From the record
“The Hennepin Canal State Trail, also just called the Hennepin Canal, is an abandoned waterway in northwest Illinois, between the Mississippi River at Rock Island and the Illinois River near Hennepin. The entire canal is listed on the National Register of Historic Places.”
Wikipedia article Hennepin Canal Parkway State Park, CC BY-SA 4.0.
One of 19 National Register listings published here for Bureau County · listed in 1978 · category: District · built in 1970.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service