Summary:
The River Islands High District high-school list contains one school, River Islands High, serving grades 9–12 with 512 students. Its 2025–2026 completion results are strong: graduation was 100%, compared with 88% statewide, and dropout was 0%, compared with 8% statewide. Academic results are more mixed: all-grades proficiency was 30% in math and 19% in science, versus 38% and 36% statewide. The most important academic concern is science, where proficiency was 17 points below the state.
River Islands High is the only school listed, so there is no meaningful comparison of which local school performs best or worst. Its strongest subject relative to the state is all-grades English Language Arts/Literacy: 56% proficient versus 49% statewide, a 7-point advantage. That advantage does not hold for 11th grade: ELA proficiency was 56% at the school and 57% statewide. In 11th-grade math, the school was at 30% versus 32% statewide; in science, it was at 19% versus 38%, a 19-point gap. Chronic absenteeism was also lower than the state figure, at 15% versus 18%.
Science results declined while the state’s improved: all-grades proficiency at River Islands High fell from 24% in 2024–2025 to 19% in 2025–2026, while the state rose from 33% to 36%; the gap widened by 7 points. SchoolDigger’s school ranking moved down from rank 802 of 2,162, percentile 63, to rank 1,039 of 2,137, percentile 51. For context, the school had a student-teacher ratio of 18.5 in 2024–2025 and 38% free/reduced lunch eligible that year; California also provides statewide free school meals. Because this is the only school listed, these figures cannot show how it compares with similar schools nearby.
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