Repairs underway on I-70 Frontage Road at Mamm Creek, Exit 94 East of Rifle

August 14, 2012 - Northwestern Colorado/CDOT Region 3 - GARFIELD COUNTY – The Colorado Department of Transportation has begun an emergency repair project to restore the I-70 Frontage Road east of the main interchange at Rife (Exit 87).

On the morning of July 24, an overnight thunderstorm washed out the culvert under the I-70 Frontage Road at the Exit 94 interchange (Mamm Creek) just east of Rifle. The north-side Frontage Road (also known as Garfield County Road 316) serves commercial and private landowners and several natural gas wells.

A temporary access to the frontage road from the I-70 Exit 94 westbound on-ramp was constructed to restore access to private property and a gravel pit west of the washout on the frontage road.

The project was advertised under emergency contracting procedures and a contract of $359,000 was awarded to American West of Denver. The contract includes a “liquidated savings specification” to encourage an expedited completion. Essentially what this means is that American West will receive $800 a day for each day ahead of the scheduled October 22 completion date.

Key to the project schedule is the off-site fabrication—and delivery—of concrete box culverts. The work also involves the installation of these three 10-foot by 12-foot concrete box culverts to replace the 10-foot diameter corrugated steel culvert that has failed, as well as embankment work, roadway repairs and resurfacing.

For information on other CDOT projects, the public may log onto, call 511 from anywhere in the state, or sign up for text/e-mail alerts by going to and choosing the green cell phone icon in the upper right corner of the page.