O'Brien Mockenhaupt Dam, located in Cass County, Nebraska, was completed in 1981 by the USDA NRCS and is currently privately owned. This Earth-type dam stands at a height of 30 feet with a hydraulic height of 26 feet, serving primarily for flood risk reduction purposes. With a storage capacity of 152 acre-feet and a drainage area of 0.5 square miles, the dam plays a crucial role in managing water resources in the region.

Despite its low hazard potential, the dam is in poor condition, as assessed in May 2018. The dam has a structural height of 34 feet and a length of 478 feet, with a spillway type not specified. The inspection frequency is every five years, highlighting the importance of regular maintenance and monitoring to ensure the dam's safety and functionality. The dam is regulated by the Nebraska Department of Natural Resources, with state permitting, inspection, and enforcement protocols in place.

Named after O'Brien Mockenhaupt, this dam on TR-DECKER CREEK is vital for reducing flood risks and managing water resources in the area. As a significant structure in the region, it is essential for water resource and climate enthusiasts to stay updated on its condition and any potential maintenance or improvement measures to ensure its continued effectiveness in protecting the community and the environment.