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Relief map of Montana. The state's topography is roughly defined by the Continental Divide, which splits much of the state into distinct eastern and western regions. [4] Most of Montana's hundred or more named mountain ranges are in the state's western half, most of which is geologically and geographically part of the northern Rocky Mountains.
Oil Company highway maps from the late 1960s and early 1970s show "Tobacco Root Mountains" in the north, and "Jefferson Range" in the south (northwest of Ennis and north of Virginia City). Preliminary topographic maps of the area (Bureau of Reclamation, Missouri Basin Project) from 1947 to 1948 show Jefferson Range, but on the 1950 15-minute ...
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.
This is a list of mountain ranges in the state of Montana. Montana is the fourth largest state in the United States and is well known for its mountains. The name "Montana" is Spanish for "Mountain". Representative James Mitchell Ashley (R-Ohio), suggested the name when legislation organizing the territory was passed by the United States ...
The topographic elevation of a summit measures the height of the summit above a geodetic sea level. [2] [3] The first table below ranks the 50 highest major summits of Montana by elevation. The topographic prominence of a summit is a measure of how high the summit rises above its surroundings.
The road over the pass connects the towns of Hamilton in the Bitterroot Valley and Philipsburg in Flint Creek Valley and remains the only direct route between these two important agricultural areas. Originally an Indian route, Highway 38 was built in 1924 to link mountainous mining areas with the agricultural settlements in the valleys.
US 212 near Alzada: 1939: current US 287: 282: 454 Yellowstone National Park entrance at West Yellowstone: US 89 at Choteau: 1965: current US 310: 55: 89 US 310/WYO 789 near Frannie, WY
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