Washington State Route 407

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State Route 407 marker

State Route 407
Route information
Auxiliary route of SR 4
Maintained by WSDOT
Existed: 1964 – 1992
Major junctions
West end: WA-4.svg SR 4 in Cathlamet
East end: Elochoman State Forest
Highway system

State Route 407 was a state route in the U.S. state of Washington. It was an auxiliary route of State Route 4. It started at SR 4 and went east to Elochoman State Forest.[1]


In 1964, SSH 12D became SR 407. SR 407 was later removed in 1992.


  1. ^ Highways of Washington State. "Highways of Washington State". Retrieved May 17, 2008.