Longhorn Lake is a managed freshwater training lake in League City with easy shore access, scuba platforms, sunken practice objects, and open-water space for swimming and triathlon training. The bottom is silty with algae and vegetation, visibility can swing with bottom disturbance, and the lake supports freshwater fish and a steady training scene. Divers should expect a buddy-based, waiver-driven venue with shared water use and a calm lake profile rather than current or surge. No coral is present, so the focus stays on training features, careful buoyancy, and respecting the other users on the water.