I personally don't think you'll have much of a problem, but ask me again after our midweek "storm session". You can always try here:

Caltrans

Highway 41 should be the one you're looking for, and they have a number specifically for Yosemite info:

[YOSEMITE NAT'L PARK]
FOR YOSEMITE NAT'L PARK ROAD INFORMATION CALL 209-372-0200

MV