Unfortunately it is the responsibility of the user to "know before you go". Granted, the USFS/BLM/USPR do not always make it easy or abundantly clear.
Under "misc maps" on the UWCNF website:
https://www.fs.usda.gov/detail/uwcnf/maps-pubs/?cid=fsem_035542
Specific map...
Gate or not, wheeled vehicles are not allowed to travel over snow on USFS roads as so designated. Farmington Canyon is open to OHV's in winter, Ward Canyon and above the B is open only to over-snow vehicles at snowline (everywhere). Diesel Brothers or any other idiots doing it, doesn't make it...
Stopped by the museum yesterday to drop off this BJ70 and took a peek at Mike Davidson's LC toy collection on display. Amazing! Looking forward to Cruiserfest!