W W W . V I S I T P E L L A . C O M 38 W W W . V I S I T P E L L A . C O M 38 WelcometotheLake! LAKE RED ROCK is Iowa's largest lake with over 15,000 acres of water and 35,000 acres of land for your enjoyment. Located on the Des Moines River just 45 miles southeast and downriver from Des Moines and only 4 miles from Pella, the reservoir collects runoff and drainage from over 12,320 square miles of Iowa and southern Minnesota. Numerous recreational opportunities and natural resources abound on the water and surrounding public lands.