Located in Chippewa, Wisconsin, O'Neil Flowage 2 is a fish and wildlife pond that serves as a vital resource for the local ecosystem. Built in 1965, this earth dam structure stands at a height of 9.1 feet and has a storage capacity of 630 acre-feet. With a normal storage of 135 acre-feet and a surface area of 91 acres, the flowage plays a crucial role in maintaining the water levels and supporting the diverse wildlife in the area.

Managed by the Wisconsin Department of Natural Resources (WIDNR), O'Neil Flowage 2 is regulated, permitted, inspected, and enforced by the state to ensure its safety and functionality. Despite being classified as having a low hazard potential, the condition assessment in 2018 rated it as fair. However, the risk assessment indicates a very high risk level, underscoring the importance of effective risk management measures and emergency preparedness.

O'Neil Flowage 2 is not just a dam structure; it is a key component of the water resource management in the region. As a hub of biodiversity and a source of water for various wildlife species, maintaining the integrity and safety of this flowage is crucial for preserving the delicate balance of the local ecosystem and ensuring a sustainable environment for generations to come.