Due to high elevations and prone to heavy mountain snow fall during the winter months, the department closes certain roads during the winter season. Once these roads are closed for the winter season, no winter maintenance is provided and travel on these roads is prohibited. For current statuses on these routes, visit our 511 Travel Information map or download our mobile app, MDT 511.
| Route | Mile Post | Name | County |
|---|---|---|---|
| US-212 | 45 - 56 | Beartooth Highway | Carbon |
| MT-38 | 14 - 38 | Skalkaho Pass | Ravalli - Granite |
| MT-49 | 4 - 11 | Looking Glass Highway | Glacier |
| S-471 | 16 - 22 | Thompson Pass | Sanders |