From Quad Cities Friends of Off Road Cycling website:
Sylvan Island Park is a great urban trail system located in Moline, Illinois just 3/4 mile West of the John Deere Commons and the iWireless Center (formerly the Mark of the Quad Cities). The island was once home to a steel mill from which remnants can still be seen such as concrete loading docks and building foundations, railroad tracks, rebar, and loose rock. Despite few elevation changes, the unique nature of the islandâ€™s trails makes Sylvan Island Park a fun yet challenging and technical place to ride. The soil composition at Sylvan Island allows for quick drying after precipitation often making it the first available trail system to ride in the Quad Cities following rain. Sylvan Island is always the first venue for the I-74 Mountain Bike Race Series because of its resilient riding conditions.