Osseo, located in Trempealeau County, Wisconsin, is home to the Osseo Roller Mill, a local government-owned dam on the South Fork Buffalo River. This gravity dam, completed in 1860, serves primarily for recreation purposes and stands at a height of 14 feet with a structural height of 14 feet and a length of 451 feet. The dam has a storage capacity of 100 acre-feet and a drainage area of 38.9 square miles, making it a significant feature in the area.

With a high hazard potential and a satisfactory condition assessment, the Osseo dam is regulated by the Wisconsin Department of Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and compliance. The risk assessment for the dam is categorized as very high, emphasizing the importance of proper management measures and emergency preparedness. Despite being an older structure, the Osseo Roller Mill dam continues to provide recreational opportunities and serves as a valuable asset to the community.

In recent years, the dam has undergone modifications in 1937 and 1997, showcasing efforts to maintain and improve its functionality. With a controlled spillway and a maximum discharge of 2000 cubic feet per second, the Osseo dam remains a key feature in the area's water resource management. As water resource and climate enthusiasts, understanding the significance of structures like the Osseo Roller Mill dam in maintaining water availability and safety is crucial for sustainable development and environmental stewardship in the region.