UPDATE 2:30 p.m.
Montana Department of Transportation officials have opened Interstate 90 to two-way traffic in the eastbound lane, with flaggers and pilot cars. No oversize loads allowed, and vehicles maximum 10 feet wide through the area
UPDATE 12:00 noon Monday, March 31
Montana Department of Transportation crews have been working all morning with heavy equipment attempting to clear a large volume of rocks and debris that has blocked the westbound lanes of I-90 approximately 6.5 miles from the top of Lookout Pass.