Rock Island Trail State Park is a state park under construction in the U.S. state of Missouri that will be a 47-mile (76 km) rails to trails hiking and biking trail. Work on the trail should be completed by the end of 2016. When opened the trail will provide residents of the Kansas City region direct trail access to the 240 mi (390 km) Katy Trail State Park, the longest rails to trails trail in the U.S. The Rock Island Trail uses abandoned right-of-way of the Chicago, Rock Island and Pacific Railroad between Pleasant Hill in Cass County and Windsor in Henry County where it meets the Katy Trail.