Nepple Dam, located in Floris, Iowa, was completed in 2000 by the USDA NRCS and serves as a vital resource for fire protection, stock, and small fish pond purposes. This private earth dam stands at a height of 27 feet, with a length of 180 feet, and a storage capacity of 24 acre-feet. Situated on TR-PEPPER CREEK, this dam is designed with a stone core and soil foundation, making it a low hazard potential structure with a moderate risk assessment.

Despite not being state-regulated or permitted, Nepple Dam plays a crucial role in water resource management in Davis County, Iowa. With a surface area of 1 acre and a drainage area of 0.16 square miles, this uncontrolled spillway dam provides essential water storage and flood control capabilities for the region. Although its condition assessment is currently not rated, Nepple Dam's strategic location and design make it a valuable asset for the community, ensuring water availability for various needs while minimizing potential risks.