West Fk Big Cr Watshd Site S-7 is a flood risk reduction structure located in Decatur, Iowa, along the TR- SHAIN CREEK. Owned by the local government and regulated by the Iowa DNR, this earth dam was completed in 1996 and serves the primary purpose of flood risk reduction. With a dam height of 21 feet and a length of 475 feet, it has a storage capacity of 79 acre-feet and covers a surface area of 4.1 acres, draining a 0.26 square mile drainage area.

Despite being classified with a low hazard potential and a moderate risk assessment rating of 3, the condition assessment of West Fk Big Cr Watshd Site S-7 is currently marked as "Not Rated." The structure is equipped with an uncontrolled spillway and does not have outlet gates or locks. While no recent inspection or maintenance information is available, the state of Iowa has permitting, inspection, and enforcement protocols in place. Overall, West Fk Big Cr Watshd Site S-7 stands as a critical infrastructure for managing flood risks in the region, highlighting the importance of water resource management in the face of changing climate conditions and increasing water-related challenges.