Upper Little Nemaha 26 is a crucial flood risk reduction structure located in Lancaster, Nebraska, along the TR-Little Nemaha River. Built in 1998, this earth dam stands at a height of 37 feet, with a hydraulic height of 36 feet and a structural height of 42 feet. With a storage capacity of 640 acre-feet and a drainage area of 2.5 square miles, this dam plays a vital role in mitigating flooding in the region.

Owned by the local government, Upper Little Nemaha 26 is regulated and inspected by the Nebraska Department of Natural Resources. The dam has a low hazard potential and was last inspected in 2016, with a satisfactory condition assessment. Its primary purpose is flood risk reduction, with a normal storage capacity of 93 acre-feet. Despite its age, the dam continues to effectively protect the surrounding area from potential flood events.

Located in Palmyra, Nebraska, Upper Little Nemaha 26 is situated in Congressional District 01, represented by Jeff Fortenberry. With its stone core and soil foundation, this dam is a crucial component of the flood management infrastructure in the region, safeguarding the community from potential water-related disasters.