Enrollment
512
California · 2024-25 NCES data
2024-25 NCES data High school (grades 9-12) NCES 060257414622 Charter school
River Islands High — Lathrop, CA
Federal NCES profile for River Islands High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators — Resource Investment Index 52/100.
👥 Class size 52
How this works: Each indicator above is scored 0–100 from federal NCES and CRDC data, then averaged into the Resource Investment Index. This measures resource allocation — staffing, programs, and support services — not standardized test scores or academic outcomes. Full methodology →
School address
District: River Islands High District · California
Public location data per NCES (National Center for Education Statistics) Common Core of Data. Verify the school's current address on the NCES CCD record.
Teachers (FTE)
9.0
Federal CCD staff survey
Students per teacher
12:1
vs 21.6:1 California avg
-44% vs state
Free-lunch eligible
33.3%
vs 55.5% California avg
-40% vs state
Student-teacher ratio in context
How River Islands High compares with California and U.S. medians
The federal record — no proprietary index, no editorial formula.
PlainSchools publishes the actual federal measurements — enrollment, staffing, demographics, discipline, and finance — straight from the NCES Common Core of Data, CRDC, and F-33 surveys. No composite rating, no opinion-based score on top. You get the same raw numbers researchers and policymakers use, with benchmarks, spending context, and equity indicators computed from the same federal datasets. Full methodology linked below.
What this school's NCES data tells you
River Islands High reports 512 enrolled students to the National Center for Education Statistics (NCES) alongside 9.0 full-time-equivalent teachers, producing a 12:1 student-teacher ratio. That figure sits 44% below the California state mean of 21.6:1, signalling more teacher attention per pupil than the state benchmark. Against the national 2024-25 average of 15.9:1, it is 25% lower, a useful calibration for families comparing districts across state lines.
Title I and federal lunch eligibility offer another window into the student body: 33.3% of pupils qualify for free meals, a proxy for household income that federal programs use to direct funding. The free-lunch share is 40% below the California average and 36% below the national baseline.
Taken together, these measurements produce a Resource Investment Index of 52/100 (C-), calculated from 1 distinct NCES and CRDC indicators measuring resource allocation rather than academic outcomes.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How River Islands High compares
Cross-validating school-level NCES values against California state and U.S. national means lets readers see whether this school is an outlier or in line with peers.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 12:1 | ▼ 44% | 21.6:1 | 15.9:1 |
| Free-lunch eligible | 33.3% | ▼ 40% | 55.5% | 51.8% |
| Enrollment | 512 | top 57% | — | — |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
What the federal data reveals about equity at this school
Federal measurements — not ratings — surface the resource and opportunity picture. Below are the indicators that researchers, civil-rights monitors, and funding formulas use to assess equity.
Economic need
33.3%
free-lunch eligible
— 40% below the California average of 55.5%
Below the 40% Title I threshold — federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
12:1
students per teacher
— 44% below state mean
Top 5% in California — lower ratio than 95% of state schools
Below the 15:1 benchmark — typical of schools with smaller class sizes and more individualized attention.
Overview
Enrollment 512 Top 57% in California — larger than 43% of 10,006 state schools
Teachers (FTE) 9.0
Students per teacher 12:1 -44% vs state
Free-lunch eligible 33.3% -40% vs state
NCES ID 060257414622
Student demographics
Asian 47.9%
Hispanic or Latino 29.9%
African American 10.9%
White 8.0%
Native Hawaiian / Pacific Islander 1.4%
American Indian / Alaska Native 1.0%
Two or More 1.0%
Largest group: Asian at 47.9% of enrollment.
Similar high schools in Lathrop
1 comparable high schools (grades 9-12) serving the same city.
Educator & family resources
In-depth guides on understanding NCES data, school choice, and education funding.
Understanding NCES data
How CCD, CRDC and EDFacts feed every public-school number you see.
Choose a school district
Eight signals that matter more than the overall ranking number.
How schools are funded
Title I, F-33, state aid formulas and what per-pupil spending really means.
Chronic absenteeism
Why missing 10% of school matters and how it varies by district.
Magnet vs charter vs traditional
Three school types, three funding models, three sets of trade-offs.
School discipline data
What CRDC suspension and expulsion records do and don't reveal.
Frequently asked questions about River Islands High
How many students attend River Islands High?
River Islands High has 512 students enrolled. It is a high school in Lathrop, CA.
What is the student-teacher ratio at River Islands High?
The student-teacher ratio at River Islands High is 12:1, which is 44% lower than the California average of 21.6:1 and 25% lower than the national average of 15.9:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at River Islands High?
33.3% of students at River Islands High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of River Islands High?
The largest demographic group at River Islands High is Asian at 47.9%. The school serves a diverse student body in Lathrop, CA.
What is the Resource Investment Index for River Islands High?
River Islands High has a Resource Investment Index of 52/100 (C-) based on 1 factor: student-teacher ratio. This index measures federal resource allocation — staffing levels, program availability, and support services — not standardized test scores or academic outcomes. Limited indicators were available, so the index reflects partial data.