Summary:
ZIP code 98564 covers the small rural community of Mossyrock, Washington, and contains just two high schools — Mossyrock Junior/Senior High School with 281 students and Mossyrock Academy with 16 students — both serving grades 7–12 under the same Mossyrock School District and both carrying the district's 2-star rating.
Mossyrock Junior/Senior High School is the larger, comprehensive campus and the one with meaningful data. Its students read at roughly the state average — 51.94% proficient in English language arts versus 52.81% statewide — and the school outperforms its own district in both ELA and science. Math is the clear weak spot: only 21.71% of students are proficient, against 43.11% across Washington. That gap of more than 20 points appears in every grade tested and in both years of data. On the plus side, the school's graduation rate is 91.0%, well above the state's 82.6%, and science is the most improved subject, up 3.27 points year over year.
Mossyrock Academy looks very different. With only 16 students, it serves a much higher-poverty group: 87.5% qualify for free or reduced-price lunch, compared with 61.92% at the main campus. Its 2025-2026 test results are suppressed by the state because the group is too small to report safely, and its only outcome figures date back about a decade, so its academic performance cannot be judged from this data at all. Parents should also treat the reported per-student spending figures ($18,961 versus $4,580) with caution, since they likely reflect accounting differences rather than a genuine fourfold resource gap. Meanwhile, the main school's ranking has slipped from the 43rd to the 32nd percentile over three years even as scores held steady, suggesting other schools improved faster.
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