Upper Big Nemaha 3-A is a vital earth dam located in Johnson, Nebraska, designed by the USDA NRCS in 1985 for flood risk reduction along the TR-Mid Br Big Nemaha River. This structure, owned by the local government, stands at a height of 43.5 feet with a storage capacity of 1412.7 acre-feet and a drainage area of 3.4 square miles. With a low hazard potential and satisfactory condition assessment, the dam plays a crucial role in mitigating potential flooding events in the area.

Operated and regulated by the Nebraska Department of Natural Resources, Upper Big Nemaha 3-A undergoes regular inspections, with the last assessment conducted in May 2017, affirming its structural integrity. With a primary purpose of flood risk reduction, this dam serves as a critical component in the local water resource management system, safeguarding the surrounding community from potential inundation. The dam's design, featuring stone core and soil foundation, ensures its effectiveness in controlling water flow and protecting downstream areas from excess discharge.

With a comprehensive emergency action plan and adherence to regulatory guidelines, Upper Big Nemaha 3-A exhibits a commitment to proactive risk management and safety measures. As climate change continues to impact precipitation patterns and increase the frequency of extreme weather events, structures like this earth dam play a vital role in ensuring the resilience and sustainability of water resources in the region. As water resource and climate enthusiasts, understanding the significance of infrastructure like Upper Big Nemaha 3-A is crucial in addressing the challenges posed by a changing climate and safeguarding communities against the impacts of flooding.