Theresa Vap Dam, located in Clay County, Nebraska, was completed in 1984 and is primarily used for irrigation purposes. Managed by a private owner, the dam stands at a height of 15 feet with a hydraulic height of 14 feet and a structural height of 18 feet. With a storage capacity of 67 acre-feet, the dam serves to regulate water flow from the TR-Liberty Creek, covering a drainage area of 0.5 square miles.

Designed by the USDA NRCS, Theresa Vap Dam is constructed of earth and stone materials on a soil foundation. It spans 300 feet in length and has a surface area of 5 acres, with a maximum discharge capacity of 140 cubic feet per second. The dam is regulated by the Nebraska Department of Natural Resources and undergoes regular state inspections and enforcement to ensure its integrity and safety. Despite being classified as having a low hazard potential, the dam's condition assessment in 2018 was rated as fair.

The dam's location in Deweese, Nebraska, contributes to the local irrigation efforts and water resource management in the region. With a focus on sustainable water usage and environmental conservation, Theresa Vap Dam plays a crucial role in supporting agricultural activities and maintaining water quality in the area. Enthusiasts of water resources and climate management can appreciate the dam's design, function, and importance in the broader context of sustainable water management practices.