Can't speak to those or any forest in MT, but in general, each National Forest has a MVUM - a map that shows areas open to motorized (highway) vehicles and off-road (non highway). It also shows official dispersed camp sites (numbered that is), and forest service campgrounds that might not show up on any other maps.
Check out the USDA / USFS website for your forest and grab a copy of the map. Also the print version is free if you stop in to the ranger's office.
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