Summary:
Zip code 83214 in Arimo, Idaho, contains just 2 schools—Marsh Valley High School (grades 9–12, 303 students) and Marsh Valley Middle School (grades 7–8, 166 students)—both part of the highly rated Marsh Valley Joint District, which ranks in the 75th percentile of Idaho districts despite the individual schools earning below-average star ratings.
For parents, the most important differences come down to level and momentum. The high school is the larger school and shows clear signs of improvement, jumping from a 1-star to a 2-star ranking in one year and seeing math proficiency more than double from 19.4% to 40.4%. Its End-of-Course math score (40%) is above the state average (33.1%), and its graduation rate (82.5%) matches the state. However, chronic absenteeism is elevated at 19.3% vs. the state's 13.8%. The middle school, meanwhile, has a stark grade-level split: 7th graders exceed state averages in ELA and math, but 8th graders are far behind in math (24.7% vs. 41.4%), science (24.7% vs. 43.4%), and ELA (41.6% vs. 55.5%). The middle school also serves a higher share of economically disadvantaged students (30.1% free/reduced lunch vs. 22.1% at the high school), yet per-student spending reported in 2018–2019 was lower ($6,150 vs. $8,519)—though these figures are several years old.
Overall, both schools share a challenge: small enrollments mean year-to-year swings can be exaggerated, so rankings and proficiency jumps should be interpreted cautiously. The clearest action areas for the area are 8th-grade academic support and high-school attendance. The high school's recent progress is encouraging, and 7th-grade performance at the middle school is a genuine strength. Parents comparing the two will find a district that is respected broadly but schools that are still working to match that reputation across all grades and subjects.
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