 SSH 1T was created in 1937 during the formation of the primary and secondary state highways, traveling on a route north from Primary State Highway 1 (PSH 1) and U.S. Route 99 (US 99) in Vancouver through Felida and Ridgefield to PSH 1 and US 99 at Pioneer.The highway was extended into Vancouver in the 1950s and re-aligned in 1963 to serve the Port of Vancouver, traveling along the Columbia River to Ridgefield west of Vancouver Lake onto a roadway that was to be constructed.The state highway commission realigned the highway onto a pair of one-way streets within Vancouver in late 1968.