Roadway Projects

Image of Centennial Public Works In-Action

1. 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.

2. Arapahoe Road Bridge Replacement

Project: Arapahoe Road Bridge Replacement over Big Dry Creek
Entity: City-led
Estimated End: Completed!

Learn more about this project on the Arapahoe Road Bridge page.

3. Arapahoe Rd. and Clarkson St. Traffic Signal

Project DescriptionThis project was selected to receive funding as part of the Safer Main Streets Initiative for the design of the new traffic signal and multimodal improvements at Arapahoe Rd. and Clarkson St. The City has been working with designers to have the overhead distribution lines raised in order to accommodate the signal. Construction to raise the lines has been completed. Installation of the transformer to power the signal is the next phase. Advertisement of construction is anticipated for Summer 2024.

Learn more about this project on the Arapahoe & Clarkson Traffic Signal page.

4. Arapahoe Road Improvement Project

Project Description: Arapahoe County has identified operational and safety improvements for Arapahoe Road between S. Lewiston Way and S. Buckley Rd. Operational and safety concerns identified include traffic congestion that blocks the eastbound to northbound left-turn lane movement to Olathe St. As well as eastbound Arapahoe Rd. to northbound Buckley Rd. left-turners, causing additional congestion. 

Arapahoe Road Improvement Recommendations Include: 1) Extending the turn lanes for eastbound Arapahoe Rd. to northbound S. Buckley Rd. 2) Closing the median break at Olathe St. 3) Extending the turn lanes for westbound Arapahoe Rd. to southbound S. Lewiston Way. 

For more information and updates please visit the Arapahoe County website.

5. Arapahoe Road Side-Paths

Project Description: As the City’s only major east/west road and a main arterial in the southern region, sidewalk connectivity along Arapahoe Rd. between I-25 and Parker Rd. has been a focus. Side-paths are larger sidewalks, typically double the size, which allows for more accessibility, modes of transportation and additional room for people to come and go. Construction of these side-paths to fill in gaps between existing sidewalks along with other improvements include ADA curb ramps and bus stop enhancements. Construction is anticipated to begin in 2025.

6. Colorado Blvd. Multimodal Improvements

Project Description: Multimodal improvements are planned along Colorado Blvd., from Arapahoe Rd. to Dry Creek Rd., to enhance safety, create more direct routes for pedestrians and cyclists, and improve connectivity to the neighborhoods and schools in the area. Planning is underway, and construction is estimated to begin in 2026.

Learn more about the study phase of this project on the Colorado Boulevard Multimodal Study page.

7. County Line Road Widening

Estimated Start Date: Construction estimated to begin Q3 2024

Project Manager: Jeff Dankenbring

Budget: Estimated Construction Cost over $25M, DRCOG TIP grant $12.4M, Centennial contribution $3M

Project Description: Douglas County is leading the County Line Road Widening and Reconstruction (University to Boulevard) project. It will include 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.

For more information, visit Douglas County’s County Line Road Widening Project page.

8. Easter Ave. and Joliet St. Traffic Signal

Project DescriptionThis project will construct a new traffic signal at this intersection of Easter Ave. and Joliet St./Kenton St. Design started in March of 2022 and has been completed. Construction is estimated to begin in 2024.

9. Havana St. and Easter Ave. Improvements

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 anticipated to begin in early 2026.

10. Holly St. and Easter Ave. Crosswalk

Estimated Completion: Fall 2024

Project Description: As part of CDOT’s Safer Main Streets Initiative, the City is installing a Pedestrian Hybrid Beacon System (PHB) to make it easier and safer for pedestrians to cross Holly St. and access the Willow Spring Open Space. The project will also include sidewalk improvements and trail connections on Holly St. just south of Easter Ave., along with a raised median and curb ramps to increase pedestrian safety and visibility to motorists traveling on Holly St.

Phase I (late July through September): Consists of underground and concrete work, including the construction of Americans with Disabilities Act (ADA) curb ramps, sidewalks and a concrete median. Motorists can anticipate single lane closures in both directions on Holly St. between Arapahoe and Dry Creek from 8:30 a.m. to 3:30 p.m., Monday through Friday. One lane will remain open to vehicular traffic in each direction. Pedestrians can expect closures of the sidewalks on the east and west sides of Holly St. as crews work to replace sections of the sidewalks. Pedestrians must follow posted detour signage during this work.

Phase II (October): Includes the installation of signal poles, roadway striping and other finishing work. Similar single lane closures can be expected by motorists, with one lane remaining open in each direction, during construction hours.

Crosswalk and traffic signal example for Holly St. and Easter Ave. roadwork

Photo: A bicyclist safely crosses Holly St. north of Arapahoe Rd. at a PHB crossing, similar to what is being constructed at the Willow Spring Open Space area.

11. I-25 at Dry Creek Rd. Corridor Improvements

Estimated Completion: Q1 2025

Project Description: This project, led by Arapahoe County will extend the eastbound Dry Creek Road right lanes, creating a through lane from the northbound I-25 off-ramp at Inverness Drive East. Other improvements to make travel through the area safer and help traffic flow are also planned. Intermittent lane closures should be expected during construction. 

Additional information is available at

I-25 and Dry Creek Road Corridor Ariel Map


12. Orchard Road Widening

Project: Orchard Road Widening

Entity: City-led

Estimated End: Complete

Project Description: This project widened the south side of Orchard Rd. from Ogden Ct. east to the Highline Canal, in addition to adding curbs, gutters, sidewalks and an underground storm line. Xcel undergrounded power limits, and other telecommunications relocated infrastructure during construction. Further, an additional turn lane on Orchard Rd. was installed, helping traffic flow and safer streets. 

Before and after of Orchard Road Widening project


13. S. Alton Way Sidewalks and Street Lighting

Estimated Completion: Fall 2024

Project Description: The City is working alongside the Southgate at Centennial Metropolitan District and Southeast Public Improvement Metro District (SPIMD) to construct a new attached sidewalk to complete a pedestrian connection through S. Alton Way. This project will install new street lighting as well with options of innovative smart lighting systems.

Below is a conceptual design map. Please note that the blue line is the proposed sidewalk and yellow is the extent of the new lighting installation. There is also a proposed crosswalk where S. Alton Ct. connects with S. Alton Way.

map showing new sidewalk along S Alton Way

14. Street Rehabilitation Program

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