Summary:
Riverdale CUSD 100 has one high school: Riverdale Senior High School, which serves grades 9–12 and enrolls 324 students. Its 2025–26 graduation rate was 96%, 6 points above the state rate and equal to the district rate. Chronic absenteeism was 20%—3 points below the state, but 7 points above the district. Most importantly, grade 11 ACT proficiency was above the state in all three subjects: 62% versus 50% in English language arts (ELA), 51% versus 40% in mathematics, and 49% versus 48% in science.
There is no separate top or bottom school to compare in this one-school list, but results differ notably by grade. In 2025–26, grade 9 PreACT Secure results were above the state in ELA (69% versus 62%), mathematics (49% versus 42%), and science (58% versus 47%). Grade 10 results were below the state in ELA (44% versus 54%) and science (41% versus 48%), while mathematics was just above it (38% versus 36%). The strongest grade 9 advantage was in science, at 11 points; the largest grade 10 shortfall was in ELA, at 9 points.
Recent changes reinforce that uneven picture: grade 9 scores rose by 6 points in ELA, 10 in mathematics, and 17 in science from 2024–25 to 2025–26, while grade 10 scores fell by 16 points in ELA, 1 in mathematics, and 7 in science. Grade 11 ACT scores also declined—by 7 points in ELA, 5 in mathematics, and 12 in science—though they remained above state results in every subject. As context, the school’s 2024–25 student–teacher ratio was 11.8:1, and 16% of students were free/reduced lunch eligible that year; these figures describe the school but do not explain its results.
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