Lake Altus at Lugert is a man-made reservoir located in southwestern Oklahoma. The lake was built in 1946 as part of a flood control and irrigation project. Its primary purpose is to provide water for irrigation, but it is also used for recreational activities such as fishing, boating, camping, and hiking.

The hydrology of Lake Altus is primarily fed by the North Fork of the Red River and Elm Creek, which are both located in the Wichita Mountains. The lake's surface area is approximately 6,260 acres, and its maximum depth is 118 feet. The average depth of the lake is around 40 feet.

Lake Altus is heavily dependent on snowpack and rain for its water supply. The lake receives water from various sources, including the snowmelt from the Wichita Mountains and precipitation from surrounding areas. Agricultural use of the water from the lake is also significant, with the water used for irrigation in the surrounding farmland.

In summary, Lake Altus at Lugert is a man-made reservoir built for flood control and irrigation purposes. It is primarily fed by the North Fork of the Red River and Elm Creek, and its water supply is dependent on snowpack and rain. The lake is also used for recreational activities and agricultural use.