2025 Monarch Boulevard & Castle Pines Parkway Road Construction
Project Overview
As a part of the 2025 Road Solutions projects, improvement efforts began on June 2, 2025, along Monarch Boulevard and Castle Pines Parkway. These projects represent a significant investment in Castle Pines’ infrastructure, enhancing safety, increasing mobility, and upgrading critical utilities. This project includes rehabilitation work from Buffalo Trail to Winter Berry Place and complete reconstruction from Berganot Trail to Buffalo Trail.
Schedule:
- Project Started: June 2, 2025
- Phase One Reconstruction (from Berganot Trail to Hidden Pointe Boulevard) Completed: August 12. 2025
- Phase Two Reconstruction (from Hidden Pointe Boulevard to Buffalo Trail) Started: August 12, 2025
- Phase Two Reconstruction Completed: October 16, 2025
- Phase Three (roundabout construction at Buffalo Trail and Monarch Boulevard): Begins October 16, 2025
- Northbound and southbound traffic will be open on Monarch Boulevard during the Phase Three roundabout construction
- Phase Three (roundabout construction at Buffalo Trail and Monarch Boulevard) Completion: mid-November 2025
Project improvements include:
- 2,400 feet of roadway improvements from Berganot Trail to Winter Berry Place
- Safety enhancements
- Stormwater infrastructure improvements
- Six-foot bike lanes
- 1,700 feet of new water line by the Castle Pines North Metropolitan District from Berganot Trail to Buffalo Trail
- Temporary traffic light installation at Monarch Boulevard and Buffalo Trail intersection
- During the June 24, 2025, the City Council approved the addition of a roundabout at the intersection of Buffalo Trail and Monarch Boulevard. This addition will be completed as part of the ongoing 2025 Monarch Boulevard reconstruction project.
- View an aerial drawing of the roundabout.
- Why a roundabout? A traffic study was conducted to examine both a signalized intersection and a roundabout. The intersection did not meet traffic signal warrants, but the analysis did justify a roundabout to improve the traffic flow and safety at the Buffalo Trail and Monarch Boulevard intersection.
Current Traffic Closures and Detours
Beginning October 16, 2025:
- Monarch Boulevard will be open to northbound and southbound traffic at Buffalo Trail.
- Access to Monarch Boulevard from Buffalo Trail will be closed (see the detour map below for more information.)
Detour Routes:
For information about the detour in Phase Three please view detour map below. Click on the map image to enlarge. Text describing the map image is also provided below.
Descriptions of Map Image:
Buffalo Trail Closure and Detour Map: The map shows that Buffalo Trail will be closed to traffic between Winter Ridge Drive and Monarch Boulevard for roadway construction. Access to homes within the construction area will be maintained via Castle Pines Parkway and Buffalo Trail.
If you have questions about the projects, please email monarch@castlepinesco.gov or call 303-705-0200.
Want to learn more about our long-term Road Solutions?
City Council has created a Plan of Action for the Streets of Castle Pines. Visit our Road Solutions page and find out how the City plans to invest heavily in our infrastructure over the next several years.