The Creston Flood Prevention Dam, located in Creston, Iowa, was completed in 1975 with the primary purpose of flood risk reduction along Hurley Creek. The dam, designed by the USDA NRCS, is owned by the local government and regulated by the Iowa DNR. With a height of 27 feet and a length of 830 feet, the dam has a storage capacity of 556 acre-feet and covers a surface area of 16.1 acres.

The dam's spillway type is uncontrolled, with a width of 3 feet, and it has been assessed to have a high hazard potential but is currently in satisfactory condition. The dam is inspected every two years, with the last assessment taking place in July 2019. The risk assessment for the dam is moderate, with a rating of 3 out of 5, indicating a need for ongoing monitoring and risk management measures to ensure the safety and efficacy of the structure in preventing flooding in the area.

Overall, the Creston Flood Prevention Dam plays a crucial role in mitigating flood risks in Union County, Iowa, by regulating water flow along Hurley Creek. With its earth construction and soil foundation, the dam serves as a vital infrastructure for flood protection and also offers recreational opportunities for the community. As climate change continues to impact water resources, the ongoing maintenance and monitoring of the dam are essential to ensure its continued effectiveness in protecting the surrounding area from potential flooding events.