Jett Subwatershed Site M-4, located in Woodbury County, Iowa, is a crucial water resource managed by the local government for multiple purposes, including fire protection, stock, small fish pond management, and flood risk reduction. This earth dam, completed in 1966 by the USDA NRCS, stands at a height of 41 feet with a storage capacity of 136 acre-feet. With a surface area of 6.1 acres and a drainage area of 1.19 square miles, this structure plays a vital role in water management in the region.

Despite being classified as having a low hazard potential, the site's risk assessment is rated as moderate, highlighting the importance of ongoing monitoring and management. The dam is under state regulation and inspection, with the Iowa DNR overseeing permitting and enforcement. While the condition assessment is currently not rated, the structure's design and construction by the Natural Resources Conservation Service ensure its reliability in managing water flow and mitigating flood risks in the area.

With the potential to impact the surrounding TR-Wolf Creek and the local community in Turin, Jett Subwatershed Site M-4 serves as a critical infrastructure for water resource and climate enthusiasts. Its strategic location and purposeful design make it a key player in maintaining water security and protecting against potential hazards, emphasizing the importance of responsible stewardship and proactive risk management in safeguarding our environment.