The eleventh annual report on the flow of students from high school to higher education in California is presented, showing that 56.2% of California's 1986-87 high school graduates aged 19 and under enrolled in its institutions of higher education in fall 1987. The number of high school graduates increased about 6% in 1986-87, which was accompanied by an increase in the number of new freshmen at the University of California (UC), California State University (CSU), and California independent colleges and universities, but not at the California community colleges. The UC participation rate decreased to 7.7% from 7.9% after having increased steadily over 10 years; CSU rose from 10.2% to 10.7%, the highest in the past 14 years; the community colleges dropped from 36.3% to 34.4%, possibly as a result of improved reporting; and the rate for California's independent colleges and universities remained at 3.4% for the 47 institutions reporting. The proportions for Asian, Filipino, and Hispanic students were slightly larger in fall 1987 ethnic distribution than in fall 1986, while proportions for American Indian, Black, and White students were all smaller. Black and Hispanic youth continue to be seriously underenrolled in higher education. Appended are tables showing: (1) percentages of recent high school graduates enrolling in each segment of California higher education by county and year (1976, 1978, and 1980-87), and (2) ethnic distribution of 1986-87 graduates of public California high schools by county and of fall 1987 first time freshmen at California institutions of higher education by county and sex. Contains 12 references. (SM)