List of U.S. Routes in Washington explained

U.S. Routes in Washington
Shields:	State: WA Type: US 1926 Route: 10 State: WA Type: US 1961 Route: 99 State: WA Type: US Route: 101
Caption:	Highway markers in different years for former U.S. Route 10 (1926), former U.S. Route 99 (1961), and current U.S. Route 101 (1970)
Map:	US Routes in Washington.svg
Map Notes:	The state highway system of Washington, with U.S. routes highlighted in red.
Formed:	November 11, 1926^[1]
Us:	U.S. Route nn (US nn)
Label1:	Alternate Routes
Field1:	U.S. Route nn Alternate (US nn Alt)
Label2:	Spur Routes
Field2:	U.S. Route nn Spur (US nn Spur)
Notes:	Maintained by WSDOT
Links:	WA

The U.S. Routes in Washington are segments of the United States Numbered Highway System that are owned and maintained by the U.S. state of Washington through the Washington State Department of Transportation (WSDOT). The United States Numbered Highway System in Washington covers 1870miles and consists of eight highways, divided into four primary routes and four auxiliary routes.

The United States Numbered Highway System was approved and established on November 11, 1926 by the American Association of State Highway Officials (AASHO) and included eleven routes traveling through Washington.^{[1] [2]}

In 1961, the state introduced a set of route markers in Olympia that were colored based on destination and direction rather than route.^[3]

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External links

• Highways of Washington State

Notes and References

1. Web site: Weingroff . Richard F. . From Names to Numbers: The Origins of the U.S. Numbered Highway System . January 9, 2009 . Highway History . . July 21, 2015.
2. . . November 11, 1926 . United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials . 1:7,000,000 . Washington, DC . . 32889555 . November 7, 2013 . . amp.
3. News: July 11, 1961 . Highway Hues . 4 . . . July 4, 2023.