JOHNSON'S RANCH MARINA, located on Caddo Lake in Uncertain, Texas, is the oldest inland marina still operating in the State of Texas. Caddo Lake is the only natural lake in Texas (and was the only lake until the construction of reservoirs.) JOHNSON'S RANCH has been serving the sportsmen of Texas since 1908. Johnson's Ranch has the only boat gasoline on Caddo Lake. Their 93 Octane Super Unleaded will keep your motors running smoothly.