Hidden River Middle School

Hidden River Middle School is one of the compact junior highs in Snohomish, Washington, operated by Monroe School District, with 313 students on its rolls from grades 6 through 8. Compared to the state average of about 577 students per school, that is 46% leaner than typical.

Across the 12 schools in Monroe School District (5,874 students total), Hidden River Middle School accounts for its share of the district's footprint.

Demographically, Hidden River Middle School records that the largest single group is White, at 67% of enrollment. Beyond that, the school lists 22% Hispanic, 7% multiracial. That mix tracks the wider county fairly closely.

Looking at the economic backdrop, On paper, Hidden River Middle School has 17 full-time-equivalent teachers, translating to a class-load average of around 18.0:1. That figure is tighter than the state norm's 18.9:1 average. Roughly 35% of students at Hidden River Middle School qualify for free or reduced-price lunch, a number frequently used as a low-income enrollment indicator.

Adjusting for the school's free-and-reduced-lunch share, Hidden River Middle School performs roughly as the BeatsExpectations model predicts for a school with this FRL share. The predicted value is around 56.6%, the actual is 48.0%, a residual of -8.7 points.

Across the wider county, Snohomish County reports that the typical household earns roughly $111,246 per year, roughly 38% of adults have completed at least a four-year degree, and the poverty rate sits near 6%. In all, Snohomish County runs 227 public schools (combined enrollment of about 118,688 students), of which Hidden River Middle School is one.

Maltby Elementary is the nearest neighboring public school, about 0.4 miles from this campus. Within five miles, there are 8 other public schools. Ranking that nearby cluster on reported proficiency puts Hidden River Middle School at 8th of 8; the average score across the group is 68.1%.

Geographically, the school is in a bedroom-community area.

Looking at the recent track record. Over the past 7-year window, the student count declined 29%: 442 students in 2018 compared to 313 in 2025.

On this page, posts here usually surface around classroom updates, athletics, and weather closures. Members of the school community can share what they know.