[1] The maximum depth is 40 feet, and was impounded in 1972 by the Monticello Reservoir, which also disconnected it from Lake Bob Sandlin.

[2] Lake Monticello is part of a 5,700 acres (23 square kilometres) property owned by the Hortenstine Ranch Company, and is one of the largest privately owned lakes in Texas.

The lake was opened to the public in 1973, and was popular to recreation.

The lake was used for cooling the Monticello power plant.

Access to the boat ramp was restricted in 2019, and it was later closed to the public.