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!

A new sound wall constructed on northbound I-25 near 120th Avenue.


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 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 October 2015.  

Photo: A new sound wall constructed on northbound I-25 near 120th Avenue.


To date, the project is approximately 73 percent complete.

Current and upcoming work is focusing on constructing northbound and southbound connectors for the HOV lanes. In the I-25 median, crews are working on barrier rail, performing electrical work, installing overhead sign caissons and hanging new overhead signs. Sound walls along the corridor also are continuing as scheduled. 

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. 

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

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 or 720-515-8674.


Project Information Line:

Andy Stratton, P.E.
CDOT Region 1
Project Manager

Emily Wilfong
CDOT Communications Manager
303 512-5955

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