Project Overview


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 51 percent complete. As of the end of November, both the northbound and southbound shoulders on I-25 have been completely paved throughout the project.

Traffic has been shifted to the newly reconstructed shoulders and construction has moved into Phase 3, with the team working on the inner lanes of I-25.

Currently, crews are performing demo and retrofitting operations in the median of I-25 between Thornton Parkway and 84th Avenue. Paving operations also are taking place in the new HOV lanes and will continue through the new year.

Sound wall posts have been poured for two sound walls north of Thornton Parkway. Walls along northbound I-25 near 120th Avenue, near 76th Avenue and south of 84th Avenue have been completed. Additional sound wall work will take place in late January 2015.

Working Hours and Impacts

Normal working hours are Monday through Friday from 7 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 9:30 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 Transportation Demand Management (TDM) partner for the I-25 North Express Lanes Project, will release an update to the CDOT Mobile smartphone app to include information on commuting options and incentives to commuters traveling through the construction zone. Existing CDOT Mobile users who wish to explore the new app functionality can simply choose the “Commute Smarter NOW” button found on the app’s header. For those currently without the app, it can be downloaded through either Apple iTunes or Google Play online stores.

For additional information about commuting options and incentives, including a free RTD 10-ride ticketbook for the 120x and 122x, visit Smart Commute Metro North’s webpage 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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