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

U.S. Route 10A
	1941 alignment of US 10A highlighted in red; 1947 alignment of US 10A in blue
Route information
	Auxiliary route of US 10
Length	567 mi[1][lower-alpha 1] (912 km)
Existed	1941–1967
Major intersections (in 1944)
West end	US 10 / US 99 in Seattle, WA
	US 99 in Everett, WA; US 10 / US 395 in Spokane, WA; US 95 in Sandpoint, ID; US 93 in Ravalli, MT;
East end	US 10 in Wye, MT
Location
States	Washington, Idaho, and Montana
Highway system
	United States Numbered Highway System; List; Special; Divided; State highways in Washington; Interstate; U.S.; State; Scenic; Former PSH; 1964 renumbering; Former; State Highways in Idaho; Interstate; U.S.; State; Montana Highway System; Interstate; U.S.; State; Secondary;

U.S. Route 10 Alternate (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. It has since been replaced by Idaho State Highway 200, Montana State Highway 200, and US 2. By 1947,[2] it had been rerouted to run concurrently with US 95 as the majority of its former route from Sandpoint to Seattle had been replaced by US 2. 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.[3]

Route description

Washington

US 10A spilt from US 10 in Seattle. The highway would then follow US 99 (modern Washington State Route 99) north to Everett. There it separated from US 99. It then traveled east across the Cascade Mountains via Stevens Pass to central Washington. In Spokane, the highway followed US 195 to Sandpoint, Idaho.

Idaho

A view of Lake Pend Oreille from US 10A (Now Idaho State Highway 200)

In Idaho, US 10A went through Bonner County and the town of Sandpoint. In Sandpoint, US 10A intersected US 95. At the intersection, US 195 terminated and US 10A would follow the shore of Lake Pend Oreille and go into Montana.

1947 reroute

After its reroute in 1947, US 10A started in Coeur d'Alene, Idaho concurrent with US 95. It would follow US 95 north to Sandpoint, Idaho. At the intersection with US 2, US 10A spilt from US 95 and went east towards Clark Fork, Idaho.

Montana

In Montana, the route would then follow through rural northwestern Montana and the towns of Plains and Thompson Falls. It then intersected US 93 in Ravalli, Montana. It then ran concurrently with US 93 south to Wye, Montana, where US 10A ended at Desmet Junction intersecting US 10 and US 93.

History

The intersection with US 95 in the early 1920s

US 10A was formed in 1941, as a alternate route of US 10 going through northwestern Montana, northern Idaho, and central Washington. In Washington, it would follow the former route of US 10 before it was rerouted in 1939.[4] It served as an artery to isolated communities in those states, such as Clark Fork, Idaho, Plains, Montana, as well as several small towns in central Washington.

In 1946, representatives of the highway departments of Idaho and Washington proposed an extension of US 2 to Everett that was considered by the American Association of State Highway Officials's U.S. Route Numbering Committee in January 1946, however the committee vetoed the proposal. The proposal resurfaced during the committee's meeting on December 20, 1946, and US 2 was approved as a replacement for US 10A from Everett to Sandpoint and US 195 from Spokane to Newport. In 1947, following the extension of US 2, US 10A was rerouted to start in Coeur d'Alene along US 95.

The expansion of I-90 contributed to the eventual decommissioning of US 10A.

US 10A was decommissioned in 1967, as its parent route, US 10, was being replaced by Interstate 90 (I-90). After its decommissioning, the states of Idaho and Montana had replaced the former US 10A route with state highways. Montana extended State Highway 20 to replace US 10A in 1967, while also renumbering the highway to 200. Idaho established State Highway 200 to replace US 10A a year later. Both highways were a part of a series of similarly numbered routes in Minnesota and North Dakota with the end goal being a unified federal designation.[5]

Major intersections

State	County	Location	Destinations	Notes
Washington	King	Seattle	US 10 / US 99	Western end of US 99 concurrency; western terminus
	Snohomish	Everett	US 99	Eastern end of US 99 concurrency
	Chelan	Peshastin	US 97 / PSH 2	Western end of US 97 and PSH 2 concurrency
	Chelan	Wenatchee	US 97	Eastern end of US 97 concurrency
	Spokane	Spokane	US 10 / US 395 / US 195 / PSH 2	Western end of US 195 concurrency; eastern end of PSH 2 concurrency
	Pend Oreille	Newport	PSH 6	PSH 6 became State Route 20 in 1964[6]
Idaho	Bonner	Sandpoint	US 95 / US 195	Eastern end of US 195 concurrency; eastern terminus of US 195
Montana	Sanders	Plains	MT 28
	Lake	Ravalli	US 93	Western end of US 93 concurrency
	Missoula	Wye	US 10 / US 93	Eastern terminus; Eastern end of US 93 concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus

1947 rerouting

State	County	Location	Destinations	Notes
Idaho	Kootenai	Coeur d’Alene	I-90 / US 10	Southern end of US 95 concurrency; western terminus
Idaho	Bonner	Sandpoint	US 95 / US 2	Northern end of US 95 concurrency
Montana	Sanders	Plains	MT 28
	Lake	Ravalli	US 93	Western end of US 93 concurrency
	Missoula	Wye	I-90 / US 10 / US 93[7]	Eastern terminus; eastern end of US 93 concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus

Notes

The length after the 1947 reroute was 223 miles (359 km).

References

State Farm Insurance Companies Travel Bureau (1944). "State Farm Road Map: United States" (Map). State Farm Road Atlas United States Canada Mexico. 1:8,680,000. Chicago: Rand McNally. pp. 16–17. Retrieved September 6, 2020 – via David Rumsey Map Collection.
Weingroff, Richard (June 27, 2017). "U.S. 2: Houlton, Maine, to Everett, Washington". Highway History. Federal Highway Administration. Retrieved September 6, 2020.
Idaho Department of Highways; Rand McNally & Co. (1967). Official Highway Map of Idaho (Map). c. 1:1,425,600. Boise: Idaho Department of Highways. Retrieved September 6, 2020 – via Flickr.
Highways of the State of Washington (DJVU) (Map). Department of Highways. 1939. Retrieved November 2, 2020.
"New Map Changes Route 20". The Havre Daily News. October 18, 1967. p. 4. Retrieved November 9, 2020 – via Newspapers.com. The ultimate goal of the highway association, Belding said, is federal designation.
Prahl, C. G. (December 1, 1965). "Identification of State Highways" (PDF). Washington State Highway Commission. Retrieved October 23, 2020.
Montana State Highway Commission; Rand McNally and Co. (1959). Map of the Montana State Highway System (PDF) (Map). Helena: Montana State Highway Commission. Retrieved October 30, 2020.

External links

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[2] The length after the 1947 reroute was 223 miles (359 km).

[1] State Farm Insurance Companies Travel Bureau (1944). "State Farm Road Map: United States" (Map). State Farm Road Atlas United States Canada Mexico. 1:8,680,000. Chicago: Rand McNally. pp. 16–17. Retrieved September 6, 2020 – via David Rumsey Map Collection.

[3] Weingroff, Richard (June 27, 2017). "U.S. 2: Houlton, Maine, to Everett, Washington". Highway History. Federal Highway Administration. Retrieved September 6, 2020.

[4] Idaho Department of Highways; Rand McNally & Co. (1967). Official Highway Map of Idaho (Map). c. 1:1,425,600. Boise: Idaho Department of Highways. Retrieved September 6, 2020 – via Flickr.

[WDH-1939-5] Highways of the State of Washington (DJVU) (Map). Department of Highways. 1939. Retrieved November 2, 2020.

[6] "New Map Changes Route 20". The Havre Daily News. October 18, 1967. p. 4. Retrieved November 9, 2020 – via Newspapers.com. The ultimate goal of the highway association, Belding said, is federal designation.

[7] Prahl, C. G. (December 1, 1965). "Identification of State Highways" (PDF). Washington State Highway Commission. Retrieved October 23, 2020.

[8] Montana State Highway Commission; Rand McNally and Co. (1959). Map of the Montana State Highway System (PDF) (Map). Helena: Montana State Highway Commission. Retrieved October 30, 2020.