CO 66 and Weld County Road 21 Intersection Improvements

There are three CDOT projects on CO 66 between Mead and Platteville this construction season. Project teams are coordinating schedules and traffic control. Drivers are encouraged to take alternate routes, use extra caution in the work zones, and follow all signs and markings.
More information on the other two projects is available below:

About the Project:

The Colorado Department of Transportation will make safety improvements at Colorado Highway 66 and County Road 21. This project will improve the intersection by adding left turn lanes to all intersection approaches, and the intersection will be resurfaced with asphalt pavement. Work includes reconstructing drainage and irrigation systems. CR 21 stop signs will be upgraded to flashing light displays for improved visibility.

Project Benefits

These improvements will benefit the public by:

  • Enhancing safety and mobility for travelers
  • Improving traffic flow and visibility
  • Providing a smoother driving surface
  • Increasing the longevity of the highway

Work Schedule:

  • Daytime work hours ranging from 7 a.m. to 5 p.m. Monday through Friday
  • Night and weekend work are possible
  • Phased construction from Winter 2024 - Summer 2024

Traffic Impacts:

Motorists can expect the following impacts during the period of construction:

  • Travelers should expect intermittent lane closures, traffic shifts and alternating traffic
  • Flaggers may be present, be prepared to stop
  • Detour routes will be signed if temporary road closures are necessary
  • Traffic will be held at intersections and driveways while equipment passes through to ensure product quality and safe operations
  • Temporary rough riding surfaces may be present until paving is finished
  • Speed limit reductions and width restrictions will be in place as needed
  • Watch for vehicles entering and exiting the work zone
  • Refer to for real-time travel conditions and road closures

Work this Week & Lane Closures
CO 66 and CR 21 Intersection

Project Facts

  • Construction Cost: $2.94 Million
  • Contractor: Martin Marietta Materials
  • Timeline: Winter 2024 – Summer 2024
  • Location: CO 66 and Weld County Road 21 
    • Nearest Town/City: between Mead and Platteville
    • Mile Point(s): MP 48.50 to 49.50
    • County: Weld