Enrollment
512
California · 2024-25 NCES data
High school (grades 9-12) · Lathrop, CA
River Islands High
Federal NCES profile for River Islands High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 0/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 060257414622Charter school
👥 S:T ratio 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
River Islands High earns 0/100 on the Resource Investment Index, with class sizes larger than 99% of California schools. It is also more racially and ethnically mixed than most California schools.
- #7 of 8
- public schools in Lathrop · Resource Index
- 0
- Resource Index · Lower
- 56.9:1
- large classes for California
- 33.3%
- free-lunch eligible
River Islands High has class sizes larger than 99% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, River Islands High ranks #7 of 8 public schools in Lathrop, CA.
School address
District: River Islands High District · California
NCES ID 060257414622 Verify on NCES CCD record →
Teachers (FTE)
9.0
Federal CCD staff survey
Students per teacher
56.9:1
vs 21.5:1 California avg
+165% 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
What stands out at River Islands High
River Islands High is a mid-sized charter high school in Lathrop, California, enrolling 512 students.
Class loads run heavy: 56.9:1 is larger than about 99% of California schools and 165% above the 21.5:1 state mean, so each teacher carries more students than is typical.
Economic need runs somewhat below the state's typical profile, with 33.3% of students eligible for free meals.
With 512 students, its enrollment sits close to the California median campus size.
Its Resource Investment Index trails 100% of the 9,998 California schools with a score on record, one of the lower results on this measure.
Among 1,341 similarly sized, similarly resourced-need California schools statewide, it ranks #1,338, in the lower tier once campus size and economic need are matched.
Its student body is led by Asian (48%) and Hispanic or Latino (30%), more mixed than most schools in the state (diversity index 66/100).
Among Lathrop's high schools, it stands alongside Lathrop High (1,486 students): River Islands High is smaller than that campus by headcount and runs heavier classes (56.9:1 vs 20.6:1).
River Islands High District is a single-school charter district, so River Islands High operates independently rather than alongside district-mates.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How River Islands High compares
River Islands High on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 56.9:1 | ▲ 165% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 33.3% | ▼ 40% | 55.5% | 51.7% |
| Enrollment | 512 | top 43% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
56.9:1
Leaner classes than 0% of US schools, heavier class loads than most.
512
Bigger than 63% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
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
56.9:1
students per teacher
- 165% above state mean
Top 99% in California - lower ratio than 1% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
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.
Student-body diversity index 66.2/100
Simpson diversity index - at 66.2, River Islands High is more mixed than the California school average of 46.0.
Similar high schools in Lathrop
1 comparable high schools (grades 9-12) serving the same city.
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of California, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~512 students)
Next steps
Verify locally before acting on River Islands High's federal record.
- Compare River Islands High against another school. Compare schools
- River Islands High District's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
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 56.9:1, which is 165% higher than the California average of 21.5:1 and 262% higher than the national average of 15.7:1.
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% of enrollment, in Lathrop, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 66.2/100.
What is the Resource Investment Index for River Islands High?
River Islands High has a Resource Investment Index of 0/100 (lower reported resources relative to schools nationally) based on 1 factor: student-teacher ratio. Not a test-score or academic measure (national median ~41/100, see methodology). Limited indicators were available, so the index reflects partial data.
How does River Islands High rank among public schools in Lathrop?
By Resource Investment Index, River Islands High ranks #7 of 8 public schools in Lathrop, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Lathrop on the city page.
Is River Islands High a good school?
River Islands High earns 0/100 on the Resource Investment Index, with class sizes larger than 99% of California schools. It is also more racially and ethnically mixed than most California schools. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in River Islands High District?
None; River Islands High District is a single-school charter district, and River Islands High is its only campus.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.