Lake Rousseau is a reservoir on the Withlacoochee River in central Florida, on the boundary of Levy County to the north-west, Marion County to the north-east, and Citrus County to the south. It was created in the early 1900s when the river was dammed. Florida Power Corp operated a hydroelectric plant from 1909 to 1965 at the western end of the lake. …Lake Rousseau is a reservoir on the Withlacoochee River in central Florida, on the boundary of Levy County to the north-west, Marion County to the north-east, and Citrus County to the south. It was created in the early 1900s when the river was dammed. Florida Power Corp operated a hydroelectric plant from 1909 to 1965 at the western end of the lake. Power output was approximately 10,000 HP, or 7.45 MW.