In Northern California
Chains are required on single axle drive vehicles towing trailers from Viola to 8 mi west of Old Station (Shasta Co) Eskimo Hill
Chains are required on single axle drive vehicles towing trailers from 8.4 mi west of Bogard Ranger Station to Bogard Ranger Station (Lassen Co)
Chains are required on all vehicles except 4-wheel-drive vehicles with snow tires on all 4 wheels from Bogard Ranger Station to the Jct of SR 36 (Lassen Co)
Please research chain control locations as Caltrans is currently working to update chain control descriptions for consistency with internet mapping, like Google Maps & Mapquest