I-25 Central Denver Resurfacing

About the Project

The project will improve and resurface a heavily traveled five-mile stretch of Interstate 25 in central Denver from Alameda to 44th avenues. Improvements will include:

  • New pavement
    • Work involves rotomilling, which removes the old, weathered asphalt to be replaced with new asphalt.
    • This section of I-25 was last resurfaced in 2015.
  • Repaired expansion joints between the roadway and bridges
  • New signs
  • Restriping
  • New concrete barriers
    • The project will replace 2,700 linear feet of old concrete barrier segments with new segments along I-25 near the South Platte River between the US 6 entrance ramp to southbound I-25 to the end of the southbound I-25 exit ramp to Alameda Avenue.
    • The new barriers will be stronger and taller structures, 36 inches high and 24 inches thick at the base with steel reinforcement within the concrete. 

Lane and ramp closures will be mostly overnight. Work begins in early April to replace the barriers next to the South Platte River, which will require overnight ramp closures: US 6 on-ramps to southbound I-25 and the southbound I-25 off-ramp to Alameda Avenue.  These closures will last for about a month.  When the weather gets consistently warmer in May there will be up to three lanes closed overnight on I-25 in both directions. Adjustments will be made for events. More detailed information on traffic impacts is below. 

Motorists are urged to drive with extreme caution through the work zone. 

Work this Week & Lane Closures on I-25 Central Denver

Project Facts

  • Construction Cost: $22 Million
  • Contractor: Asphalt Specialties CO, Inc.
  • Timeline: April 2025 to January 2026
  • Location: I-25 
    • Nearest Town/City: Denver
    • Mile Point(s): MP 208 to MP 213.5
    • County: Denver
Project location map for I-25 resurfacing in central Denver, Colo.
Project location map for I-25 resurfacing in central Denver from Alameda to 44th avenues.

Project Benefits

The resurfacing will provide the following benefits:

  • Prolong the life of the road, provide a smoother surface and add durability
  • Improve safety and reduce the need for emergency and pothole repairs
  • New pavement markings and signs will increase lane and interchange visibility

Work Schedule

  • The ramp, barrier and resurfacing work will last approximately 10 months from early April to late October.
  • Lane and ramp closures will take place during the nights mostly when traffic impacts are lowest. 

Traffic Impacts

  • April 6 through late April to early May, 9 p.m. to 6 a.m., Sundays - 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. 
  • 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 - 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.
  • Lane closure information and real-time traffic condition are posted on cotrip.org.