Eastbound I-70 Peak Period Shoulder Lane


The project, part of CDOT’s comprehensive plan to improve travel in the I-70 Mountain Corridor, will upgrade 13-miles of Eastbound I-70 within CDOT’s existing right of way. The upgrades will create the I-70 Mountain Express Lane; a wide shoulder that – only during peak travel periods – will operate as a third travel lane. The I-70 Mountain Express Lane will be dynamically priced to keep traffic moving. Prices will lower when CDOT wants to encourage drivers to use the lane and rise as the lane reaches capacity. Click here for more information on how express lanes operate.

Utilizing the shoulder to create an express lane within the existing I-70 right-of-way during peak periods instead of adding a full lane has several benefits:

Project Benefits

  • Dynamic toll pricing keeps traffic moving: prices lower to encourage drivers to use the lane and rise as the lane reaches capacity
  • Reduces travel time by nearly half from the Eisenhower/Johnson Memorial Tunnels to the top of Floyd Hill, resulting in an average 30-minute time savings
  • Provides drivers with the choice of a new more reliable travel lane
  • Avoids overbuilding I-70, by using the shoulder as a third lane, during peak hours
  • Enhances recent Twin Tunnels (Veterans Memorial Tunnels) improvements
  • Allows for faster speeds in all lanes, thus decreasing overall travel time

Click here to view the weekly lane closure report.

Current construction activity:

There continue to be single lane closures in various locations along the corridor in both the eastbound and westbound directions. Lane closures typically occur between the hours of 6 a.m. and 6 p.m. Mondays through Thursdays and 6 a.m. and noon on Fridays.

The westbound I-70 off-ramp to SH-103 (Exit 240) will not need to close for reconstruction, maintaining access to the downtown Idaho Springs Business and Historic District. Instead, the new off-ramp is being built adjacent to the existing ramp.

The Dumont on-ramp to eastbound I-70 (interchange 235) is scheduled to reopen in mid-June. Until that time, drivers will need to enter eastbound I-70 at Downieville (mile maker 234) or use Stanley Road to travel east into Idaho Springs.

In July, crews are scheduled to start asphalt milling operations at night across the entire length of the eastbound I-70 corridor. This work will require single lane closures during the overnight hours between mile markers 230 and 243.

Swipe table to see more content

How will the I-70 Mountain Express Lane Work?

Picture 4

picture 2 picture 3


Fall 2015: Express Lane Closed

Fall 2015: Express Lane Open

Swipe table to see more content

Stay Informed?



Click here to view the weekly lane closure report


Bilingual Project hotline: 303-223-6581


Have a question? Click here to contact the project team

Swipe table to see more content
Project Contact

For more information, please contact:

Neil Ogden
CDOT Project Manager

Emily Wilfong
CDOT Communications Manager
303 757-9484

Planning a Trip?

Slower speeds in construction zones may temporarily delay travel times.  We want to make sure you have access to events, trails and towns that make Colorado great. Use the resources below to help you prepare:

  • Sign up for free email and text alerts with CDOT’s GovDelivery service
  • Call the project hotline (303-223-6581) to listen to the most recent lane closure report
  • Visit
Colorado: The Official State Web Portal