CO 66 to CO 402

Project Highlights
Segment 6 Map
  1. Improve I-25 Mainline:
    • Two general-purpose lanes and one tolled express lane in each direction
    • Accommodations for three general-purpose lanes and one tolled Express Lane in each direction in the future for the ultimate condition
    • Modern design to meet current standards
    • 20 new bridges
    • Incorporation of Intelligent Transportation Systems (ITS)
    • Rural template with 32-foot center median
    • Priority section is approximately ½ mile south of the CO 56 interchange north up to the CO 402 interchange

  2. Improve Colorado Highway 60 Interchange

  3. Improve Larimer County Road (LCR) 16 Interchange

  4. Improve CO 56 Interchange
    • Straighten mainline I-25
    • Address substandard acceleration lanes
    • Construct Park-n-Ride location for an express rapid bus platform for Bustang
    • Improve Weld County Road (WCR 34) interchange

  5. Improve Frontage Roads:
    • Relocate frontage road intersections at WCR 32, WCR 34, WCR 38, CO 56/WCR 44, CO 60, and LCR 16
  1. Provide a safe facility for the public, as well as a safe work zone for construction and the traveling public.

  2. Provide full geometric standard with a rural median.

  3. Maximize the scope of work with the available fiscal resources.

  4. Ensure the longevity of the project, and compatibility with the ultimate configuration and emerging technologies.

  5. Improve mobility and traffic operations, and increase multimodal connections.
  1. Safer corridor

  2. Replaces aging and functionally obsolete infrastructure

  3. Provides drivers choice of a new reliable travel lane

  4. Reduces travel time

  5. Increases public transit options

  6. Increases public transit options

  7. Contributes to a continuous managed lane system from Denver to Fort Collins

Estimated costs to build near-term improvements on this segment (6) of the North I-25 Express Lanes project range from $200 million to $300 million, with work eligible to cost $650 million for both segments 5 and 6.

This cost estimate is for building two general-purpose lanes and one tolled Express Lane in each direction. Actual project costs are subject to market conditions, such as the value of property acquisitions, material costs and labor costs at the time the project goes to construction.

The Final Environmental Impact Statement for this project was completed.

CDOT processed Records of Decision for these segments in ROD 1 and Rod 4 for the two general-purpose lanes, and one tolled Express Lane configuration.

March 2018 
The team completed the project delivery selection matrix with a preferred delivery method of construction manager/general contractor (CMGC).

May 2018  
CDOT will issue a Letter of Interest (LOI).

July 2018  
CDOT will issue Requests for Proposals.

Spring 2019  
Construction is scheduled to begin