History
US 12 was created in 1925 as part of the original system of United States highways. Its original western terminus was in Miles City, Montana. In 1962, the highway was extended west to Lewiston, ending at the former US 410. In 1967, it was extended to its current western terminus in Aberdeen, Washington, with the Idaho section taking its current route.
The Lewis and Clark Highway, from Lewiston eastward to Lolo Pass, was designated State Route 9 in 1916 and construction began in 1920. Federal prison labor was used in the late 1930s and Japanese internment labor was used during World War II, working out of the camp six miles (10 km) upstream of Lowell. By the fall of 1955, 27 miles (43 km) remained unfinished. Upon its completion in 1962, it was redesignated US 12.
Read more about this topic: U.S. Route 12 In Idaho
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