Mc Donnell Dam, located in Ringgold County, Iowa, is a private-owned earth dam completed in 2004 for fire protection, stock, and small fish pond purposes. Managed by the Iowa Department of Natural Resources, this low-hazard dam holds a storage capacity of 20 acre-feet and serves as a vital resource for the surrounding area. With a structural height of 28 feet and a length of 320 feet, the dam is situated on the TR- Middle Fork Grand River, within the Rock Island District.

Despite its low hazard potential, Mc Donnell Dam is subject to state regulation, inspection, and enforcement to ensure its safety and functionality. The dam features an uncontrolled spillway and has a moderate risk assessment rating of (3). Although the condition assessment is currently listed as "not rated", the dam's risk management measures are in place to mitigate any potential risks associated with its operation. Overall, Mc Donnell Dam is a crucial infrastructure for water resource management and climate adaptation in the region, providing a sustainable solution for local water needs.