I-70 is currently closed in Glenwood Canyon, due to mudslides in the area of last year's fire. 100 cars were trapped overnight, as you may have seen on the news.
As always, for updates check
cotrip.org
Northern alternate route: Rifle to Craig to Kremmling to Silverthorne.
Southern alternate route: Grand Junction to Montrose, over Monarch Pass, to Poncha Springs to Conifer to Denver. However, US 50 is mostly closed weekdays (limited open times) for rock scaling in Little Blue Creek Canyon (
Home | US 50 Little Blue Creek Improvements).
Detour route: Grand Junction to Delta, CO-92 to Hotchkiss, back to US 50 at the dam (Blue Mesa Reservoir), over Monarch Pass, to Poncha Springs to Conifer to Denver.
Grand Junction to Poncha Springs via Hotchkiss: 202 miles. Montrose to Poncha Springs via Hotchkiss detour: 179 miles.
Fair warning.