U.S. Route 10 Alternate (Washington–Montana)

U.S. Route 10A
U.S. Route 10A
	The 1941 alignment of US 10A highlighted in red and the 1947 alignment of US 10A in blue
Route information
	Auxiliary route of US 10
Length	567 mi (912 km)
Existed	1941–1967
Major junctions
West end	I-90 / US 10 in Coeur d'Alene, ID
	US 95 / US 2 in Sandpoint, ID; US 93 in Ravalli, MT;
East end	I-90 / US 10 in Wye, MT
Location
Country	United States
States	Washington, Idaho, and Montana
Highway system
	United States Numbered Highway System; List; Special; Divided;
	State highways in Washington; Interstate; US; State; Scenic; Pre-1964; 1964 renumbering; Former;
	Idaho State Highway System; Interstate; US; State;
	Montana Highway System; Interstate; US; State; Secondary;

U.S. Route 10A (US 10A) was an alternate route of US 10 that existed between 1941 and 1967. From 1941 to 1947, it ran between Seattle, Washington, and Missoula, Montana. Since its decommissioning, it has been replaced by Idaho State Highway 200 (SH-200), Montana Highway 200 (MT 200), and US 2. By 1947, it had been rerouted to run concurrently with US 95, as the majority of its former route had been replaced by the western extension of US 2 from Bonners Ferry, Idaho, to Everett, Washington. This change led the highway to begin in Coeur d'Alene, Idaho, rather than in Seattle. It would remain in this configuration until its decommissioning in 1967, as I-90 gradually replaced US 10.