near Olympia, WA US 99 in Olympia, WA US 97 in Yakima, WA US 395 in Pasco, WA US 730 near Wallula, WA
East end	US 95 in Lewiston, ID
Location
Country	United States
States	Washington, Idaho
Counties	WA: Grays Harbor, Thurston, Pierce, King, Yakima, Benton, Franklin, Walla Walla, Columbia, Garfield, Asotin ID: Nez Perce
Highway system
United States Numbered Highway System List Special Divided
← US 401 → US 411

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The highway had concurrencies with SR 8, US 99, and US 395. Even though the number indicates that US 410 was a spur of US 10, US 410 never connected with US 10, which is the same case with US 830 and US 30, although like the latter pair, they ran parallel in close proximity. When US 12 was extended into Washington in 1967, US 410 was decommissioned.

US 410 was a spur of US 10 that traveled between Aberdeen, Washington and Lewiston, Idaho. Much of the route was renumbered to U.S. Route 12.^[3]

This section needs additional citations for verification. (May 2018)

US 410 was an original U.S. Highway. It was established in 1926 and decommissioned in 1967 when US 12 was extended into Washington.^[3] The Chinook Pass section was completed in 1931 and dedicated on July 2, 1932; it was named the Mather Memorial Highway for conservationist Stephen Mather.^[6][7]

US 410 is now separated into six different highways including the concurrences with US 101 and US 99. From US 101 to Elma, Washington, US 410 became part of US 12. From Elma, Washington, to US 101 near Olympia, Washington, US 410 became SR 8. The concurrency with US 101 stayed as part of US 101 for the full length from SR 8 to US 99 (now I-5). From US 101's end to Tacoma, Washington, US 410 became part of US 99, which was replaced by I-5. From Tacoma, Washington, to Sumner, Washington, US 410 became part of SR 167. From Sumner, Washington, to Naches, Washington, US 410 retained its original number, as SR 410. From Naches, Washington, to Lewiston, Idaho, US 410 became US 12.

In 1957, the Washington State Highway Commission applied for an expansion of the Interstate Highway System to cover the entire US 410 corridor, but were rejected.^[8] A second attempt, using a tunneled route under Naches Pass, was made in 1959 and also rejected.^[9]

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