Tenhulzen Dam, located in Denison, Iowa, serves multiple purposes including fire protection and providing a small fish pond for local residents. Built in 1991, this earth dam stands at a height of 20 feet and stretches across 350 feet, with a storage capacity of 50 acre-feet and a surface area of 3.9 acres. The dam is state-regulated by the Iowa Department of Natural Resources and is inspected regularly to ensure its safe operation.

Despite being classified as low hazard potential, Tenhulzen Dam is considered to have a moderate risk level due to its location on the TR-East Boyer River. The dam features an uncontrolled spillway and is primarily designed for fire protection and agricultural use. The surrounding area benefits from the dam's water storage capabilities, which contribute to the local ecosystem and provide recreational opportunities. With its strategic location and multi-purpose functionality, Tenhulzen Dam stands as a vital infrastructure asset in the region, ensuring water resource management and climate resilience for the community.