Hanlontown Slough Dam 1.1, located in Worth County, Iowa, is a Federal-owned structure designed by NRCS for the primary purpose of serving as a Fish and Wildlife Pond. Completed in 2001, this Earth-type dam stands at a height of 11 feet and spans a length of 938 feet, with a storage capacity of 191 acre-feet. The dam is situated on TR- Willow Creek and is regulated by the Iowa Department of Natural Resources, with state permitting, inspection, and enforcement in place.

With a low hazard potential and a moderate risk assessment rating, Hanlontown Slough Dam 1.1 plays a crucial role in managing water resources and supporting wildlife in the area. The dam's surface area of 14 acres and drainage area of 0.75 square miles contribute to its function as a habitat for fish and wildlife. Despite being in a moderate-risk category, the dam's condition assessment is currently not rated, highlighting the need for ongoing monitoring and maintenance to ensure its continued safety and effectiveness.

As a key feature in the St. Paul District managed by the US Army Corps of Engineers, Hanlontown Slough Dam 1.1 serves as a vital component in the local ecosystem, providing valuable benefits for both wildlife and the surrounding community. Its presence along TR- Willow Creek underscores its significance in water resource management and conservation efforts, making it a focal point for water resource and climate enthusiasts interested in sustainable infrastructure and environmental stewardship.