Upper Green Lake in Wisconsin is a gravity dam completed in 1869 with a primary purpose of recreation. Located in Green Lake County, this dam on the Puchyan River has a structural height of 8 feet and a storage capacity of 40,000 acre-feet. The dam is regulated by the Wisconsin Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality.

With a surface area of 7346 acres and a drainage area of 115 square miles, Upper Green Lake provides both recreational opportunities and important water resource management for the region. The dam has a high hazard potential but is currently assessed to be in fair condition, with a moderate risk level. Emergency action plans are in place, and the dam is inspected every two years to maintain its integrity and safety.

Upper Green Lake is a vital water resource for the community, offering a picturesque setting for recreation while also serving as a key component of water management in the area. With its rich history dating back to the 19th century, this dam continues to play a crucial role in protecting and regulating water flow in Green Lake County. For water resource and climate enthusiasts, Upper Green Lake represents a blend of history, functionality, and environmental stewardship in one captivating location.