Derry Dam, located in Taylor County, Iowa, is a privately owned earth dam completed in 1983 with a primary purpose of providing fire protection and serving as a stock or small fish pond. The dam stands at a height of 32 feet and has a length of 800 feet, with a storage capacity of 119 acre-feet. Despite its low hazard potential, the dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its safety and compliance with state regulations.

Situated on the TR-West Branch 102 River, Derry Dam plays a crucial role in water resource management in the area, with a drainage area of 0.56 square miles and a surface area of 5 acres. The dam's spillway type is uncontrolled, and it has not been modified since its completion. While the dam's condition assessment is currently not rated, it is considered to have a moderate risk level (3) based on a risk assessment. Overall, Derry Dam serves as a vital infrastructure for fire protection and water storage in the region, contributing to the local ecosystem and water supply.

With its strategic location and important functions, Derry Dam remains a key feature in the water resource infrastructure of Taylor County, Iowa. Owned privately, the dam reflects a commitment to maintaining water resources for various purposes, including fire protection and wildlife conservation. As climate change impacts water availability and quality, the role of dams like Derry Dam becomes increasingly critical in ensuring sustainable water management practices and resilience to changing environmental conditions.