 Parts of the river itself are designated for recreational or <unk> use . The Missouri National Recreational River consists of portions of the Missouri downstream from Fort Randall and Gavins Point <unk> that total 98 miles ( 158 km ) . These reaches exhibit islands , meanders , <unk> , underwater rocks , <unk> , <unk> , and other once @-@ common features of the lower river that have now disappeared under reservoirs or have been destroyed by channeling . About forty @-@ five steamboat wrecks are scattered along these reaches of the river . 
