USFS https://data-usfs.hub.arcgis.com/ USFS road data https://data-usfs.hub.arcgis.com/datasets/usfs::motor-vehicle-use-map-roads-feature-layer/explore?location=42.485414%2C-113.359700%2C4.24

BLM https://gbp-blm-egis.hub.arcgis.com/ BLM Road Data. incomplete though https://gbp-blm-egis.hub.arcgis.com/datasets/BLM-EGIS::blm-natl-gtlf-limited-public-motorized-roads