CO 121 Signal Improvements in Jefferson County

About the Project:

Work includes replacing the antiquated existing traffic signals and with new traffic signal equipment.  This includes poles, mast arms, vehicle detectors, closed circuit television cameras, advanced flashing beacons, signing and minor striping at each intersection. Additional work includes removing and installing curb that is accessible for people with disabilities - Americans with Disabilities Act (ADA) ramps.

Project Benefits

  • Traffic signals are a vital part of controlling traffic in a safe and efficient manner by providing regulated movement. Vehicle detection will reduce unnecessary delays and stops at the intersection while improving travel times and increasing the amount of traffic that an intersection can handle.
  • Other benefits of the project include the installation of ADA compliant curb ramps. The new ramps will be constructed in compliance with the Public Right of Way Accessibility Guidelines (PROWAG) requirements and will provide function accessibility to all travelers using our state and US highways.

Work Schedule:

  • Hours of operation are Monday through Friday 7 a.m. to 7 p.m.

Traffic Impacts:

  • Motorists should plan for shoulder closures and single lane closures.
  • Refer to for real-time travel conditions and road closures

Work this Week & Lane Closures
CO 121 Signal Improvements

Project Facts

  • Construction Cost: $3.9 Million
  • Contractor: Sturgeon Electric of Denver
  • Timeline: June through December 2023
  • Location: CO 121 (Wadsworth Pkwy.
    • 90th Avenue
    • 94th Avenue
    • Independence Drive
    • 100th Avenue and 101st Avenue
    • Nearest Town/City: Arvada, Westminster
    • Mile Point(s): 21.80 to 23.50
    • County: Jefferson
CO 121 Wadsworth project area map
CO 121 Wadsworth project area map