Jennings Lake in Decatur, Kansas, is a picturesque reservoir with a primary purpose of recreation. Built in 1937, this earth dam stands at 27 feet tall and spans 590 feet in length, providing a storage capacity of 2,227 acre-feet. With a surface area of 161 acres and a normal storage capacity of 807 acre-feet, Jennings Lake offers opportunities for fishing, boating, and other outdoor activities for water resource and climate enthusiasts to enjoy.

Managed by the local government and regulated by the Kansas Department of Agriculture, the dam at Jennings Lake boasts a controlled spillway with a width of 440 feet. The risk assessment for this structure is categorized as very high, indicating the potential for significant hazards. Though the condition assessment is currently not rated, the reservoir's undetermined hazard potential calls for ongoing monitoring and management to ensure the safety and sustainability of this vital water resource in Kansas.

Located within the Omaha District, Jennings Lake is a vital water resource in the region, offering not only recreational opportunities but also serving as a key element in the local water management system. With its historical significance dating back to the 1930s, this reservoir continues to play a crucial role in water supply and climate resilience efforts in Decatur County. As climate change impacts water resources, Jennings Lake stands as a testament to the importance of sustainable water management practices in the face of evolving environmental challenges.