Green Valley Lake Dam, located in Union County, Iowa, was completed in 1953 and serves primarily for recreational purposes. Managed by the Iowa Department of Natural Resources, this earth dam stands at a height of 41 feet and spans a length of 1020 feet. The dam has a storage capacity of 6830 acre-feet and covers a surface area of 336 acres along the Platte River.

Despite being classified as having a significant hazard potential, the dam's condition is assessed as fair as of June 2016. With a moderate risk rating, the dam is inspected every five years to ensure its structural integrity and adherence to safety guidelines. The dam does not have an Emergency Action Plan in place, highlighting a potential area for improvement in risk management measures to enhance public safety and emergency preparedness in case of a dam failure event.

Green Valley Lake Dam presents an important water resource for the surrounding community and offers recreational opportunities for visitors. As climate change continues to impact water availability and quality, the maintenance and monitoring of dams like Green Valley Lake are crucial in ensuring the resilience of water infrastructure and the protection of downstream areas from potential flood risks.