Wilhelmi Dam, located in Adel, Iowa, is a privately owned structure designed by the USDA NRCS and regulated by the Iowa Department of Natural Resources. Completed in 2002, this earth dam stands at a height of 30 feet and stretches 425 feet in length, with a maximum storage capacity of 88 acre-feet. Its primary purpose is for fire protection, stock, or small fish pond use, serving as a vital resource for the local community.

Situated on the TR- North Raccoon River, Wilhelmi Dam has a surface area of 5.9 acres and a drainage area of 0.21 square miles. With a low hazard potential and moderate risk assessment, this dam plays a crucial role in water resource management in Dallas County, Iowa. Despite its relatively small size, Wilhelmi Dam serves as an important infrastructure for maintaining water supply, especially during times of dry spells or emergencies.

With its uncontrolled spillway type and soil foundation, Wilhelmi Dam exemplifies the collaboration between private ownership, federal agencies, and state regulators in ensuring water safety and management. As a key component of the local ecosystem and watershed, this dam underscores the importance of sustainable water resource practices and climate resilience in the face of changing environmental conditions.