rogerdoger
WKR
Not necassarily true, if the road they are using has any type of public easment, county maintanance, or historical use it can't be closed. Below is a good read for Monatna.State and county law have zero authority on BLM and USFS.
Unfortunately, a LO can close off public access if there is another way to access the public ground, either by foot/pack animal or driving around.