Washington State Route 538

State Route 538
College Way
SR 538 highlighted in red
Route information
Auxiliary route of I-5
Maintained by WSDOT
Length	3.62 mi[1] (5.83 km)
Existed	1964[2]–present
Major junctions
West end	I-5 in Mount Vernon
East end	SR 9 near Mount Vernon
Location
Country	United States
State	Washington
Counties	Skagit
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 536 → SR 539

State Route 538 (SR 538, alternatively named College Way) 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.

Before being designated Secondary State Highway 1G (SSH 1G) in 1937, the current roadway that is now SR 538 was a county road through farmland for 26 years. SSH 1G traveled between Primary State Highway 1 (PSH 1), also known as US 99, and SSH 1A until 1964, when the current designation of SR 538 was created. US 99 was bypassed by I-5 after 1966 and became Riverside Drive. The roundabout at SR 9 was constructed in 2007 while the Riverside Drive intersection was widened in 2009.