Willow Lake Dam, located in Harrison County, Iowa, was completed in 1976 and is owned by the local government. The dam, designed by DESIGN ENGINEERING,INC., serves the primary purpose of debris control along the TR-WILLOW CREEK river or stream. With a height of 31 feet and a length of 390 feet, the earth dam has a storage capacity of 44 acre-feet and a surface area of 19 acres.

Managed by the Iowa Department of Natural Resources, Willow Lake Dam is regulated, inspected, and enforced by the state. The dam's hazard potential is rated as low, with a moderate risk assessment score. While the dam's condition is currently not rated, it meets the necessary guidelines for emergency action planning. The dam also provides recreational opportunities in addition to its debris control function.

Water resource and climate enthusiasts will appreciate the environmental impact and importance of Willow Lake Dam in managing water flow and debris along TR-WILLOW CREEK. As a key infrastructure in Harrison County, Iowa, the dam plays a crucial role in ensuring public safety and maintaining the ecological balance of the area. With its low hazard potential and moderate risk assessment, Willow Lake Dam stands as a testament to effective water resource management and engineering in the region.