Tomah Lake, located in Monroe County, Wisconsin, is a man-made reservoir on the Lemonweir River with a high hazard potential due to its 16-foot earth dam. The dam, completed in 1936, has a storage capacity of 2,250 acre-feet and serves multiple purposes, including flood control and water supply. The lake covers an area of 225 acres and has a normal storage capacity of 980 acre-feet, making it an important resource for the local community.

Despite its age, Tomah Lake is well-maintained and regularly inspected by the Wisconsin Department of Natural Resources to ensure its structural integrity and safety. The dam has been modified in 1937 and 1991 for improvements, and it features a controlled spillway with a width of 42 feet. The risk assessment for the dam is classified as very high, highlighting the importance of ongoing risk management measures to mitigate potential hazards and protect the surrounding area from flooding. With its picturesque location and vital role in water resource management, Tomah Lake is a significant asset for both the environment and the community.