Named after a unique natural feature, Nine-Mile Swamp, the forest has 4,897 acres of mixed uplands, marshes, and water impoundments available to the public for a variety of activities. This is the crown jewel of our county forest system. Nine Mile is intensively managed for multiple uses including sustainable timber harvests, mountain biking, winter fat tire biking, cross-country skiing, horseback riding, hiking, snowmobiling, and snowshoeing.

This unit is located just southwest of Wausau with access off of Co. Hwy. KK, Springbrook Road, Hollywood Road and Red Bud Road, which transects the forest unit.  There is a large formal parking area and Chalet building at the north portion of this unit, at 221700 Red Bud Road.  The main trailhead starts here for a variety of uses.  

A well maintained system of trails totaling over 30 miles (45 Km) allow easy access for recreation.  All trails are closed to motorized vehicles, except in winter, for designated snowmobile/ATV trails.  In the summer, the ski trails become an excellent mountain biking trail system.  Horses are allowed on the snowmobile trail during the summer only.  Blackberries, blueberries, and choke cherries are eagerly sought by berry pickers in the late summer and fall.