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U.S. Highway 12 (US 12) is an east–west United States Numbered Highway in the state of Montana.It extends approximately 597.576 miles (961.705 km) from the Idaho state line east to the North Dakota state line, the greatest distance that US 12 traverses through any state.
Montana's secondary system was established in 1942, [4] but secondary highways (S routes) were not signed until the 1960s. [1] S route designations first appeared on the state highway map in 1960 [5] and are abbreviated as "S-nnn". Route numbers 201 and higher are, with very few exceptions, exclusively reserved for S routes.
U.S. Route 12 or U.S. Highway 12 (US 12) is an east–west United States Numbered Highway, running from Aberdeen, Washington, to Detroit, Michigan, for almost 2,500 miles (4,000 km). The highway has mostly been superseded by Interstate 90 (I-90) and I-94 , but, unlike most U.S. Highways that have been superseded by an Interstate , US 12 remains ...
U.S. Route 212 (US 212) is a spur of US 12. It runs for 949 miles (1,527 km) from Yellowstone National Park to Minnesota Highway 62 at Edina, Minnesota. It does not intersect US 12 now, but it once had an eastern terminus at US 12 in St. Paul, Minnesota. US 212 passes through the states of Minnesota, South Dakota, Wyoming, and Montana.
US 12 in Billings: US 212 at Broadus: 1959: 1981 Replaced by MT 59 and US 10: US 789 — — Wyoming state line near Frannie: Canadian Border near Sweetgrass — — Proposed, but never commissioned; would have followed (south to north) US 310, US 10/US 212, US 87, US 91
Secondary highways first appeared on the state highway map in 1960, [1] even though the secondary system was established in 1942. [2] With very few exceptions, notably MT 287 and the former MT 789, Montana state highways numbered 201 and higher are secondary highways. North on S-486 in Columbia Falls, August 2013
At its southern end, MT 3 begins at I-90 in Billings and travels northwest 47 miles (76 km) to US 12 near Lavina – this is the only section of MT 3 that is not concurrent with a US highway. MT 3 joins US 12 and travels 45 miles (72 km) west to Harlowton , where it leaves US 12 and joins US 191 , and travels north for 39 miles (63 km) to Eddie ...
Route 12 follows the Lochsa River along its north bank. [9] One of the last two-lane U.S. highways constructed, it was completed in the early 1960s, connecting Lewiston with Missoula over Lolo Pass. Two railroads, the Northern Pacific and Union Pacific , had originally planned to ascend the Lochsa; the Northern won the rights and even completed ...