Four Corners

Construction begins Oct. 4

  1. Improvements are coming to the Four Corners intersection to increase safety, reduce congestion and keep you moving throughout Castle Rock.

    Throughout the duration of the project, please watch for changing traffic patterns and daytime and nighttime lane closures. Access impacts to local businesses may be required intermittently. The project team will maintain access, although a short detour may be required. Please plan for some delays while traversing this intersection. Signs along the roadside will provide the most updated information.

    Join the email list to stay informed about the project's progress.

Four Corners intersection improvements

This project includes intersection reconstruction, roadway widening, signal upgrades and accessibility improvements. 

The work will help alleviate roadway congestion, increase mobility for vehicular, pedestrian, and bicycle traffic and create a safer experience for all travelers at this major intersection. 

Once completed, the project will feature the following elements:

  • Additional through lane in all directions
  • Double dedicated left-turn lanes on northbound Ridge Road and southbound Founders Parkway
  • Upgrades to the traffic signal
  • Crosswalk improvements and trail connections

Castle Rock is one of the fastest-growing towns in Colorado. This growth brings many positive changes to our community but also has led to some traffic safety and operational issues as this growth outpaces funding for transportation improvements. 

Aerial photograph of the Four Corners intersection.In 2017, the Castle Rock Transportation Master Plan identified the need for improvements at the Four Corners intersection, located approximately two miles east of Downtown. This intersection of Founders Parkway, Fifth Street, State Highway 86, and Ridge Road currently serves more than 30,000 vehicles per day - a number that is expected to increase to more than 48,000 vehicles per day by 2040. This intersection also has a high crash rate and lacks connections/safe accommodations for bicyclists and pedestrians.

To address these safety and operational issues, the Town plans to improve the intersection with a solution that will last well into the future. The Town successfully secured regional funds through the Denver Regional Council of Governments to complete the design and construction of these improvements. The project is scheduled to be complete in late 2024.

Project area map

Project area map. A circle is drawn around the traffic signal at the Four Corners intersection.

Project updates

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  1. What are the planned improvements?
  2. Will access to nearby business and commercial properties south of 5th Street/Hwy 86 be maintained or improved?
  3. Does the Town plan to improve Hwy 86, Ridge Road, and Fifth Street to allow the Four Corners intersection to operate well?
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