Willow Creek Subwatershed Site M-3 is a local government-owned dam located in Woodbury County, Iowa, along the TR-WOLF CREEK. Built in 1968 by USDA NRCS, this Earth-type dam stands at a height of 30 feet and spans 816 feet in length, with a storage capacity of 39 acre-feet. The primary purpose of this dam is to provide fire protection, stock water, and support small fish ponds, while also serving as a flood risk reduction measure for the surrounding area.

With a low hazard potential and a moderate risk assessment score of 3, Willow Creek Subwatershed Site M-3 is regulated and permitted by the Iowa Department of Natural Resources. Despite not having a current condition assessment, this dam has not been rated for its condition. The dam's spillway type is uncontrolled, and it does not feature any outlet gates or associated structures. While the dam does not currently have an Emergency Action Plan (EAP) in place, it meets regulatory guidelines and is inspected, enforced, and permitted by state agencies.

Water resource and climate enthusiasts will find Willow Creek Subwatershed Site M-3 to be an important infrastructure for managing water resources in the area, providing essential services for fire protection, livestock, and flood control. As a part of the local government's efforts to safeguard the community from potential hazards, this dam plays a crucial role in mitigating risks and ensuring the resilience of the surrounding ecosystem. With its longstanding history and purposeful design, this dam represents a key component of the region's water management infrastructure.