Project Overview

Please Note: Tolling has begun on US 36! Whether you plan on driving solo or as an HOV on the US 36 or I-25 Express Lanes, it's important to get a pass so that you can use these lanes. Create an ExpressToll account here, and order your pass today!

I-25 North Express Lanes Flatirons Completed Paving
Completed paving on northbound I-25


In October 2013, the Colorado Department of Transportation (CDOT) began a safety and mobility project on a 6-mile segment of I-25 between US 36 and 120th Avenue. The project will maximize the use of the existing highway infrastructure to expand the capacity of I-25 by adding one HOV/tolled Express Lane in each direction.  In addition, the project will resurface the existing lanes along this 6-mile stretch.

The new Express Lanes will connect directly with the existing I-25 Express Lanes leading into and out of downtown Denver, providing motorists with the option of carpooling or paying a toll for a faster, more reliable commute, or utilizing the existing general purpose lanes for free.

Flatiron Constructors Inc. is the contractor for this project, which is scheduled for completion in Spring 2016.


As of early January, the project is approximately 90 percent complete.

As of Jan 18, 2016, all mainline paving is complete. Current and upcoming work is focusing on the HOV connectors, overhead sign installation, final striping, and sound wall construction.

Crews expect the express lanes to be intermittently open to the public by mid-February 2016, with paid tolling anticipated in late spring 2016. From February to April, motorists will be able to access the Express Lanes free-of-charge while CDOT tests the tolling software and equipment.

Although it was originally scheduled for completion in October 2015, the project has been extended so additional sound walls can be put in place.

Soundwall Update
Northbound sound walls have been reinstalled along I-25 between US 36 and 84th Ave.

Crews will be installing portions of the sound wall panels along southbound I-25 from 104th Ave. to Thornton Parkway throughout the month of January.

Demolition of the northbound sound wall adjacent to the bike path between 104th Ave. and 120th Ave. path began January 18 and reconstruction is expected to be completed by the first of March.

Construction of a new southbound sound wall between 120th Ave. and 104th Ave. will begin in early February with completion expected in spring 2016.

Please note, all work is weather dependent and schedules are subject to change.

Working Hours and Impacts

Normal working hours are Monday through Friday from 5:30 a.m. to 4:30 p.m., and no lanes will be closed during the day.

Night work, requiring double lane closures, will take place from 10:30 p.m. to 5:30 a.m. Some night work on Fridays as well as weekend work will take place as needed.

Some night work on Fridays as well as weekend work will take place as needed. 

Please note: Motorists should not cross into closed lanes on I-25 for their own safety and the safety of the construction team. Lanes are closed at night to accommodate for large, heavy construction equipment and setting time for asphalt, concrete and striping. 

Stay Informed

If you have questions about the project, please leave a message on the project hotline or email us.  You will receive a response within 24 hours on business days. Sign up to receive alerts and updates by clicking on the project updates icon on the right side of this page.
Phone: 303-539-6966
Email:[email protected]

Smart Commute Corner

Smart Commute Metro North, the official travel options partner for the I-25 North Express Lanes Project, is here to help YOU find relief during the two-year construction project. Smart Commute has created some great options to relieve the stress of driving on I-25 during rush hours.

  • Get a free RTD 10-ride ticketbook to ride an express bus into downtown Denver
  • “Drive for Free or Ride and Relax” in a Smart Commute vanpool for a flat rate of $100 a month

If you have to stay in your car, be sure to download CDOT Mobile to your smart phone to find out about current travel conditions on north I-25 and get further information about Smart Commute’s incentives.

To sign up for the incentives above, visit Smart Commute online at or contact Paul DesRocher, TDM Manager, at [email protected] or 720-515-8674.


Project Information Line:
E-mail: [email protected]

Andy Stratton, P.E.
CDOT Region 1
Project Manager
[email protected]

Emily Wilfong
CDOT Communications Manager
303 512-5955
[email protected]

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