Fish Lake Fish Barrier, located in Cottonwood, Minnesota, is a state-owned structure designed to prevent fish migration in the Watonwan River South Fork. It serves as a crucial tool for managing fish and wildlife populations in the area, with a primary purpose of functioning as a Fish and Wildlife Pond. The barrier is constructed of concrete, with a height of 7 feet and a storage capacity of 862 acre-feet, providing essential habitat for aquatic species.

Managed by the Minnesota Department of Natural Resources, the Fish Lake Fish Barrier is regulated, inspected, and enforced by the state agency to ensure its proper functioning and environmental impact. Despite its low hazard potential, the structure has not been rated for condition assessment, and the last inspection took place in April 2008. With a surface area of 300 acres and a drainage area of 2.3 square miles, the barrier plays a vital role in maintaining ecological balance and protecting the local aquatic ecosystem.

Fish Lake Fish Barrier is a key component of water resource management in the region, with a focus on promoting biodiversity and preserving natural habitats. As climate change continues to impact water resources, structures like this help in mitigating the effects and sustaining the delicate balance of aquatic ecosystems. With ongoing state oversight and maintenance, the barrier remains a critical asset in safeguarding the health and vitality of the Watonwan River South Fork and its surrounding environment.