Gray Dam, located in Villisca, Iowa, is a private-owned structure designed by the USDA NRCS with a primary purpose of fire protection, stock, or small fish pond. Completed in 1989, this earth-type dam stands at a height of 39 feet and stretches 340 feet in length, with a storage capacity of 20 acre-feet and a drainage area of 0.06 square miles. The dam, situated on the TR-West Nodaway River, is regulated by the Iowa Department of Natural Resources and is inspected, permitted, and enforced by state authorities, ensuring its safe operation.

With a low hazard potential and a moderate risk assessment rating, Gray Dam has not been officially rated for its condition but is deemed to be in satisfactory standing. Despite its uncontrolled spillway type and lack of outlet gates, the dam has not undergone any modifications since its completion. The surrounding area, covering a surface area of 2 acres, benefits from the dam's presence for fire protection and livestock purposes. As an integral part of the local water resource infrastructure, Gray Dam serves as a vital asset for the community's water management and climate resilience efforts.