Stateline Flowage in Douglas County, Wisconsin, is a picturesque reservoir with a primary purpose of recreation. Completed in 1970, this earth dam stands at a height of 8 feet and has a length of 1300 feet, creating a tranquil surface area of 58 acres and a maximum storage capacity of 230 acre-feet. The reservoir is fed by the West Branch Hay Creek and is under the jurisdiction of the Wisconsin Department of Natural Resources, ensuring state-regulated permitting, inspection, and enforcement.

Despite its low hazard potential, the dam's condition assessment was reported as poor in 2017, suggesting a need for maintenance and improvements. The risk assessment for Stateline Flowage is classified as very high, indicating a level 1 risk. With a history of modifications in 2018 and ongoing state oversight, the reservoir remains a popular spot for outdoor enthusiasts seeking water-based activities in the heart of Wisconsin. Whether for fishing, boating, or simply enjoying the scenic surroundings, Stateline Flowage offers a unique and valuable resource for both locals and visitors alike.