Next Phase of Work on I-70 Arriba Project to Begin in May

April 22, 2019 -

At the beginning of May, crews will begin work on the next phase of the I-70 Arriba East and West Concrete Overlay Project.

In this phase, westbound I-70 will close between mile points (MP) 379.5 and 395.6 to allow crews to mill, complete full depth reclamation, pave with concrete, overlay the bridge and install guardrail. Traffic will be moved into a head-to-head configuration on the eastbound side of I-70 until the end of October.

Temporary on/off ramps will be used at the Flagler and Arriba interchanges to allow access to I-70. During daytime construction, the ramps will be split with one side being used for general traffic and one side for construction traffic. Speed limits through the work zone will be reduced to 65 mph and, in some locations, 55 mph. Please remember to slow for the cone zone (see tips below).


This $44.6 million project will include concrete paving, hot mix asphalt, bridge overlay, full-depth reclamation and striping. The new pavement and improved cross slopes will provide safer roads for motorists by better draining rain and melting snow. This project is expected to end in fall 2020.

Travel Impacts

Motorists should expect various lane closures on I-70 in the work zone. Typical work hours will be Monday through Friday, 7 a.m. to 7 p.m. Weekend and overnight work may occur as needed. Motorists are asked to please go slow in the cone zone.

Safety Tips

The following tips are to help you stay safe while traveling through maintenance and construction work zones.

  • Do not speed in work zones; obey the posted speed limits.
  • Stay Alert! Expect the unexpected.
  • Watch for workers; drive with caution.
  • Don't change lanes unnecessarily.
  • Avoid using mobile devices such as phones while driving in work zones.
  • Turn on headlights so that workers and other drivers can see you.
  • Be especially alert at night while driving in work zones.
  • Expect delays, especially during peak travel times.
  • Allow ample space between you and the car in front of you.
  • Anticipate lane shifts, and merge when directed to do so.
  • Be patient!


CDOT has approximately 3,000 employees at its Denver headquarters and in regional offices throughout Colorado, and manages more than 23,000 lane miles of highway and 3,429 bridges. CDOT also manages grant partnerships with a range of other agencies including metropolitan planning organizations, local governments, and airports, and administers Bustang, the state-owned and operated interregional express service. Gov. Jared Polis has charged CDOT to further build on the state's intermodal mobility options.