Dettmer Dam, located in Lee County, Iowa, was completed in 1974 by the USDA NRCS and is privately owned. This earth dam serves multiple purposes, including fire protection and creating a small fish pond. With a height of 26 feet and a length of 215 feet, the dam has a storage capacity of 74 acre-feet and covers a surface area of 4 acres. It is regulated by the Iowa Department of Natural Resources and is inspected and permitted by state authorities.

The dam is situated on the DES MOINES RIVER, specifically on TR-GRAPE CREEK, and is designed to have uncontrolled spillways. Despite its low hazard potential and moderate risk assessment, the dam's condition is currently not rated, and it lacks a detailed emergency action plan. The dam's location in a rural area with limited drainage area highlights its importance for local water resource management and climate resiliency efforts. Overall, Dettmer Dam stands as a significant structure contributing to water supply and ecosystem maintenance in the region.

For water resource and climate enthusiasts, Dettmer Dam represents a unique case study in private dam ownership and state regulation. Its design by the NRCS and management by the Iowa DNR showcase the collaboration between federal and state agencies in ensuring the safety and functionality of key water infrastructure. As climate change impacts continue to affect water availability and quality, dams like Dettmer play a crucial role in mitigating risks and providing essential services to local communities. The future maintenance and monitoring of Dettmer Dam will be essential in safeguarding its functionality and resilience in the face of evolving climate conditions.