Major traffic impacts coming during weekend-long single, double lane closures on SB I-25 between 120th and 112th Avenues

August 21, 2019 - Metro Denver Area, Colorado

NORTHGLENN/WESTMINSTER, CO — This weekend, motorists can anticipate significant delays while the Colorado Department of Transportation and contractor partner, Graham Contracting, Inc., perform safety critical paving on the North Interstate 25 Express Lanes: 120th Avenue to Northwest Parkway/E-470 project. Specifically, motorists can anticipate overnight double lane closures, daytime single lane closures and the full closure of the 120th Avenue on-ramp to southbound I-25. Crews will work to correct a vertical height difference between existing pavement and new pavement on a mile-long stretch of southbound I-25 (120th Ave. to approximately 112th Ave/Community Center Dr.), requiring various closures for the safety of both motorists and workers.

Traffic impacts include:

What: Double lane closures on southbound I-25 from 120th Ave. to 112th Ave./Community Center Dr.

When: 8 p.m. Friday, Aug. 23, to 9 a.m. Saturday, Aug. 24

           7 p.m. Saturday, Aug. 24, to 9 a.m. Sunday, Aug. 25

           7 p.m. Sunday, Aug. 25, to 5:30 a.m. Monday, Aug. 26

Detour: Motorists may continue on southbound I-25 using a single lane or detour using Huron St. to the west of the highway or Washington St. to the east.

What: Single lane closures on southbound I-25 from 120th Ave. to 112th Ave./Community Center Dr.

When: 9 a.m. to 7 p.m. Saturday, Aug. 24

           9 a.m. to 7 p.m. Sunday, Aug. 25

Detour: Motorists may continue on southbound I-25 using two lanes or detour using Huron St. to the west of the highway or Washington St. to the east.

What: Full closure of the 120th Ave. on-ramp to southbound I-25

When: 8 p.m. Friday, Aug. 23 to 5:30 a.m. Monday, Aug. 26

Detour: Motorists can use Huron St. to the west of the highway or Washington St. to the east to access the 104th Ave. on-ramp to southbound I-25.

Motorists can expect heavy traffic and additional travel time, and are urged to use an alternate route during these lane closures. All work is weather dependent and subject to change.


  • Add capacity with one Express Lane in each direction.
  • Provide travelers with the choice of taking the general-purpose lanes for free or driving the Express Lanes for a faster trip in exchange for a variable toll - the Express Lanes will be free to vehicles with three or more people.
  • Build an auxiliary lane along northbound I-25 connecting the 136th Avenue on-ramp to the 144th Avenue off-ramp, helping drivers merge more comfortably between the two interchanges.
  • Resurface the roadway which will improve driving conditions.
  • Address necessary drainage and utility improvements along the corridor.


For additional information about this project, call the project information line at (303) 339-0225, email the team at [email protected], or visit the I-25 North Express Lanes project website and sign up for updates.

Major traffic impacts for this project are anticipated to conclude at the end of 2019 with the new Express Lanes estimated to be fully open by spring 2020.

For information on travel conditions visit, sign up for GovDelivery, or call 511. Updates are also available via Twitter @coloradodot and CDOT’s Facebook page at


The following tips are to help you stay safe while traveling through maintenance and construction work zones.

  • Do not speed in work zones. Obey the posted speed limits.
  • Stay Alert! Expect the unexpected.
  • Watch for workers. Drive with caution.
  • Don't change lanes unnecessarily.
  • Avoid using mobile devices such as phones while driving in work zones.
  • Turn on headlights so that workers and other drivers can see you.
  • Be especially alert at night while driving in work zones.
  • Expect delays, especially during peak travel times.
  • Allow ample space between you and the car in front of you.
  • Anticipate lane shifts and merge when directed to do so.
  • Be patient!



To heighten safety awareness, the Colorado Department of Transportation recently announced its Whole System — Whole Safety initiative. This project takes a systematic statewide approach to safety combining the benefits of CDOT’s programs that address driving behaviors, our built environment and the organization's operations. The goal is to improve the safety of Colorado’s transportation network by reducing the rate and severity of crashes and improving the safety of all transportation modes. The program has one simple mission—to get everyone home safely.



CDOT has approximately 3,000 employees located throughout Colorado, and manages more than 23,000 lane miles of highway and 3,429 bridges. CDOT also manages grant partnerships with a range of other agencies, including metropolitan planning organizations, local governments and airports. It also administers Bustang, the state-owned and operated interregional express service. Governor Polis has charged CDOT to further build on the state’s intermodal mobility options.