I-25 in Central Denver to be resurfaced and improved

Travel Advisory

April 4, 2025 - Denver Metro - Project begins in early April, motorists should prepare for nightly lane closures

Denver — The Colorado Department of Transportation will begin a project to improve and resurface a heavily-traveled five-mile stretch of Interstate 25 from Alameda to 44th avenues in April. Work will include new pavement, repaired expansion joints between the roadway and bridges, new signs and restriping. The project will also replace 2,700 linear feet of old concrete barrier segments with new segments along sections of I-25 next to the South Platte River between the US 6 on-ramp to southbound I-25 to the end of the southbound I-25 off-ramp to Alameda Avenue. The new segments along this location will be stronger and taller structures. The project is expected to be completed in late January 2026. Asphalt Specialties CO., Inc., of Denver, is the contractor.

The resurfacing will prolong the life of the road, provide a smoother surface and add durability. This will improve safety and reduce the need for emergency and pothole repairs. New pavement markings and signs will increase lane and interchange visibility.

Travel Impacts

  • April 6 through late April to early May, 9 p.m. to 6 a.m., Sundays to Thursdays: crews will replace barriers along southbound I-25 between the US 6 ramp to Alameda Avenue. This will require overnight closures of the east and westbound US 6 on-ramps to southbound I-25 and the southbound I-25 off-ramp to Alameda Avenue. There will also be single lane and shoulder closures on southbound I-25 in this area. Detours for the ramp closures will be in place. Refer to detour information below.
  • Resurfacing work will begin once nighttime temperatures are consistently warm enough for asphalt paving.
  • Mid-May through late October, 9 p.m. to 6 a.m., Sundays to Thursdays: a single lane closure at 9 p.m. and then up to three lanes closed in each direction a few hours later on I-25 between Alameda and 44th avenues. All lanes will re-open before 6 a.m.
  • While most of the lane and ramp closures will take place at night when traffic volumes are at their lowest, motorists should expect some delays. There could be weekend lane closures during the day and night as well. The project team will adjust closure times depending on major events in the area.
  • Motorists are urged to drive with extra caution through the work zone, watch for crews, heed the signs, do not speed and leave plenty of following distance.
  • Overhead electronic signs, other signage and traffic cones will be set up well in advance of the closures to warn motorists.
  • Motorists can sign up for project updates by going to codot.gov/projects/i25centralresurfacing, and get lane closure information and real-time traffic conditions on cotrip.org

Ramp Detours 9 p.m. to 6 a.m., Sundays to Thursdays in April

  • US 6 On-Ramps to Southbound I-25 Detour:
    • Motorists traveling on east or westbound US 6 will take southbound Kalamath Street to the Santa Fe/Kalamath on-ramp to southbound I-25.
  • Southbound I-25 Exit Off-Ramp to Alameda Avenue Detour:
    • Motorists traveling on southbound I-25 will take the Santa Fe Drive Exit, proceed on South Santa Fe Drive, then turn left to cross Mississippi Avenue over South Platte River and then turn left on North Santa Fe Drive to Alameda Avenue.
Map of I-25 Central Denver Resurfacing Project Location from Alameda to 44th avenues from April 2025 to January 2026
Project map showing where improvements will occur on I-25 from Alameda to 44th avenues in central Denver.

Project Information

Visit the project website at: codot.gov/projects/i25centralresurfacing

Know Before You Go

Travelers are urged to “know before you go.” Gather information about weather forecasts and anticipated travel impacts and current road conditions prior to hitting the road. CDOT resources include:

Download the COtrip App!

The new free COtrip Planner mobile app was designed to meet the growing trend of information on mobile and tablet devices for the traveling public. The COtrip Planner app provides statewide, real-time traffic information, and works on mobile devices that operate on the iOS and Android platforms. Visit the Google Play Store (Android devices) or the Apple Store (iOS devices) to download!