Nagel Dam, located in Poweshiek County, Iowa, is a private-owned earth dam designed by ProAg Engineering for recreational purposes. Completed in 2015, the dam stands at a height of 22 feet, with a storage capacity of 73 acre-feet and a surface area of 11 acres. Situated on a tributary to Big Bear Creek, the dam serves as a popular spot for outdoor activities and water recreation in the area.

Managed by the Iowa Department of Natural Resources, Nagel Dam is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and compliance with regulations. With a low hazard potential, the dam has not been rated for its condition assessment, but it meets guidelines for emergency action plans. Despite not being under the jurisdiction of the US Army Corps of Engineers, the dam is well-maintained and monitored to prevent any potential risks to the surrounding community.

Nagel Dam plays a vital role in providing recreational opportunities for residents and visitors to Brooklyn, Iowa. With its serene location and ample storage capacity, the dam offers a picturesque setting for fishing, boating, and other water-based activities. As a privately-owned structure with state oversight, Nagel Dam stands as a testament to responsible water resource management and environmental stewardship in the region.