The existing box culvert was built in 1936 and is in poor condition. Erosion occurs on the Route D embankment due to frequent overtopping during heavy rain events. The project will replace the existing box culvert with a larger box culvert. The project also includes raising the grade of Route D about 18” to reduce the frequency of roadway overtopping (flooding.) For updates and contact information, visit www.modot.org/route-d-culvert-replacement-st-charles.