The Duck Creek Aqueduct carries the canal and boats above Duck Creek, keeping the canal level across the creek and other dips in the land because canal water must remain completely level rather than run downhill. Floodwaters destroyed the original aqueduct in 1847, and engineers and construction teams replaced it with a covered Burr arch truss structure. It is the only known wooden covered aqueduct still operating in the United States, and it is listed on the National Register of Historic Places and recognized as a National Civil Engineering Landmark. The aqueduct is 80 feet long, 17 feet and 7 inches wide, and stands 16 feet above Duck Creek. It is a double Burr arch truss, with each side having two 75 foot arches made of Indiana poplar, and its beams and kingpost are encased within the arches. Two floodgates on each side release extra water to keep the canal level. It was first completed in 1846, built as a covered Burr arch truss in 1847, rebuilt in 1949, and restored in 2016.