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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".
The passing of the Federal-Aid Highway Act of 1956 gave major funding to the department and required it to be greatly expanded. In 1957, the four districts were replaced with five districts. The department moved to a new Highway Complex in 1978. In 1991, the Highway Department was reorganized and became the Montana Department of Transportation.
The U.S. Highways in Montana are the segments of the United States Numbered Highway System owned and maintained by the Montana Department of Transportation (MDT) in the U.S. state of Montana. Mainline highways
Local map of Big Hole Pass. Big Hole Pass (elevation: 7,055 feet (2,150 m)) is a high mountain pass in the northern Rocky Mountains of the western United States.It is on the Montana–Idaho border, approximately eight miles (13 km) due south of Montana State Highway 43 in the Beaverhead–Deerlodge National Forest in Beaverhead County, Montana, [1] and Salmon National Forest in Lemhi County ...
Number Length (mi) [3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed I-15: 396.03: 637.35 I-15 near Monida: Hwy 4 at Sweetgrass: I-90: 551.68
US 287 was originally designated as Montana State Highway 287 (MT 287). The Montana State Highway Commission first assigned the MT 287 designation in 1958 to a cross-state route from Yellowstone National Park at West Yellowstone to the Canada–United States border at the Piegan–Carway Border Crossing between Babb and Cardston, Alberta.
U.S. Highway 191 (US 191) is a north-south United States Numbered Highway in the state of Montana. It extends approximately 442.2 miles (711.7 km) from Yellowstone National Park north to the Canadian border .
U.S. Highway 2 (US 2) is an east–west United States Numbered Highway in the state of Montana. It extends approximately 666.645 miles (1,072.861 km) from the Idaho state line east to the North Dakota state line.