Decorah Lower Milldam, located in Iowa's Winneshiek County along the Upper Iowa River, was completed in 1973 and serves as a popular recreational spot for water resource and climate enthusiasts. This gravity dam stands at a height of 27 feet and spans 500 feet, with a storage capacity of 1,318 acre-feet and a normal storage level of 1,091 acre-feet. The dam's surface area covers 80 acres, providing a picturesque setting for outdoor activities like fishing, boating, and birdwatching.

Managed by the Iowa Department of Natural Resources, Decorah Lower Milldam is regulated and inspected by the state to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment rating, the dam poses minimal risk to the surrounding community. Although its condition is currently not rated, the dam's recreational value and contribution to the local ecosystem make it a key feature in the region's water resource management efforts.

Decorah Lower Milldam's presence along the Upper Iowa River not only enhances the area's natural beauty but also provides valuable recreational opportunities for residents and visitors alike. As a gravity dam with a focus on recreation, this structure showcases the importance of sustainable water resource development and management in a changing climate. With its low hazard potential and moderate risk assessment, the dam continues to serve as a safe and enjoyable destination for outdoor enthusiasts seeking to connect with nature and explore the diverse ecosystem of the region.