Update: Friday at 6:00 A.M.
CalTrans:

Highway 140: No Chain Controls 

Highway 41: CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW TIRES ON ALL 4 WHEELS FROM 3 MI NORTH OF OAKHURST (MADERA CO) TO 0.5 MI SOUTH OF YOSEMITE NATIONAL PARK (MARIPOSA CO

Click Here for Currrent Caltrans Road Conditions

January 16, 2020 - In the Central California area: Chains or snow tires are required from 3.3 miles West of the junction of SR 49 /at East Whitlock Rd./ to Midpines in Mariposa County.  

Chains are also required on all vehicles except 4-wheel-drive vehicles with snow tires on all 4 wheels from 6.5 miles North of Oakhurst in Madera County to the Madera/Mariposa County line.

Please research chain control locations as Caltrans is currently working to update chain control descriptions for consistency with internet mapping, like Google Maps & MapQuest.

1-way controlled traffic at various locations from Briceburg to 3.8 miles East of Briceburg in Mariposa County from 0700 hrs. (7:00 A.M.) to 1600 hrs. (4:00 P.M.) Monday thru Friday thru 1/17/20 - due to construction.

For Yosemite National Park road information call (209) 372-0200.

Source: Caltrans