Summary
Delta High is a small high school in Clarksburg, California, serving grades 10–12 with 196 students. Its latest completion and attendance figures are strong: in 2025–26, 100% of students graduated, the dropout rate was 0%, and chronic absenteeism was 9%, compared with 18% statewide and 20% in the district. The clearest academic concern is math, where only 14% of students were proficient.
Results differ sharply by subject. In 2025–26, 56% were proficient in English language arts (ELA)—7 percentage points above the state and 19 above River Delta Joint Unified; Delta also scored 14 points above the nearby-school average of 42%. Math proficiency was 14%, 25 points below the state, 7 below the district, and 10 below the nearby-school average of 23%. Science was closer to the state: 34% proficient, compared with 36% statewide and 25% in the district. Delta was 6 points above the nearby-school science average of 28%, making science a relative strength locally despite its small state gap.
Scores rebounded from 2024–25 to 2025–26, especially in ELA, which rose 21 percentage points, and science, up 17 points; math increased 4 points. The longer-term picture is uneven: math improved 9 points from 2022–23 but remains far below the state. SchoolDigger gives Delta 2 stars and ranks it at the 50th percentile statewide, near the middle of nearby schools. Its 2024–25 student-teacher ratio was 15.7, the second-lowest among the listed nearby schools, and 75% of students were free/reduced lunch eligible that year. SchoolDigger’s subgroup rankings also vary notably: the school ranked at the 13th percentile for effectiveness with migrant students in 2025–26, versus the 50th percentile overall; its Hispanic-student ranking rose from the 20th percentile in 2024–25 to the 54th in 2025–26.
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