Washington State Route 538
State Route 538 is a 3.62-mile (5.83 km) long state highway located within the northern area of Mount Vernon city limits and the urban growth boundary, located in Skagit County, a subdivision of the U.S. state of Washington. The highway, which has existed as a county road since 1911, travels from Interstate 5 (I-5) in the west, passing former U.S. Route 99 (US 99), now Riverside Drive, and Skagit Valley College's main Mount Vernon campus before terminating at a roundabout with SR 9.
Source: Wikipedia
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