Gross habitat features were mapped in the Clinch River, South Fork of the Holston River, Watauga River, and Caney Fork River using GPS receivers and GIS software. These habitat surveys complimented surveys of the fate of trout stocked into each river. Each of these regulated rivers is managed as a put-and-take, or put-grow-and-take fishery for rainbow trout Oncorhynchus mykiss and brown trout Salmo trutta. The amount of trout habitat in these rivers varied widely, as did the biomass of trout each system supported. Standing stocks of overwintering trout were highest in the South Fork of the Holston River (170 - 232 kg/ha) and lowest in the Caney Fork River (41-74 kg/ha). Not surprisingly, the South Fork of the Holston River had the highest ratio of riffles and runs to pools; whereas, the Caney Fork River had a very low ratio of riffles and runs to pools (1.2 / 1 / 1.85, respectively). Although tentative relations between habitat and carrying capacities in these four tailwaters have been developed, these relations are confounded by the influence of other factors such as minimum flows, frequency of high discharge events, and water quality.