Interstate 90 in Montana
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| Riverbend North | |
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| Route information | |
| Maintained by MDT | |
| Length: | 554.10 mi (891.74 km) |
| Major junctions | |
| West end: |
 I-90 at Idaho state line |
| East end: |
 I-90 / US 87 at Wyoming state line |
| Location | |
| Counties: | Mineral, Missoula, Granite, Powell, Deer Lodge, Silver Bow, Jefferson, Broadwater, Gallatin, Park, Sweet Grass, Stillwater, Yellowstone, Big Horn |
| Highway system | |
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Interstate 90 in Montana (I-90) is a portion of the east–west transcontinental Interstate 90, which links Seattle, Washington to Boston, Massachusetts. The portion in the US state of Montana is 554.10 miles (891.74 km) long, linking fourteen counties through central and southern Montana.
Interstate 90 enters Montana and Mineral County from Shoshone County, Idaho over the 4,725-foot (1,440 m) high Lookout Pass, which traverses the Coeur d'Alène Mountains of the Bitterroot Range, and immediately has its first interchange, a partial cloverleaf serving extreme northwest Mineral County. The highway continues southeasterly through woodlands, paralleling the St. Regis River, before meeting the Dena Mora (Lookout Pass) rest area 4.7 mi (7.6 km) east of the Idaho–Montana border. About a 1⁄2 mi (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 highway continues, winding through the woodlands until another diamond interchange, serving the small unincorporated community of Saltese. Continuing east for about 6 mi (9.7 km), each direction diverges for a small distance before returning side to side for a diamond interchange serving the unincorporated community of Haugan.
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