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Public Works

West Frontage Road Relocation (aka Dawson Trails Blvd.)

Under Construction

Project Manager

Town of Castle Rock
[email protected] 720-733-6097

Project Update

Updated April 10, 2025

Construction started on Sept. 9, 2024. The estimated 18-month road closure will allow crews to safely build the new interchange and relocate this portion of the West Frontage Road to its new permanent location, west of the BNSF Railway tracks.

Description

The West Frontage Road Relocation (Dawson Trails Boulevard) is part of a series of projects that will improve access and safety at the southern end of Castle Rock.

To accommodate construction of the new southbound I-25 on- and off-ramps at Crystal Valley Parkway, crews must relocate the current West Frontage Road that is east of the BNSF railroad tracks to the west side of the BNSF railroad tracks. The new road will be called Dawson Trails Boulevard.

This project, which will connect with the future Crystal Valley interchange, will enhance the roadway network, eliminate unnecessary railroad crossings, and provide a new west connection between Crystal Valley and Tomah Road interchanges.

Douglas County and the Town of Castle Rock have partnered to construct Dawson Trails Boulevard. Construction of Dawson Trails Boulevard will be split into two segments with one section being constructed by Douglas County:

  • South section (Douglas County) – Douglas County’s section of Dawson Trails Boulevard spans from the Tomah Road/Bear Dance intersection to the southern town limits (approximately 1 mile).
  • North section (Town of Castle Rock) – The Town of Castle Rock’s section of Dawson Trails Boulevard spans from the southern town limits (which roughly coincides with the location of the Lowell property along the existing West Frontage Road) to the future Crystal Valley interchange.

Construction hours will be Monday through Friday, from 7 a.m. to 7 p.m. Saturday work may occur if approved by the Douglas County engineer. There will be no construction work on major holidays.

Once complete in fall 2025, improvements to the southern section of Dawson Trails Boulevard will include:

  • Widened lanes near Tomah to accommodate an eastbound left turn lane.
  • Mill and overlay of the existing Tomah Road pavement.
  • Shifted lanes on Bear Dance Drive to align with the new West Frontage Road/Dawson Trails Boulevard alignment.

West Frontage Road Relocation Plan

Town of Castle Rock’s Project webpage

Project Photos