Nilan Dam, located in Pottawattamie, Iowa, is a privately owned structure with a primary purpose of fire protection and serving as a stock or small fish pond. Built in 1962, this earth dam stands at a height of 30 feet and spans 498 feet in length, creating a storage capacity of 45 acre-feet. The dam is regulated by the Iowa Department of Natural Resources and is inspected regularly to ensure its safety and compliance with state regulations.

Situated on the TR-WEST NISHNABOTA RIVER, Nilan Dam serves as a vital water resource for the surrounding area, with a normal storage capacity of 19 acre-feet and a surface area of 1.7 acres. Despite its low hazard potential, the dam is classified as having a moderate risk level. The structure does not have outlet gates or a spillway width, indicating a reliance on natural drainage mechanisms. While the dam's condition assessment is currently listed as "Not Rated," ongoing risk management measures are in place to address any potential issues that may arise.

Overall, Nilan Dam plays a crucial role in the local ecosystem, providing essential water storage for fire protection and livestock use. As a privately owned structure, it is subject to state oversight and regular inspections to ensure public safety and environmental compliance. With its long history of service since the 1960s, the dam continues to be a valuable asset for water resource management in the region, supporting both human and wildlife needs in a sustainable manner.