Gutermuth Road/Route 364 Interchange

The project is being managed by St. Charles County Highway Department with oversight by MoDOT, and is a cooperative effort funded by St. Charles County, MoDOT, and the Federal Highway Administration (FHWA) to improve traffic flow and stimulate economic development. 

Where: At the intersection of Gutermuth Road with Route 364.  The work extends approximately 1,300 feet along Gutermuth Road and 3,900 feet along Route 364.

What: The project includes:

  • Grading and paving along Gutermuth Road and Route 364 for new interchange ramps
  • Acceleration and deceleration lanes
  • Roundabouts at the ramp termini on Gutermuth Road
  • Retaining walls and sound walls along certain portions of Route 364
  • Interchange lighting and signing

View exhibit map of proposed improvements (PDF).

Why: The proposed improvements are intended to reduce congestion at the Mid Rivers Mall Drive and Highway K interchanges on Route 364, by providing a new access point within that lengthy 4.4 mile stretch. The roadway will improve travel times, reduce delays, and provide more direct access to the largely residential area of Cottleville and surrounding communities.

When: Construction of the new interchange started Feb. 17, 2020.

The interchange project will cost $5.5 million and is expected to be open to traffic by the end of 2020. 

Current Phase

Minor clean-up and minor repairs remain. 

Updated 2/22/2021