Ridgley Dam, located in Arion, Iowa, was completed in 1967 by the USDA NRCS and is privately owned. The dam serves multiple purposes including fire protection and as a stock or small fish pond. With a height of 30 feet and a length of 395 feet, Ridgley Dam has a storage capacity of 70 acre-feet and covers a surface area of 3 acres. It is situated on Walnut Creek in Crawford County and is regulated by the Iowa Department of Natural Resources.

Despite being classified as a low-hazard dam, Ridgley Dam is subject to moderate risk due to its condition assessment being not rated. The dam has not been inspected recently, and its emergency action plan status is unknown. While there are no outlet gates or locks associated with the dam, it has an uncontrolled spillway. Overall, Ridgley Dam plays a crucial role in water resource management in the area and serves as a vital structure in the local ecosystem.

Water resource and climate enthusiasts interested in the intricacies of dam construction and management will find Ridgley Dam to be a fascinating case study. With its unique design by the USDA NRCS, multiple purposes, and moderate risk assessment, the dam presents a blend of challenges and opportunities for sustainable water resource management. Its location on Walnut Creek adds to its significance in the region, making Ridgley Dam an essential component of the local water infrastructure.