Four Corners

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 2 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. 

This project is a collaborative effort between the Town of Castle Rock, Douglas County and the Colorado Department of Transportation. Construction is anticipated to be complete in late 2024.

Project map

Map of the Four Corners, where Founders Parkway, Fifth Street, State Highway 86 and Ridge Road meet

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