The biggest concern likely in the state is flooding if the snow melts too fast from warm rains

 I have seen the central Valleys Sacramento Valley which in the south is called the San Joaquin Valley)

Flooded out pretty good over the years. IN fact, it was touch and go one year in the Spring trying just to drive from Yosemite national Park where we were vacationing back to the Greater SF Bay area. Road after Road was flooded after we came down out of the mountains into the big Valley that runs about 400 miles from Redding to the Tehachapi mountains in Southern California. I think we ONLY found one way out of many to even return to the SF bay area that year that time. So, we were just considering getting a hotel when we found at least one way back on a highway then to the San Francisco Area on the coast.