Olsen Dam, located in Missouri Valley, Iowa, is a privately owned structure designed by the USDA NRCS for fire protection, stock, or as a small fish pond. Completed in 1961, this earth dam stands at a height of 52 feet and has a length of 671 feet, with a storage capacity of 165 acre-feet. The primary purpose of Olsen Dam is to provide essential water resources for fire protection and to support local livestock.

Managed by the Iowa Department of Natural Resources, Olsen Dam is regulated, inspected, and enforced by state authorities to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment rating, Olsen Dam poses minimal risks to its surrounding areas. Although not currently rated for its condition, Olsen Dam continues to serve as a valuable water resource for the community, with a surface area of 9 acres and a drainage area of 0.85 square miles.

Despite its uncontrolled spillway type and lack of outlet gates, Olsen Dam remains an important asset for water management in the region. With a focus on maintaining its structural integrity and meeting regulatory guidelines, Olsen Dam stands as a testament to effective water resource management and climate adaptation efforts in Iowa.