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:

Throughout the spring there will be ongoing work along eastbound I-70 near mile point 240 to build the retaining walls at Water Wheel Park. Crews will also be pouring the plaza concrete, installing pedestrian railing and putting in the irrigation system and landscaping. This work will require single or double lane closures along eastbound I-70 as well as daytime closures of the Exit 240 (State Highway 103) on-ramp to eastbound I-70.

This work is expected to be done in early June and Water Wheel Park will then reopen to pedestrians.

On the east end of Idaho Springs work continues on the sidewalks and concrete islands along Colorado Boulevard at the Exit 241 interchange. Flaggers are on site during daytime hours to direct traffic in each direction through the roundabout and during the overnight hours two-way travel is maintained. Work on this bridge is scheduled to be substantially complete by June.

This spring there will also be work done on the bridge expansion joints at each of the seven bridges along the project corridor as weather conditions allow. This work entails removing sections of the asphalt pavement to take out the expansion joints and install new ones. This work will involve various single and double lane closures along eastbound I-70.

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How will the I-70 Mountain Express Lane Work?

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Fall 2015: Express Lane Closed

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Fall 2015: Express Lane Open

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

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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