From the CDOT website:
I-70 will be CLOSED in Glenwood Canyon in both directions (Mile Marker 116-133) Wednesday and Thursday (July 27-28), 9:00 a.m. to 3:30 p.m., for rockfall mitigation work. Preferred Alternate Routes: US 40 to CO 13; US 285 to US 50. (Note: CO 131 has an 8-foot width restriction due to bridge work) CO 82 Independence Pass is viable for passenger vehicles but no CMVs or vehicles over 35 feet long are permitted on the pass.
https://www.codot.gov/news/2016-news-releases/07-2016/i-70-glenwood-canyon-closed-july-27-28-for-rockfall-mitigation-helicopter-operations
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