CTH O Grandma’s Creek Box Culverts
Client: Wisconsin Department of Transportation
Location: Sheboygan, Wisconsin
Donohue designed two reinforced concrete box culverts on CTH O for consecutive crossings of the meandering Grandma’s Creek. The width of the culverts accommodates two lanes of traffic, bike lanes, and sidewalk.
One culvert opening is 11 feet x 14 feet and the other is 11 feet x 16 feet. Donohue realigned the creek on the eastern structure to match its historic location and designed a skewed culvert in order to improve the creek hydraulics.
The design of each culvert included a deep channel for fish passage and measures to enhance the amphibian environment. A parallel 1,000-foot long wingwall was used on the east structure as a retaining structure to minimize impacts to the stream and adjacent wetlands. A scenic overlook, with decorative railing, were provided for the enjoyment of pedestrians and bicyclists.