A major east-west highway in western Colorado is closed indefinitely after a rock slide in the deep and narrow Glenwood Canyon. The slide occurred Monday night on Interstate 70 about 125 miles east of the Utah border. The Colorado Department of Transportation shut down traffic in both directions along 24 miles of highway, from Glenwood Springs in the west to Gypsum in the east. CDOT spokeswoman Amy Ford said Tuesday officials don’t know when it will reopen. "It could be a long-time closure," she said. The slide damaged a tractor-trailer rig, but no one was injured, Ford said.