I-70 Auxiliary Lanes Summit County

About the Project:

Work has begin on the I-70 Auxiliary Lane Project from Frisco to Silverthorne (MP 202 to MP 207). Also at the interchange of I-70 and US 6 and CO 9. Work is expected to go through September of 2023, weather permitting.


Type of Work:

  • Widening the road in the construction zone
  • Repaving eastbound lanes in the construction zone and restriping  
  • Widening of bridges over US 6 and the Blue River; upgrades to drainage
  • Deer fencing in both directions of I-70 (MP 203 to 205)
  • Improved truck parking at the EB scenic overlook
  • Longer deceleration lane and improved signage at the exit 205 off-ramp

Work Schedule & Traffic Impacts

  • Hours of daytime work will be from 7 a.m. to 5:30 p.m., Monday through Friday (minimal impacts after noon on Fridays). Nighttime work will be from 8:00 p.m. to 6:00 a.m., Sunday through Saturday.
  • Motorists should anticipate up to 20-minutes of additional travel time throughout the project work zone.
  • Two eastbound I-70 lanes will remain open through the entirety of the project.
  • Concrete barriers will shift traffic into temporary lanes. Traffic patterns will change based on work.
  • Speeds will be reduced to 55 mph in the work zone.
  • Width restrictions on I-70 will be reduced to 11 feet; US 6 and CO 9 may be reduced to 10 feet.
  • Motorists should anticipate shorter lanes when turning from US 6/CO 9 (Blue River Parkway) from the I-70 on-ramps at exit 205 (Silverthorne).
  • Pedestrian facilities will detour around active work areas but will remain open.
  • The overlook east of the exit 203 (Frisco) on-ramp will be closed during construction.

Project Facts

  • Cost: $27 Million
  • Contractor:  Ames Construction
  • Timeline: March 2022 - late-October 2023
  • Location: I-70 between Frisco and Silverthorne

I-70 Auxiliary Lanes project map