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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.
The Idaho Transportation Department (ITD) is responsible for the establishment and classification of a state highway network, including 5,000 miles (8,000 km) of roads that are classified as Interstate Highways, U.S. Highways, and state highways within the state of Idaho in the United States. [1]
Interstate 15 (I-15) is a part of the Interstate Highway System that runs from San Diego, California, to Sweetgrass, Montana.In Idaho, the Interstate Highway runs exactly 196 miles (315 km) from the Utah state line near Woodruff north to the Montana state line at Monida Pass.
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.
The highway continues southeasterly through woodlands, paralleling the St. Regis River, before meeting the Dena Mora (Lookout Pass) rest area 4.7 miles (7.6 km) east of the Idaho–Montana border. [3] About 0.5 miles (0.80 km) from the rest stop is a diamond interchange, serving a small minor road into the St. Joe National Forest in Idaho.
The route has remained mostly unchanged from its original routing, except to expand lanes or straighten and widen some narrow sections. The most notable reroutings from the original corridor are: 1) the section from Moyie Springs, Idaho, to just inside the Montana border, which once ran much further north, as seen on the 1937 map of the area [3] (Old US 2N intersects today's US 2 about 2.6 ...