Heisler Subwatershed Site 2-1 is a flood risk reduction structure located in Woodbury, Iowa, along the TR-West Fork Little Sioux River. Built in 2004 by the USDA NRCS, this earth dam stands at 40 feet in height and spans 715 feet in length, with a storage capacity of 210 acre-feet. The primary purpose of this structure is flood risk reduction, serving as a vital defense against potential inundation in the area.

With a low hazard potential and a moderate risk assessment rating, Heisler Subwatershed Site 2-1 plays a crucial role in safeguarding the surrounding community from the impacts of flooding. While not currently rated for condition assessment, this structure is inspected by the state agency and maintained to ensure its operational integrity. Positioned in an area prone to flood events, this dam provides essential protection to residents and properties along the Missouri River.

Despite its uncontrolled spillway type, Heisler Subwatershed Site 2-1 effectively manages floodwaters and helps mitigate the risk of potential disasters. As a significant asset in the region's water resource management infrastructure, this structure highlights the importance of proactive measures in addressing climate-related challenges and ensuring the resilience of communities in the face of changing environmental conditions.