Lake Mohawksin is the name of the reservoir on the Wisconsin River formed by the Tomahawk Dam. The dam is located about one mile south of the city limits of Tomahawk, Wisconsin. Lake Mohawksin was originally called Lake Tomahawk, but the name was changed to avoid confusion with the town of Lake Tomahawk as well as the lake near that town (which is actually called Tomahawk Lake). The name Mohawksin is derived from a concatenation of the last syllables of the three rivers which flow into it – the Somo, the Tomahawk and the Wisconsin. The name came via a contest won by Herbert Atcherson in 1926.