Starting in mid-May, the Colorado Department of Transportation will begin a traffic flow and ramp improvement project at the Colorado Highway 470 and W. Quincy Avenue intersection in Jefferson County. Work on this state and federally funded project includes adding a single lane roundabout with bypass lanes at the Quincy and C-470 northbound ramp intersection, and a T-intersection with traffic signal at the Quincy and C-470 southbound ramp intersection. Project hours will be 7 a.m. to 5 p.m. Monday to Friday with some overnight and weekend work also expected. CDOT anticipates full completion by late 2025. Villalobos, Concrete, Inc. has been selected as the prime contractor for the project.

Traffic Impacts

• Motorists can expect the following impacts during construction:
  Periodic on and off ramp closures to and from C-470 at Quincy Ave during off-peak daytime as well as overnight hours
• Some closures of half the existing Quincy Ave over C-470 bridge will be taken for roundabout and other construction, with two-way traffic maintained and 12-ft width restriction in place
• A single lane closure on northbound C-470 will exist later in the project for sign work
• Onsite detour pavement will be built to route traffic around the proposed roundabout location
• Other detour routes will be marked for use during later phases of construction
• Signs and construction devices will be present to alert the public to the work zone, closures and restrictions
  Construction schedules are weather dependent and subject to change

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