U.S. Route 20 in Montana
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| Route information | |
| Maintained by MDT | |
| Length: | 9.680 mi (15.578 km) |
| Major junctions | |
| West end: |
 US 20 at the Idaho state line |
| East end: |
  US 20 / US 191 / US 287 at the Yellowstone National Park west entrance |
| Location | |
| Counties: | Gallatin |
| Highway system | |
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U.S. Route 20 (US 20) is a west-east highway that travels from Targhee Pass at the Idaho state line to the west portion of Yellowstone National Park at the Wyoming state line.
US 20 enters Montana from Idaho at Targhee Pass at the Continental Divide. From there, it curves north and east down the mountain along a tree-lined, two-lane highway with a westbound climbing lane. An access road to the north provides access to Hebgen Lake. The highway then continues through Yellowstone National Park to Wyoming.
The entire route is in Gallatin County.
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Wikipedia