Jett Subwatershed Site M-5 is a local government-owned water resource infrastructure located in Woodbury County, Iowa. This site, managed by the USDA NRCS, serves multiple purposes including fire protection, stock watering, and flood risk reduction. The earth dam, completed in 1966, stands at 43 feet high and spans 791 feet in length, providing a storage capacity of 195 acre-feet and covering an area of 8.1 acres.

Despite its low hazard potential, Jett Subwatershed Site M-5 is regulated by the Iowa DNR and undergoes state permitting, inspection, and enforcement to ensure its structural integrity and operational safety. The site's risk assessment is rated as moderate, and it has not been formally rated for its condition assessment. While there is no Emergency Action Plan (EAP) currently in place, the site meets guidelines for risk management measures and has not experienced any major modifications or incidents since its completion.

Situated along the TR-Wolf Creek, Jett Subwatershed Site M-5 plays a critical role in managing water resources in the region. With its focus on fire protection, livestock watering, and flood risk reduction, this site exemplifies the importance of sustainable water infrastructure for both environmental and community resilience in Iowa.