Underpass Work on Arapahoe Rd at Lone Tree Creek Trail

Published on April 06, 2026

The City of Centennial, in collaboration with the Colorado Department of Transportation, will begin constructing a trail underpass along the Lone Tree Creek Trail corridor at E. Arapahoe Road starting mid-April. Work will take place on S. Arapahoe Road between S. Revere Parkway and S. Potomac Street (Mile Point 19.6) in the City of Centennial.

The project will include the construction of a concrete box culvert beneath E. Arapahoe Road which will connect the Lone Tree Creek Trail on the north and south side of the heavily traveled highway. Additional operations will include concrete sidewalk and curb upgrades, improvements to existing drainage infrastructure and minor patching and striping on E. Arapahoe Road.

The construction of the underpass and associated upgrades will be broken into three phases.

• Phase I is expected to take place from April to July 2026. Construction will be concentrated on the north side of E. Arapahoe Road with traffic shifted south.
• Phase II is anticipated between August and September 2026. Work will occur in the center of E. Arapahoe Road and traffic will be shifted into outside lanes.
• Phase III is expected between October 2026 and early Spring 2027. Construction will move to the south side of E. Arapahoe Road with traffic shifted.

The $4.3 million project is anticipated to create better trail connectivity and improve safety for cyclists and pedestrians. Investing in pedestrian infrastructure will help to reduce vehicle miles traveled, easing congestion and enhancing the environmental and economic vitality of the area. Construction is anticipated to be complete in the early Spring 2027.

Traffic Impacts

• General working hours will take place from 7 a.m. to 5 p.m., Monday through Friday.
• Three lanes of traffic will remain open in both directions of E. Arapahoe Road during peak travel hours. Motorists can expect single-lane closures during the following off-peak hours.
  • Eastbound E. Arapahoe Road: 9 a.m. to 3 p.m., Monday through Friday.
  • Westbound E. Arapahoe Road: 10 a.m. to 3 p.m., Monday through Friday.

• While nighttime operations will be limited during the project, motorists can expect single and double-lane closures in each direction on E. Arapahoe Road from 6 p.m. to 5 p.m., Sunday night through Friday morning.
• Intermittent weekend work is expected.
• Lanes will be narrowed to a 10-foot width.
• For the duration of the project, all left-turn movements at the intersection of E. Arapahoe Road and S. Revere Parkway will be restricted and motorists cannot proceed straight on S. Revere Parkway across E. Arapahoe Road. Only right-turn movements will be maintained during construction at this intersection. Motorists are encouraged to use S. Peoria Street or S. Potomac Street as alternate travel routes.
• Sidewalk closures along both sides of E. Arapahoe Road will occur at different times depending on the construction phase with signed detour routes in place.
• Bus routes in the area may be impacted during construction. Please check the RTD website for updated schedules or bus stop changes.
• Visit COTrip.org for real-time lane closure updates and road conditions on this project and others throughout the state.

Map of the project work zone on E. Arapahoe Road between S. Revere Parkway and S. Potomac Street.

Project Contact

To connect with the project team, please reach out to the contacts listed below. To subscribe to project specific emails, visit the website at centennialco.gov/ltctatarapahoe.

Phone: 720.656.5724

Email: lonetreetrailunderpass@gmail.com