Be sure to keep an eye out for major construction projects that may affect your travel routes. Below is an overview of current major construction projects in the City of Centennial. 

I-25 and County Line Road Intersection Traffic Signal Replacement (CDOT)
2018 Street Rehabilitation Program 
Arapahoe Road (I-25- Buckley Road) Corridor Study - Open House Wednesday, May 23! Learn more
East Quincy Avenue Widening
Long Road Reconstruction (Greenwood Village)

I-25 and County Line Road Intersection Traffic Signal Replacement (CDOT)

Contact: Project Website |​ Email |​ Project Hotline: 1-844-253-3185
Start Date: January 16, 2018
Estimated End Date: late spring 2018

Project Background:

Work on this project consists of removing the existing, outdated traffic signals and equipment in the west ramp of the intersection and installing new ones. Other elements of the project include curb ramp replacement with ADA-compliant ramps (American with Disabilities Act), signing and striping. The project was suspended in late 2017 due to design changes and material lead times.

Normal working hours will be from 7 a.m. to 6 p.m., with lane closures from 9 a.m. to 2 p.m., Monday through Friday. In special cases these hours may be extended. Motorists should be prepared for right-lane closures and lane shifts during construction hours. Intermittent nighttime operations and temporary traffic stops are possible when crews remove and replace the mast arms.  View Project Highlights


2018 Street Rehabilitation Program

Contact: Michael Terry, CIP Street Rehabilitation Manager
Tentative Start Date : April 2, 2018
Estimated End Date: October 1, 2018
Estimated Cost: $6,750,000

Street Rehabilitation Map

Crack Seal Map

Concrete Replacement - Streets receiving mill and overlay will also receive concrete rehabilitation before the pavement treatment. This effort repairs broken curbs, gutters, sidewalks and other concrete structures that if left un-repaired will shorten life of the major rehabilitation investment. As part of this work, curb ramps will be repaired and brought to current Americans with Disabilities Act (ADA) standards and the removal of concrete bus pads on E. Arapahoe Road.

Crack Seal - Streets that are still in good condition have cracks that appear over time due to weather and traffic. This operation will seal the cracks with an asphalt rubber to stop the penetration of moisture and extend the life of the pavement.

Hot In-Place Recycling (Heater/Repave) - Street segments receiving this treatment will have the existing pavement heated, re-mixed and placed, and finally topped with new asphalt in one continuous process. This treatment is environmentally friendly because it reused existing materials and significantly less natural resources. S. Colorado Boulevard to E. Dry Creek Road​ to E. Arapahoe Road and E. Dry Creek Road from S. Clarkson Street to S. Pennsylvania Drive. 

Mill and Overlay - Streets receiving a mill and overlay treatment will have the surface of the road milled for a portion or the entire width of the street and a new asphalt surface constructed.

Surface Treatment (Slurry Seal) - Streets that have less severe cracking and display less distress can be preserved with a slurry seal. When used properly, this treatment will extend a street's pavement life five to seven years. 

Arapahoe Road Corridor Study

Contact: Travis Greiman, Public Works Director
Start Date: May 2018
Estimated End Date: December 2018
Estimated Cost: $500,000

The Arapahoe Road Corridor Opportunities Study is underway. This is a comprehensive roadway analysis of operations along the Arapahoe Road corridor from I-25 to Buckley Road. This analysis will look at the current flow of traffic along this stretch of roadway and identify short and long-term improvements at intersections along the corridor. The overall goal of this study is to identify and prioritize improvements to safety and  operations along the corridor while recognizing current and future development potential will continue to influence the character of the corridor.

East Quincy Avenue Widening

Contact: Kelsey Deckert, Engineer II, 303-754-3349
Start Date: Late-May 2018
Estimated End Date: November 2018
Estimated Cost: $1,900,000 (combined funding from Centennial & Aurora)

The intent of this project is to widen East Quincy Avenue between South Reservoir Road and South Himalaya Way from the current two-lane configuration to six-lanes for a consistent roadway through the corridor. Work will include installation of curb, gutter, and asphalt, signal and striping modifications, and installation of sidewalk and street lights.  The project is intended to reduce congestion, increase continuity and improve safety through the area for both vehicular and pedestrian traffic.  The project will be led by the City of Aurora with the involvement and support of the City of Centennial.

Normal working hours will be 7:30 a.m. to 4 p.m. Monday through Friday, but may be extended for special circumstances.  While Quincy Avenue will remain open to traffic during construction, alternate routes are advised.  The project will be phased and require closures of access to and from Quincy Avenue at adjacent roadways for periods as long as several months.  Detours will be in place during these times and provided here and signed in the impacted area. View detour map.

Surrounding Area Projects

Long Road Reconstruction | The City of Greenwood Village 

The City of Greenwood Village Public Works Department is reconstructing the pavement on East Long Road, East Long Lane, and Jackson Street. The project will consist of pavement reconstruction, upgrading of the drainage system and enhancement of the streetscape section. Identified goals include: the mitigation of winter icing conditions, traffic calming and improved pedestrian safety. 

Long Road is currently subject to one-way flagging from 8:30 a.m. to 3:30 p.m. Monday – Friday and open to two-way traffic outside of these hours. Weekend closures of Long Road will be required with detour routes in place.  Work will occur between 7 a.m. to 7 p.m. on weekends. Work is anticipated to be complete by the end of June, 2018.

For more information, please visit the project website at or call John Wannigman, Project Manager, at 303-708-6139 or email

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City of Centennial
13133 East Arapahoe Road
Centennial, CO  80112

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