Dunlap Dam 1, located in Sioux County, Nebraska, is a privately owned structure designed by USDA NRCS for irrigation purposes on the TR-South Antelope Creek. Completed in 1952, this earth dam stands at a height of 18 feet with a hydraulic height of 14 feet. It has a length of 708 feet and a storage capacity of 69 acre-feet, serving the surrounding area with a normal storage of 16 acre-feet.

Despite its low hazard potential, Dunlap Dam 1 is rated as being in poor condition as of the last inspection in 2013. The dam is regulated by the Nebraska Department of Natural Resources and is subject to state permitting, inspection, and enforcement. With a drainage area of 0.4 square miles and a maximum discharge of 450 cubic feet per second, this dam plays a crucial role in maintaining water resources for irrigation in the region. For water resource and climate enthusiasts, Dunlap Dam 1 serves as a key infrastructure supporting agricultural activities in the area, highlighting the importance of proper maintenance and oversight to ensure its continued functionality and safety.