UPDATE 5:46 pm: Both westbound and eastbound lanes of I90 are open. Westbound lane is slow due to congestion. PLEASE USE CAUTION AND SLOW DOWN AS BLACK ICE CONTINUES TO BE A HAZARD.
Please avoid I90 between Three Forks and Manhattan. Traffic is currently being diverted off the interstate at the Manhattan exit due to black ice and multiple slide offs.
Original source can be found here.