In observance of the Juneteenth federal and state holiday, all Douglas County Government offices will be closed Wednesday, June 19. Offices will reopen on Thursday, June 20, for normal business.



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Public Works

Happy Canyon Road and Lagae Road Intersection Roundabout

Under Construction

Project Manager

Larry Nimmo, Project Manager - City of Castle Pines Project
[email protected] 303-705-0200


  • City of Castle Pines
  • Douglas County Government

Project Update

Updated May 16, 2024

Traffic impacts: A road closure will be in place during construction on Lagae Road, between Happy Canyon Road and Chase Lane, beginning Saturday, Feb. 24. Detours will be in place via Castle Pines Parkway to access I-25 or Happy Canyon Road. Construction is anticipated to be completed by July 2024.

City of Castle Pines Project website for Happy Canyon Rd and Lagae Rd Intersection Roundabout

To view a 3-D visualization of the project area, including the roundabout design, click here


Design and engineering activities began in 2023 for intersection improvements to the Lagae Road and Happy Canyon Road intersection. Douglas County is partnering with the City of Castle Pines with a financial contribution to the project in the amount of $1.5 million.

Project improvements will include:

  • A roundabout at the intersection of Lagae Road and Happy Canyon Road
  • Safety and traffic flow efficiency improvements

This work will be completed as a part of an early action item for the eventual improvements to the I-25 and Happy Canyon Road bridge and interchange. The roundabout will tie into the eventual final construction of the bridge/interchange project.

Project Photos