Overview
The City of Centennial commits to strategic and budgetary planning for the construction of new improvements and preservation of the City’s infrastructure.
Improvements may include street rehabilitation, road widening, new traffic signals, new recreational trails, parks and other pieces of infrastructure.
View Roadway Projects
There are two ways to view details on roadway projects taking place in Centennial. You can select projects linked in the Table of Contents above, or click the next and previous buttons below.
Timeline: Completed September 2025.
Project Description: The new traffic signal at Arapahoe Rd. and Clarkson St. is now live! Improvements include new pedestrian signals, pavement marking modifications, lighting and striped crosswalks.
Learn more about this project on the Arapahoe & Clarkson Traffic Signal page.
Timeline: Construction is underway and anticipated completion is early 2026.
Project Description: Arapahoe County is making operational and safety improvements on Arapahoe Rd. between S. Lewiston Way and S. Buckley Rd., helping address traffic congestion at the intersection of Olathe St.
Construction will extend the turn lanes for eastbound Arapahoe Rd. to northbound S. Buckley Rd., close the median break at Olathe St., and extend the turn lanes for westbound Arapahoe Rd. to southbound Lewiston Way.
For more information and updates, please visit the Arapahoe County website.
Project Description: As the City’s major east/west corridors, Arapahoe Rd. serves as a main connection in the southern region. Improving sidewalk connectivity along Arapahoe Rd. between I-25 and Parker Rd. has been a focus.
Sidepaths are wider sidewalks typically twice the size of standard ones that allow for greater accessibility and additional room for people walking, biking, skating and more.
Where: Construction of these sidepaths will fill in gaps between S. Peoria St. and Jordan Rd. along with ADA curb ramp improvements. The project will also replace the timber fence along the Algonquin Acres neighborhood with a brown/beige colored concrete fence.
When: Construction is anticipated to begin Q2 2026.
The project team hosted an open house with the Algonquin Acres neighborhood on October 29 to discuss the project in further detail and gather feedback.
Residents shared valuable feedback about the length and placement of the new fence which the project team is taking into consideration as the final design is completed. The neighborhood voted overwhelming in favor of the Ashlar Stone C formliner finish for both sides of the wall.
The project team will continue coordinating with businesses and property management companies along the corridor as improvements move forward.
Project Description: In June 2021, the City of Centennial adopted the Colorado Boulevard Multimodal Corridor Study(PDF, 69MB) to improve safety and accessibility for all types of transportation along Colorado Boulevard between Orchard Road and County Line Road.
As the first major implementation of the 2021 Corridor Study’s recommendations, the City was awarded 90% of the funding to construct the 1-mile stretch between Arapahoe Road and Dry Creek Road. The project is currently in the design phase to reduce this portion of Colorado Blvd. to one lane in each direction with a center turn lane, with the remaining roadway space being repurposed for multi-use paths.
The City also conducted the Colorado Blvd. and Euclid Ave. Study which evaluates ways to improve traffic safety and operations for pedestrians, bicyclists, and motorists and the intersection of Colorado Blvd. and Euclid Ave.
Learn more about the studies, project updates and more on the Colorado Boulevard Multimodal Study page.
Project Timeline: Completed November 2025.
Project Description: The City replaced the cedar fence on the north side of County Line Road, between Willow Creek Trail and Willow Creek Shopping Center, with a more durable composite TREX fence. The new composite fencing requires less maintenance and has a longer life span.
Project Timeline: Construction began September 2025 and is estimated to take 24 months.
Project Description: Douglas County is leading the County Line Road Widening and Reconstruction (University to Broadway) project. It includes a new traffic signal at the Clarkson Street / County Line Road intersection, a mill and overlay for the portion of the road within the City of Littleton located between Phillips Avenue and Broadway, as well as adding sidewalks.
Construction requires a full closure for approximately 100 days on a small segment of the road, between Clarkson St. and the U-Haul business access. The closure began in early January 2026 with an anticipated reopening April 2026.
The closure allows Douglas County crews to safely move and place a significant amount of dirt at Lee Gulch, eliminating the dip in the roadway and improving drainage, visibility and overall safety. Business access will remain open, and Dry Creek Rd. and C-470 can be taken as alternate routes.
For more information, visit Douglas County’s County Line Road Widening Project page. For current traffic impacts, visit Douglas County’s Cone Zone.
Project Description: The City plans to make operational improvements at the intersection of Havana St. and Easter Ave. Updates include traffic flow enhancements, along with pedestrian and bicycle improvements. Overall, it will strengthen Easter Ave. (and Broncos Pkwy.) as an alternative to Arapahoe Rd. for east-west traffic. Planning is currently underway, and construction is to begin in early 2027.
Timeline: Completed July 2025.
Project Description: The project, led by Arapahoe County, extended the eastbound Dry Creek Rd. right lanes, creating a through lane from the northbound I-25 off-ramp at Inverness Drive East. Other enhancements included new roundabouts, bike lanes and multi-use paths, improved pedestrian crossings, and other infrastructure upgrades.
Additional information is available at arapahoeco.gov/drycreek.
Project Description: Centennial regularly conducts street rehabilitation throughout the City. Click below to view the Street Rehabilitation Program map and see current and upcoming projects.
Entity: City-led
View the Street Rehabilitation Projects Map