GLENWOOD SPRINGS - A semi truck rolled on the westbound lanes of I-70 at West Glenwood around 2 p.m., blocking both lanes.

The traffic backup has reportedly caused at least one other accident in the westbound lanes of I-70 in Glenwood Canyon.

Westbound traffic is backed up through Glenwood Canyon and to the east, and I-70 is closed at Gypsum. There is no estimated reopening time as of 5:30 p.m. Monday.