Check out this drone video of one of the largest lakes in the Southeastern Lake, compliments of content creator and pilot psittason. Lewis Smith Lake (often simply "Smith Lake") is actually a reservoir (artificial) lake created by the Lewis Smith Dam on the Black Warrior River, one of the largest dams in the eastern United States. The lake covers about 85 square km or around 30 square mi. when full, and has a shoreline of about 800 km (around 500 mi.). With a maximum depth of 80 meters (264 ft.), it's the deepest lake in the state.