Easter Lake Stormwater Retention Basin - Site 9, located in Des Moines, Iowa, is a vital flood risk reduction infrastructure designed by Snyder and Associates. Completed in 2005, this earth dam stands at a height of 24 feet and has a length of 475 feet, providing a significant storage capacity of 168 acre-feet. With a primary purpose of flood risk reduction, this retention basin plays a crucial role in managing stormwater runoff and protecting the surrounding areas from potential flooding.

The Easter Lake Stormwater Retention Basin is state-regulated by the Iowa Department of Natural Resources, ensuring that it meets all necessary standards for inspection, enforcement, and permitting. With a high hazard potential but a satisfactory condition assessment, this structure has a moderate risk assessment level. The spillway type is uncontrolled with a width of 8 feet, allowing for the safe release of excess water during heavy rainfall events. Despite its high hazard potential, the structure's risk management measures and emergency action plan are in place to mitigate any potential risks effectively.

This retention basin, situated on Tr-Yeader Creek, serves as a crucial piece of infrastructure in flood risk management for the Polk County area. With its efficient design and satisfactory condition, the Easter Lake Stormwater Retention Basin - Site 9 stands as a testament to effective water resource management and climate resilience in the region.