Crain Dam, located in Ringgold County, Iowa, is a vital water resource for the city of Mt. Ayr, serving multiple purposes including fire protection and maintaining a small fish pond. Constructed in 2006 by the NRCS, this earth dam stands at a height of 27 feet and stretches 469 feet in length. With a storage capacity of 28 acre-feet and a surface area of 2.8 acres, the dam plays a crucial role in regulating the flow of Walnut Creek.

Despite its low hazard potential and moderate risk assessment, Crain Dam is state-regulated and subject to regular inspections by the Iowa DNR. The dam features an uncontrolled spillway and is designed to withstand potential emergencies. Its condition is currently rated as "Not Rated," indicating the need for ongoing monitoring and maintenance to ensure its structural integrity and continued functionality. For water resource and climate enthusiasts, Crain Dam represents a key infrastructure contributing to the sustainable management of water resources in the region, highlighting the importance of responsible dam operation and maintenance in the face of changing climate conditions.