Both westbound lanes of Interstate 90 four miles south of Hardin were closed Wednesday morning after a semi-truck jack-knifed on the road about 11 a.m.
A press release from the Montana Department of Transportation said the highway would be reopened after a wrecker retrieves the semi.
Traffic was being rerouted to the frontage road at the Hardin and Dunsmore exits.
Brenda Davisson, with the Big Horn County Sheriff's Office, said visibility on I-90 was "next to zero" because of blowing snow.
Will Campbell, a dispatcher with the Montana Highway Patrol, said "it's a disaster down there."