In Davenport, Scott Co. About three miles downriver on U.S. 61 from the U.S. 67 bridge into Rock Island, Ill., turn left on S. Concord and proceed one mile to Wapello Ave. Turn right on Wapello and the entrance to the marsh will be on your right, just over the railroad tracks. There is also viewing of marsh and shorebird habitat a little past the main entrance along Wapello, on the right side of the road.