There are more than 6000 lakes in Texas, but the vast majority of these are reservoirs formed by dams along creeks and rivers. There are just over 300 navigable lakes in Tex…as. In total Texas lakes impound over 4,959 square miles of fresh water. * There is an arguable claim that there is only 1 natural lake in Texas, that being Caddo Lake on the NW Louisiana border. However, this neglects some oxbow lakes along the major rivers that may only be seasonally filled.