Upper Big Nemaha 18-B is a local government-owned dam located in Gage, Nebraska, designed by the USDA NRCS. Completed in 1980, this earth dam stands at a height of 48 feet, with a structural height of 53 feet and a length of 1410 feet. The dam serves the primary purpose of flood risk reduction along the TR-Hooker Creek, with a drainage area of 11.4 square miles and a storage capacity of 3768.7 acre-feet.

With a low hazard potential and a satisfactory condition assessment, Upper Big Nemaha 18-B offers reliable flood protection for the surrounding area. The dam is regulated by the Nebraska Department of Natural Resources, with state permitting, inspection, and enforcement in place to ensure its proper operation and maintenance. The last inspection in October 2020 found the dam to be in good condition, with an inspection frequency of every 5 years to assess its performance and safety.

As a crucial infrastructure for managing water resources in the region, Upper Big Nemaha 18-B plays a vital role in mitigating flood risks and protecting the local community from potential disasters. With its strategic location and design features, this earth dam serves as a key asset in the overall water resource and climate management efforts in Nebraska, showcasing the importance of effective dam infrastructure in safeguarding against natural hazards and promoting sustainable development.