Hawley Dam, located in Denison, Iowa, is a privately owned structure designed by the NRCS with a primary purpose of flood risk reduction. Completed in 2009, this earth dam stands at a height of 30 feet and has a length of 405 feet, providing a storage capacity of 39 acre-feet. It serves to stabilize grades along the Trip to Rocky Run, a river or stream in Crawford County.

With a low hazard potential and a moderate risk assessment rating, Hawley Dam is regulated by the Iowa Department of Natural Resources and undergoes regular state inspections and enforcement measures. While the condition assessment of the dam is currently not rated, it meets the guidelines for emergency action plans (EAP) preparation. The dam has a spillway width of 2 feet and is equipped with uncontrolled spillway type, with no locks or outlet gates associated with it.

Water resource and climate enthusiasts can appreciate the role of Hawley Dam in mitigating flood risks and stabilizing water flow along the Trip to Rocky Run. As a vital infrastructure in Crawford County, the dam's construction and maintenance reflect a commitment to water resource management and environmental protection in the region. Its strategic design and purposeful operation contribute to the overall resilience of the local ecosystem and community against natural hazards and water-related challenges.