Derby Dam in Iowa, also known as the Soap Creek Reservoir, serves multiple purposes including fire protection, livestock watering, and supporting small fish populations. Constructed in 2001 by the NRCS, this earth dam stands at a height of 26 feet and spans 458 feet in length, with a storage capacity of 120 acre-feet. Located in Eldon, Iowa, along the TR-Soap Creek, this dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality.

Despite being classified as low hazard potential, Derby Dam poses a moderate risk due to its age and lack of a recent condition assessment. The spillway, with a width of 2 feet, is uncontrolled, and the dam is designed to handle a drainage area of 0.5 square miles. The surrounding area covers 5.9 acres, providing essential water resources while also posing a potential risk to downstream communities in the event of a breach. With no emergency action plan in place, the management of this dam should be closely monitored to mitigate any potential risks to the environment and public safety.

Owned by the local government, Derby Dam in Iowa represents a key water resource management structure in the state. With a primary focus on serving local agricultural and ecological needs, this dam plays a crucial role in ensuring water availability for firefighting and livestock while also supporting biodiversity in the area. Going forward, continued monitoring and maintenance of Derby Dam will be essential to uphold its integrity and safeguard the surrounding communities and ecosystems from any potential threats or hazards.