Yoncalla High SchoolYoncalla High School is a public high school in Yoncalla, Oregon, United States.WWW yoncalla.k12.or.us/High%2...AcademicsIn 2008, 79% of the school's seniors received a high school diploma. Of 33 students, 26 graduated, four dropped out, one received a modified diploma, and two were still in high school the following year.