Yeah I apparently wasn't thinking that that clearly when I did it. I agree with your assessment around foot traffic.

Yes. According to the forest service Motor Vehicle Usage Maps at: https://www.fs.usda.gov/detail/custergallatin/maps-pubs/?cid=fseprd557674

You can download the GeoPDF for the Hebgen Lake Ranger District at:
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd544202.pdf Look for road 2527 in the "Roads open to all Wheeled Vehicles" section.