sentences:  Transitioning from a commercial to residential area, the Mount Vernon campus of the Skagit Valley College, located on the north side of the highway, is passed and eventually SR 538 leaves Mount Vernon city limits.The road turns southeast and ends at a roundabout with within Mount Vernon's urban growth boundary.Originating as a county road by 1911, SR 538 was designated Secondary State Highway 1G (SSH 1G) in 1937.