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Roundabout coming to Lagae and Happy Canyon roads

map of roundabout

Map of the planned roundabout at the intersection of Lagae Road and Happy Canyon Road, west of I-25.


As part of the City of Castle Pines ambitious 2023 Road Solutions Initiative, residents can look forward to a significant upgrade in road safety and traffic flow at the intersection of Lagae and Happy Canyon roads.  This eagerly anticipated project will introduce a roundabout as an improvement to the I-25 and Happy Canyon Road interchange.  Currently, a single stop sign and T-junction are all that regulate vehicles at a location that has seen significant property development in the last two years.

The City Council of Castle Pines awarded a contract for design and engineering services to initiate the intersection improvements, and work is set to commence in 2023 with a target completion for summer 2024.  The project aims to address longstanding traffic issues and improve the overall transportation infrastructure in the region.

In a letter to Douglas County Commissioners requesting additional funding participation for the project, Mayor Tracy Engerman highlighted the need to begin construction on time so that the roundabout can be completed before the PGA’s BMW Championship in August 2024, hosted by the Castle Pines Golf Club.  The event is expected to bring a temporary, but heavy, increase in traffic to Castle Pines.

Roundabouts have proven to be effective in reducing accidents and improving traffic flow, making this a significant enhancement for the community.  In addition to the roundabout, the project will eventually tie into planned improvements at the I-25 and Happy Canyon interchange.  By including a roundabout at this intersection, the City aims to ensure a seamless transition into the final construction phase of the bridge and interchange project.

To get a better understanding of what the intersection improvements will look like, residents can access a visualization of the project area, including the roundabout design, on the City of Castle Pines website.

For those who have questions or would like more information about the project and to view the visualization of the project visit


By Bear Rothe; graphic courtesy of the City of Castle Pines




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