These maps are gray-scale, letter-sized printable Over-the-Snow Motor Vehicle Use Maps. These maps have a limited purpose. They show the prohibitions and open areas for use of over-snow vehicles on the Lewis and Clark National Forest pursuant to 36 CFR 212.81. They show established snowmobile routes as well as routes that are open to snowmobiles in areas closed to cross-country snowmobile travel. For detailed information about motorized routes for wheeled vehicles, see the Motor Vehicle Use Maps, which show roads to access snowmobile areas that are open to highway vehicles during certain seasons.
Please note that for the Rocky Mountains, Little Belt Mountains, Castle Mountains, Crazy Mountains, and Highwood Mountains only snowmobiles are allowed during the given winter season. No vehicles steered and driven by tracks or with bench seating (such as snow coaches, atvs and utvs with 4-track conversion kits) are allowed. Snowmobiles are defined as:
Snowmobile. An over-snow vehicle that operates on a track, uses one or more skis for steering, and has handle-bar steering and a seat designed to be straddled by the operator. (FSM 2350.05)
In the Big and Little Snowy Mountains snowmobiles as well as vehicles with snow tracks on them, such as snow coaches and utvs with conversion kits are allowed as over-snow vehicles, during the dates shown on the OSMVUM.
Please be aware that special orders may superceed certain portions of these maps, and certain conditions may warrent temporary special closures to mitigate safety or resource concerns.