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I-15, 20 miles (32 km) south of Dillon, Montana I-15 (foreground left to right) goes through the city of Great Falls, MT. I-15 crosses into Montana from Idaho just south of Lima Reservoir over Monida Pass, at 6,870 feet (2,090 m), the highest elevation on the entire route of I-15. [2] The route continues northwest through farmland and desert.
A particularly well-known example of exposed Belt Group mudstones in alternating purplish-red or pale bluish-green layers in the Big Belt Mountains is in Wolf Creek Canyon along Interstate 15 between Helena and Great Falls.
Rogers Pass is a mountain pass that rises 5,610 feet (1,710 m) above sea level and is located on the Continental Divide in the U.S. state of Montana. [1] The pass is adjacent to Helena National Forest and is traversed by Montana Highway 200, providing the shortest route between the cities of Great Falls and Missoula, Montana.
Interstate 15 (I-15) is a major Interstate Highway in the Western United States, running through Southern California and the Intermountain West.I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Canada, passing through the states of California, Nevada, Arizona, Utah, Idaho, and Montana.
The Sleeping Giant wilderness study area is an important habitat for mountain goats. The Sleeping Giant region is a roughly rectangular area bounded by Interstate 15 on the west and Holter Lake on the east, the south boundary runs from the Hilger Valley to the Ming Bar , and the north boundary runs from the northern edge of the Oxbow Bend of Holter Lake to Interstate 15.
The four highways continue 23 miles (37 km) to Great Falls, where it follows a 0.8-mile (1.3 km) concurrency with I-315 and ends at I-15. [1] [3] MT 3 is part of the Camino Real Corridor (Corridor 27), a High Priority Corridor that connects El Paso, Texas to the Canada–United States border at Sweet Grass, Montana.
US 287 heads north for 30 miles (48 km) to Townsend, where it merges with US 12, and the two routes travel northwest for 44 miles (71 km) to Helena. On the east side of Helena, the combined route intersects I-15 , where US 287 continues north on I-15 and US 12 heads west through downtown Helena.
The route links I-15 (which bypasses downtown Great Falls to the west) with the center of Great Falls. As its business loop designation implies, I-15 Bus. terminates at I-15 ( running concurrently with US Highway 89 , or US 89, and Montana Highway 200 , or MT 200, through western Great Falls) at each end.