C-470 & Quincy Roundabouts

Traffic Impacts - Nov. 10 to Nov. 16

Travel Advisory

• The Colorado Department of Transportation plans to reopen the westbound C-470 off ramp at W. Quincy Ave. by Sunday, Nov. 10, weather permitting
• A backup reopening date is Monday, Nov. 11
• Once reopened, traffic at the new roundabout will be shifted to its permanent configuration
• This permanent configuration consists of two lanes in each direction - a single lane in the roundabout and a single bypass lane
• The westbound C-470 on and off ramps were closed during the final ramp reconstruction work and traffic switch
• The on ramp reopened on Nov. 6
• Speed limit and stop signs are present within the project limits for traffic management and to maintain safety
• A 12-foot width restriction is in place within the work zone
• Construction schedules are weather dependent and subject to change

Ongoing Traffic Impacts

• The Colorado Department of Transportation plans to reopen the westbound C-470 off ramp at W. Quincy Ave. by Sunday, Nov. 10, weather permitting
• A backup reopening date is Monday, Nov. 11
• Once reopened, traffic at the new roundabout will be in its permanent configuration
• This permanent configuration consists of two lanes in each direction - a single lane in the roundabout and a single bypass lane
• A 12-foot width restriction exists through the work zone
• Shoulder closures will be taken during certain work activities
• Working hours are 7 a.m. to 6 p.m. Monday to Friday, except on holidays
• Please exercise caution and obey posted speed limits and signs
• The project limits on W. Quincy Ave. extend from Mile Point 0 to MP .56
• Signs and construction devices are present to alert motorists to the new alignment, speed limit, and work zone restrictions
• Construction schedules are weather dependent and subject to change

• Three-way stop signs have been added to manage traffic flows
• Lanes are reduced and caution is advised
• A 12-foot width restriction exists through the work zone
• Shoulder closures will be taken during certain work activities
• Working hours are 7 a.m. to 6 p.m. Monday to Friday, except on holidays
• Please exercise caution and obey posted speed limits and signs
• The project limits at this location extend from Mile Point 0 to MP .225
• Signs and construction devices are present to alert motorists to traffic shifts, reduced lanes and work zone restrictions
• Construction schedules are weather dependent and subject to change

Work Zone Safety Alert

• Please drive slowly and exercise caution within the project limits as conditions are changeable and construction crews, pedestrians and cyclists may be present
• Eastbound traffic should take extra precautions due to early morning sun glare 
• Adjust your speed to avoid sudden reactions
• The roundabout will open in its permanent configuration by Monday, Nov. 11, weather permitting
• New stop signs and speed limit signs have been added within the work zone to manage traffic flows and maintain safety for the traveling public, the construction crews and the surrounding community
• New stop signs have been added at the site of the southbound ramp intersection during construction of a T-intersection with traffic signal
• Please obey speed limits and traffic signs and exercise caution
• Message boards, signs and construction devices are present to alert the public to the work zone, closures and restrictions

General Impacts, Schedule & Scope of Work

• The project began in mid-May with an anticipated duration of 18 months
• Work 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
• Other work includes adding capacity, building retaining walls, installing signs, and making drainage improvements
• Periodic on and off ramp closures to and from C-470 at Quincy Ave will be taken 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
• No work will take place on mainline C-470
• Normal working hours will be from 7 a.m. to 6 p.m. Monday to Friday
• Overnight work can be expected
• The project limits on C-470 extend from MP 6.10 to MP 6.80
• The project limits on Quincy extend from MP 0 to MP .56
• 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
• Please refer to COtrip.org for real-time travel conditions and to plan your trips!