Montana Highway 87
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| Route information | |
| Maintained by MDT | |
| Length: | 8.571 mi (13.794 km) |
| Existed: | October 9, 1922 – present |
| Major junctions | |
| South end: |
 SH 87 at Idaho state line |
| North end: |
 US 287 west of Quake Lake
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| Location | |
| Counties: | Madison |
| Highway system | |
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Montana Highway 87 (MT 87) is a primary state highway located in the southwestern region of the U.S. state of Montana. The highway travels through mainly rural areas in Raynolds Pass, from the Montana–Idaho state line to an intersection with U.S. Route 287 (US 287). The route travels through a portion of Gallatin National Forest. In 1922, a road in the location of MT 87 was added to the highway system, and a few years later the road was designated as portions of two early auto trails. In 1959, the route was rapidly improved due to the collapse of US 287 nearby. During 1967, much of the highway was reconstructed along its current location.
MT 87 begins at the Montana–Idaho state line, traveling through Raynolds Pass. The highway proceeds northward, intersecting a small road before entering rural areas within Gallatin National Forest. The route continues northeast, intersecting several forest roads before bending northwestward. The route intersects several small roads while it runs parallel to a small creek. It crosses over the Madison River after passing several small buildings. The highway continues northwestward to its northern terminus, an at-grade intersection with US 287. The highway is maintained by the Montana Department of Transportation (MDT). Part of the job of the MDT is to measure traffic along the highway. These counts are taken using a metric called annual average daily traffic (AADT). This is a statistical calculation of the average daily number of vehicles that travel along a portion of the highway. In 2011, the highway had an AADT count of 583 vehicles. No portion of the highway is listed as part of the National Highway System (NHS), a network of roads important to the country's economy, defense, and mobility.
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