Lanning Dam, located in Dallas County, Iowa, is a privately owned earth dam completed in 1988 for fire protection, stock, and small fish pond purposes. The dam stands at a height of 29 feet and has a length of 190 feet, with a storage capacity of 39 acre-feet. Situated on the TR-Raccoon River, the dam is regulated by the Iowa Department of Natural Resources and is inspected and permitted by state authorities.

With a low hazard potential and a moderate risk assessment rating, Lanning Dam plays a crucial role in water resource management in the area. Despite its small surface area of 3 acres, the dam serves as a key water source for fire protection and livestock watering. As a part of the Rock Island District, the dam is not under the jurisdiction of the US Army Corps of Engineers, but it remains a vital infrastructure for the surrounding community.

Lanning Dam's design by the Soil Conservation Service ensures its structural integrity and functionality for its intended purposes. While the dam has not been rated for its condition assessment, its location in Adel, Iowa, and its proximity to the Raccoon River highlight its importance in water conservation efforts. As climate change continues to impact water resources, Lanning Dam stands as a testament to the essential role of such structures in safeguarding against water scarcity and ensuring sustainable water management practices.