Upper Big Nemaha 9-B is a local government-owned dam in Gage, Nebraska, designed by USDA NRCS and regulated by the Nebraska Department of Natural Resources. Completed in 1991, this earth dam stands at a height of 36 feet and serves multiple purposes, including flood risk reduction. With a storage capacity of 1,789 acre-feet and a drainage area of 4.2 square miles, this structure plays a vital role in water resource management in the region.

Located on the Mid Branch of the Big Nemaha River, Upper Big Nemaha 9-B has a low hazard potential and is currently assessed to be in fair condition. Although the dam has a spillway type unspecified, it has a maximum discharge capacity of 2,581 cubic feet per second. The dam's inspection frequency is every five years, with the last assessment conducted in May 2020, indicating a commitment to ensuring the structure's safety and effectiveness in mitigating flood risks and managing water resources in the area.

With its strategic placement and design features, Upper Big Nemaha 9-B contributes significantly to water resource management and flood risk reduction efforts in Gage, Nebraska. As a crucial piece of infrastructure, this earth dam, managed by local government authorities and the USDA NRCS, plays a vital role in protecting the surrounding community from potential water-related hazards. The dam's fair condition and regular inspections underscore the commitment to maintaining its functionality and ensuring the safety of residents and properties downstream.