Otter Lake in Chippewa, Wisconsin, is a picturesque reservoir on Otter Creek, boasting a surface area of 673 acres and a maximum storage capacity of 15,000 acre-feet. Constructed in 1964 primarily for recreation, this earth dam stands at 25 feet high and spans 1200 feet. Managed by the Wisconsin Department of Natural Resources, Otter Lake is regulated, inspected, and enforced by state authorities to ensure its safety and functionality.

With a low hazard potential and a satisfactory condition assessment, Otter Lake offers a safe and enjoyable environment for water enthusiasts. The controlled spillway with a width of 72 feet can handle a maximum discharge of 7276 cubic feet per second, mitigating flood risks in the area. Despite being modified in 1969, 1994, and 2011 for various reasons, the dam continues to serve its purpose effectively and is regularly inspected every 10 years to maintain its integrity.

Although located in a remote area with no associated city, Otter Lake remains a popular destination for outdoor activities such as fishing, boating, and camping. The reservoir's risk assessment indicates a very high risk level, prompting the implementation of stringent risk management measures to ensure the safety of the surrounding community. Overall, Otter Lake is a valuable water resource in Wisconsin, offering both recreational opportunities and important water management functions in the region.