Mud Creek Subwatershed Site 8-1 is a dam located in Woodbury, Iowa, specifically in the city of Moville. This earth dam, constructed in 1973 with a height of 33 feet and a length of 486 feet, serves multiple purposes including fire protection, stock, and small fish pond management. It has a storage capacity of 42 acre-feet and covers a surface area of 2.6 acres, with a drainage area of 0.15 square miles. The dam is regulated by the Iowa Department of Natural Resources and is designated for flood risk reduction as well.

Managed by the Natural Resources Conservation Service, this low-hazard dam on TR-Mud Creek provides essential water resource management benefits to the surrounding area. With a moderate risk assessment rating, the dam's condition is currently not rated, and there is no emergency action plan in place. Despite these factors, the dam continues to play a crucial role in mitigating flood risks and providing water for various uses including fire protection and livestock maintenance. The presence of this dam highlights the importance of sustainable water resource management practices in the face of changing climate conditions.