WI I39 Janesville Rest Area - Southbound WI Interstate 39 / 90 Rest Area - Southbound Access at Mile Marker 168 This Rest Area is located near mile marker 168 on Interstate I 39. Accessible from Wisconsin Interstate 39 with Southbound access. (North of Janesville, Rock County) I-39 Rest Area Off Ramp WI I-39 Southbound Off Ramp Rest Area Weather JANESVILLE WEATHER Rest Area Driving Directions Rest Area Facilities 83 car and 78 truck parking stallsMen’s and women’s restroomsFamily/assisted restroomHandicapped accessibleDiaper changing facilitiesDrinking waterVending machinesTravel/weather infoTelephones plus TTYWooded picnic area and tablesPrairie demonstration plotPet exercise areaRecycling areas Rest Area Points of Interest Original rest area opened in 1962. New building/enlarged site opened in 1995. Old “Original” style building was located in the picnic area. Companion rest area 18 in northbound direction was closed and demolished in 1996. “Rock River Industry” Historical Marker located on site. To suggest a correction, please click here.