Hays Dam, located in Johnson County, Iowa, is a private earth dam completed in 2002 by the NRCS with a primary purpose of fire protection and serving as a stock or small fish pond. The dam stands at a height of 22 feet and has a length of 490 feet, with a storage capacity of 104 acre-feet and a surface area of 6.8 acres. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections, with a low hazard potential and a moderate risk assessment rating.

Situated on the TR-Rapid Creek, Hays Dam plays a crucial role in water resource management in the area, providing essential fire protection and recreational opportunities for the local community. Despite its relatively low hazard potential, the dam is subject to state regulations and inspections to ensure its structural integrity and safety. The dam is not federally owned or funded, but it is maintained and operated by the private owner with oversight from the Iowa DNR.

With its strategic location and purpose, Hays Dam contributes to the overall water infrastructure in Iowa City, serving as a reliable source for stock water and small fish ponds. The dam's design and construction by the NRCS reflect a commitment to sustainable water resource management and environmental conservation. As climate change continues to impact water availability and quality, Hays Dam stands as a testament to the importance of sound dam infrastructure for both ecological and human needs in the region.