From Caltrans:
CHAINS OR SNOW TIRES ARE REQUIRED FROM 3.5 MI EAST OF MURPHYS TO
7.5 MI EAST OF MURPHYS (CALAVERAS CO)
CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW
TIRES ON ALL 4 WHEELS FROM 7.5 MI EAST OF MURPHYS TO THE MT REBA TURNOFF
(ALPINE CO)