Lower Nine Mile is a privately owned gravity dam located on Nine Mile Creek in Oneida County, Wisconsin. Constructed in 1907, the dam serves primarily for hydroelectric power generation and flood risk reduction purposes. Standing at a height of 12 feet and spanning 186 feet in length, the dam has a storage capacity of 2,617 acre-feet and a maximum discharge of 704 cubic feet per second.

Managed by the Federal Energy Regulatory Commission, Lower Nine Mile has a low hazard potential and is categorized as a very high-risk structure. Despite its age, the dam has not undergone condition assessment, but emergency action plans have been prepared and updated periodically. The dam features a controlled spillway with a width of 26 feet and is equipped with slide and tainter gates for water release.

Enthusiasts in water resource management and climate change can find interest in Lower Nine Mile for its historical significance and the operational challenges it faces as a key infrastructure for hydroelectric power generation in the region. The dam's location within a state-regulated jurisdiction in Wisconsin offers a unique insight into the regulatory framework governing dam safety and maintenance practices, making it a valuable case study for sustainable water resource management in the face of changing climate conditions.