is on the Avenue G Island. The Sinnissippi Dam Walkway and Martin's Landing officially opened on September 20, 2008, after years of combined effort from the Sterling Park District, the City of Sterling, the City of Rock Falls, the Coloma Township Park District and the Illinois Department of Natural Resources. The Sinnissippi Dam Walkway provides a link between the ever-expanding trail system in Sterling and the Hennepin Feeder Canal in Rock Falls. The Sinnissippi Dam Walkway offers bicyclists, runners, walkers and other recreational users a safe and scenic route across the Rock River and Martin's Landing is the welcoming point to Sterling and the entry to the ever-expanding trail system in Sterling. Martin's Landing and the Sinnissippi Dam Walkway are at 10th Avenue and 2nd Street (behind the Dillon Home Museum). In 1968, the Park District received a recreational lease from the United States Army Corps of Engineers on , which is now known as Harry Oppold Marina. In 1971, the Harbor House, park roads and lighting, a launch ramp, a main dock and parking lots were developed through a 100% funded grant. Since the leasing of Oppold, Oxbow Lake was dredged and boat slips, two picnic shelters, picnic units, playground areas, landscaping, and more has been added. Oppold Marina is on Stouffer Road. The Propheter Park property was donated to the Sterling Park District in 1986 by Bob Propheter. The park was named and dedicated in his honor. Propheter Park is at 6th Avenue and East 6th Street. In 1967, the Park District acquired the site known as Scheid Park. In the late 1990s, major renovations include improvement of the basketball courts, soccer field, playground equipment, and the addition of a shelter. Scheid Park is at Woodburn Avenue and West 11th Street. The largest of the Sterling Park District parks, Sinnissippi Park was acquired in parcels beginning in 1934. It is the site for Hopewillian Indian Mounds, which is on the National Register of Historic Places. Sinnissippi Park is linked to Hoover Park via the S.M.A.R.T. trail system. Sinnissippi Park is on Sinnissippi Road. The Skate Park was built in 2004 by the Sterling Park District. It is behind the Duis Recreation Center and the Frasor Center at St. Mary's Road and Third Avenue. It is no longer operational and was taken down in the summer of 2020 due to vandalism and falling popularity of skate park related sports.