Big Coon Subwatershed Site 3-3, located in Anthon, Iowa, is a dam site managed by the USDA NRCS with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction. This earth dam, completed in 1999, stands at a height of 41 feet and spans 439 feet in length, with a storage capacity of 73 acre-feet. The dam is regulated by the Iowa DNR and is subject to state inspection, permitting, and enforcement.

With a low hazard potential and a moderate risk assessment rating, Big Coon Subwatershed Site 3-3 plays a crucial role in managing water resources in the area. The dam site is situated along the TR-Big Creek river or stream and covers a surface area of 5.1 acres, serving a drainage area of 0.34 square miles. Despite not having a spillway structure, the dam's uncontrolled spillway type allows for safe water release in times of excess flow. The site's condition is currently not rated, but it meets state regulatory standards for operation and maintenance.

Overall, Big Coon Subwatershed Site 3-3 is a vital infrastructure asset for water resource management, providing essential services for fire protection, agricultural stock, and flood risk reduction. With its strategic location and design, this dam site plays a significant role in safeguarding the local community and environment from potential water-related hazards. Climate and water resource enthusiasts will appreciate the site's importance in maintaining a balanced ecosystem and mitigating risks associated with water management in the region.