Montana Highway 1
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| Route information | |
| Maintained by MDT | |
| Length: | 63.652 mi (102.438 km) |
| Existed: | October 9, 1922 – present |
| Major junctions | |
| South end: |
 I‑90 in Opportunity
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 MT 48 in Anaconda MT 38 in Porter's Corner
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| North end: |
I‑90 in Drummond
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| Location | |
| Counties: | Deer Lodge, Granite |
| Highway system | |
→
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| Location: | Opportunity–Drummond |
| Length: | 63.5 mi (102.2 km) |
| Existed: | c. 1937–c. 1986 |
Montana State Highway 1 (MT 1) is a state highway located in southwestern Montana, extending west and north from Opportunity to Drummond. Midway between these two points is the Grant-Kohrs Ranch, an historic site. Both the beginning and endpoints of the road are on Interstate 90. It is known as the Pintler Scenic Loop and receives a lot of tourist travel every year to visit the historic mining towns of Philipsburg and Granite and to visit the Georgetown Lake and Discovery Ski Area.
This road was formerly designated as U.S. Highway 10 Alternate (US 10 ALT). It received its current number after US 10 was decommissioned through the area in 1986.
MT 1 was first designated on October 9, 1922, near its present location. By 1924, its route had been designated as part of the National Parks Highway Auto Trail. This route followed the general path of MT 1, traveling from Opportunity through Anaconda and Philipsburg to Drummond. The overall length of the routing was approximately 76 miles (122 km), and was generally an unimproved dirt road. By the next year, the National Parks Highway had been rerouted away from this route. The unsigned MT 1 had been rerouted, now with an overall length of approximately 78 miles (126 km). Also by 1925, the portion of MT 1 traveling from its southern terminus to Anaconda had been paved. Also, the section of the highway near the town of Brown traveling to Stone had been graded, while the rest of the route remained unimproved dirt. By at least 1927, MT 1 had been rerouted, with an overall length of approximately 71 miles (114 km), and the portion of the highway traveling from Stone to its northern terminus had been graded. At least two years later, the entire length of the route had been graded. In 1934, the portion of MT 1 that traveled from modern-day milepost 24.190 to the Deer Lodge–Granite County border was reconstructed along its current route.
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