Upper Big Nemaha G-33 is a local government-owned earth dam located in Gage County, Nebraska, along the Big Nemaha River. Built in 1983 by the USDA NRCS, this dam stands at a height of 28 feet and spans 990 feet in length, providing flood risk reduction and other purposes for the community. With a storage capacity of 152 acre-feet and a drainage area of 0.5 square miles, Upper Big Nemaha G-33 plays a critical role in managing water resources in the region.

Managed by the Nebraska Department of Natural Resources, Upper Big Nemaha G-33 has a low hazard potential and is deemed to be in satisfactory condition as of the last inspection in March 2020. Despite its age, the dam continues to effectively serve its purpose, with a normal storage capacity of 59 acre-feet and a maximum discharge rate of 159 cubic feet per second. With state-regulated permitting, inspection, and enforcement in place, this dam exemplifies responsible water resource management and climate resilience efforts in the area.

As part of the Omaha District, Upper Big Nemaha G-33 benefits from the expertise and oversight of the USDA NRCS, ensuring that the dam meets regulatory standards and remains structurally sound. With its stone core and soil foundation, this earth dam is a testament to the collaboration between local government and federal agencies in safeguarding communities from potential flooding events. As climate change impacts water resources, the importance of well-maintained structures like Upper Big Nemaha G-33 cannot be understated in ensuring the safety and sustainability of the region's water supply.