2024 Monarch Boulevard Reconstruction

Project Overview

As a part of the 2024 Road Solutions projects, reconstruction efforts will begin this spring on Monarch Boulevard between Castle Pines Parkway and Glen Oaks Avenue. The project improvements included:

      • Complete roadway tear out and asphalt replacement
      • Safety enhancements
      • Stormwater infrastructure improvements
      • Six-foot bike lanes
      • 4,300 feet of new water line by the Castle Pines North Metropolitan District

If you have questions about the project, please email monarch@castlepinesco.gov or call 303-705-0200.


  • Project start: March 17, 2024
  • Anticipated completion: September 2024

What to Expect

  • Starting March 17, 2024, Monarch Boulevard will be closed to through traffic to allow for the efficient completion of this project, anticipated by September 2024. This closure will ensure the safety of both our workers and the traveling public, and we have established clear detour routes to minimize inconvenience.
  • The project will be done in two phases. Phase One will begin on March 17, and Phase Two will begin once Phase One is completed. We will update the community as the project progresses.
  • The installation of a new water line during the road construction will allow an upgrade to the Castle Pines North Metropolitan District water infrastructure. It will also decrease costs by completing both projects simultaneously. It will also reduce the overall project duration and traffic impacts compared to two separate projects.
  • A full closure of Monarch Boulevard will be in place to expedite the project and maintain safety for residents and construction crews. Please visit the website to view a map of the work and to view a map of Phase One.
  • Homes within the road closure area will remain accessible. This access will be exclusively for local traffic and emergency services only.

Traffic Closures DetoursĀ 

View the detour route below for more information about the road closure and available detour routes. Click on each image to view a larger image of the map.

A map showing detour routes for the Monarch Boulevard reconstruction project,

Project Visualizations

Click on the video below to see a rendering of the Monarch Boulevard reconstruction and improvements.


View the images below for renderings of the project. These images are representative in nature and may differ from the completed project. Click on each image to view a larger version of the rendering.

Aerial rendering of the reconstruction project on Monarch Boulevard.

Aerial rendering of the reconstruction project on Monarch Boulevard.

Aerial rendering of the reconstruction project on Monarch Boulevard.

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Want to learn more about our long-term Road Solution?

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.