Jones Dam 821, located in Dawes, Nebraska, is a privately-owned irrigation dam designed by the USDA NRCS in 1962. The dam stands at a height of 16 feet, with a hydraulic height of 15 feet and a structural height of 20 feet. It has a length of 2200 feet and provides a storage capacity of 189 acre-feet for irrigation purposes.

Despite its low hazard potential, Jones Dam 821 is in poor condition as of the last assessment in July 2019. The dam is regulated by the Nebraska Department of Natural Resources, with state permitting, inspection, and enforcement in place. The dam's primary purpose is irrigation, serving the surrounding area with a normal storage capacity of 37 acre-feet and a maximum discharge of 740 cubic feet per second.

Located on the TR-White River, Jones Dam 821 plays a crucial role in water resource management in the region. As water resource and climate enthusiasts, it is important to monitor and assess the condition of dams like Jones Dam 821 to ensure they continue to serve their intended purposes effectively and safely in the face of changing environmental conditions.