First opened in 1964, the highway travels 14 km (9 mi) northwest along the Kootenay River, from its connection with Idaho State Highway 1 at the Rykerts Canada-U.S. border crossing to a point on the Crowsnest Highway just 1 km (about ½ mi) west of Creston.
SH-1 was originally created in the 1920s as part of Sampson Trail B, which ran from Boise north to Lewiston, Coeur d'Alene, before entering British Columbia at Porthill.
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The route serves as a connector between Bonners Ferry, via US-95 south, Porthill, and Creston, BC The highway is one of two border crossings from Idaho into British Columbia.
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Idaho State Highway 1 runs straight through the community and to the Porthill Port of Entry which then turns into British Columbia Highway 21.