The Montana Department of Transportation reports a jackknifed semi has blocked traffic between Gallatin Gateway and Big Sky.
We checked with MDT and the Montana Highway Patrol.
Newly posted information says one lane has been reopened.
The accident closed US-191 to traffic Four Corners, West Yellowstone and MT-64 for about two hours.
The accident happened just before 11:30 a.m. about 8 miles north of the Big Sky spur.