Caballo Reservoir is a water storage facility located in southern New Mexico, constructed in 1938 by the Bureau of Reclamation. The reservoir has a capacity of 220,000 acre-feet and is primarily fed by the Rio Grande river. The hydrology of Caballo Reservoir is dependent on surface flow from the Rio Grande and snowpack from the surrounding mountains. The reservoir provides water for agricultural irrigation and municipal use in the surrounding areas, and is also used for recreational activities such as boating and fishing. Some of the major snowpack providers for Caballo Reservoir include the Black Range, Sierra Blanca, and San Andres Mountains. The reservoir has played a significant role in the development of the area's agricultural industry, and continues to provide critical water resources for the region.