Summary:
Zip code 57018 has one high school, Tri-Valley High School - 01, serving grades 9–12 with 297 students. With no other high school in the list, families cannot compare local schools against one another. The clearest concern in the reported results is mathematics: in 2025–2026, 20% of 11th graders were proficient, compared with 34% statewide, a 14-point gap.
Tri-Valley is the area’s only school, so there is no local top or bottom school; its results are best understood against state figures. Graduation is a strong point: its 2025–2026 rate was 99%, versus 88% statewide, an 11-point advantage. The dropout rate was 1%, 1 point below the state’s 2%. On the latest assessment, English language arts was closer to the state rate, at 45% versus 48% (3 points lower), while science was above it, at 47% versus 45% (2 points higher). Together, these results show a substantial mathematics concern alongside favorable completion rates and stronger science performance.
The score pattern differed across the two reported years: in 2024–2025, Tri-Valley was below the state in all three subjects—by 3 points in English language arts, 2 in mathematics, and 4 in science—while its latest science result was above the state; these results do not establish a direct score trend. SchoolDigger’s relative ranking also moved downward, from the 67th percentile (47 of 141 schools) in 2023–2024 to the 47th percentile (88 of 166) in 2024–2025 and the 31st percentile (90 of 130) in 2025–2026, a 36-point percentile decline. For context, the 2024–2025 student–teacher ratio was 15.2, and 15% of students were free/reduced lunch eligible that school year; these are observations about the school, not explanations for its results.
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