Here is a handy table of 2015 UC frosh admission rates by HS GPA:
Campus 4.20- 3.80- 3.40- 3.00-
higher 4.19 3.79 3.39
UCB 46% 12% 2% 1%
UCLA 53% 14% 3% 1%
UCSD 88% 39% 6% 1%
UCSB 88% 49% 13% 2%
UCD 89% 53% 11% 3%
UCI 97% 56% 16% 4%
UCSC 95% 83% 47% 10%
UCR 99% 90% 64% 25%
UCM 98% 92% 80% 42%
Note: 3.00 is the usual minimum HS GPA for California residents; 3.40 is the usual minimum high school GPA for non-California residents.