Garst Supply Dam, located in Coon Rapids, Iowa, is a privately owned earth dam completed in 1995 by the USDA NRCS. This multipurpose dam serves primarily for fire protection, stock, or as a small fish pond. With a dam height of 32 feet and a length of 398 feet, it has a storage capacity of 24 acre-feet and a surface area of 1.5 acres. The dam is regulated by the Iowa DNR and is considered to have a low hazard potential.

Situated on the TR- Middle Raccoon River, Garst Supply Dam plays a crucial role in managing water resources in the area. Despite being uncontrolled, the dam's spillway type ensures the safety of the structure. With a moderate risk assessment rating, the dam is subject to state inspections, maintenance, and enforcement. Its strategic location in a drainage area of 0.13 square miles highlights its importance in flood control and water conservation efforts in the region.

Overall, Garst Supply Dam stands as a vital asset for fire protection, livestock, and environmental conservation in Carroll County, Iowa. Its construction and management by the Natural Resources Conservation Service exemplify a commitment to sustainable water resource management and climate resilience in the area. By serving multiple purposes and meeting regulatory standards, the dam underscores the importance of proactive infrastructure measures in safeguarding communities and ecosystems against water-related risks.