Five separate incidents with semi trucks have Bozeman Hill on Interstate 90 at a basic standstill.

Montana Department of Transportation reports other accidents scattered south of Butte, Belgrade and Bozeman.

A jackknife crash is blocking I-90 five miles east of Cardwell exit 256, Montana Department of Transportation reports.

The passing eastbound passing lane is closed.

MDT also reports that chains are required over Norris Hill this morning and a jackknifed semi is blocking the northbound lanes of U.S. 287 near McAllister.

The agency warns that visibility could be low in the area. Emergency crews are on scene.

Reduced speed is advised.