No UC admissions data on file for River Islands High.
This school doesn't appear in UCOP's source-school records (it may send few or no applicants to UC). Its enrollment trend and similar-school comparison are still below.
Compare with peers
Most similar nearby schools
Aspire Langston Hughes Academy → Weston Ranch High School → Delta Charter High School → Ripon High School → Lathrop High School → Compare all similar →Keep this page current
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How River Islands High compares for families
What families should know about River Islands High.
- ▸ vs Similar SchoolsThe closest comparables nearby: Aspire Langston Hughes Academy, Weston Ranch High School, Delta Charter High School and 2 more. See the sidebar to compare side-by-side.
For Parents
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Objective, government-grade data — no school pays us for placement.
SBAC academic outcomes — grade 11, 2025
Share of grade-11 students meeting or exceeding the California standard on Smarter Balanced ELA and Math. This is the academic-readiness signal that pairs with UC Reach (post-grad outcomes), stability (retention), and absenteeism (engagement). Note: statewide median Math is only ~20% — a school at 20% isn't an outlier; one at 45%+ genuinely is.
Source: California Assessment of Student Performance and Progress (CAASPP) Smarter Balanced research files. Benchmarks limited to non-virtual public & charter HS with ≥30 tested students.
Student composition — 2025-26
HS grades 9–12 racial/ethnic composition and program subgroups, from CDE Census Day Enrollment. Two-year shift shown when ≥1 pt — surfaces how the community served has changed since 2023-24.
Race / ethnicity
Program subgroups
Source: California Department of Education, Census Day Enrollment 2025-26 (HS grades 9–12). Δ shown when shift is ≥1 pt since 2023-24. Categories below 0.5% omitted.
Chronic absenteeism — 2024-25
Share of students missing 10% or more of expected attendance — the leading indicator that often precedes the demand decline shown above. Families disengaging tend to raise absenteeism first, then formally leave. Basis: grades 9–12.
Absenteeism is up 4.2 pp since 2022-23. A rising absenteeism trend often precedes formal departure — worth investigating which subgroups are driving it.
Source: California Department of Education, Chronic Absenteeism 2024-25. Benchmarks limited to non-virtual public & charter HS with ≥100 eligible students. CDE didn't publish a usable 2019-20 file (COVID).
Enrollment trend & projection
How does River Islands High really compare on getting kids to college?
Unlock a head-to-head snapshot of River Islands High against its 10 most similar nearby schools — matched on size, location, type. See exactly where it stands on the college pipeline.
Your similar-school group includes
Aspire Langston Hughes Academy · Weston Ranch High School · Delta Charter High School · Ripon High School · Lathrop High School · East Union High School · +4 more
Enrollment stability & demand — 2024-25
Two complementary signals: retention (do students stay once enrolled?) and demand (are families choosing the school?). Read against the San Joaquin County baseline — the demographic tide is moving every CA HS, so a school's gap vs. county is the actionable signal.
45 of 548 students who enrolled at River Islands High this year didn't maintain continuous enrollment (8.2% non-stability). Mid-year transfers, dropouts, and other exits are all counted.
Stability by student group
Nearest peer high schools
Source: California Department of Education, Stability Rate 2024-25. Benchmarks limited to non-virtual public & charter HS with ≥100 cumulative enrollees so by-design-high-churn continuation schools don't dominate the bottom of the distribution. Cumulative enrollment counts every student on the rolls during the year, so it can exceed peak-day enrollment.
For School Admins
The full Reach Report for River Islands High
A board- and LCAP-ready intelligence brief: your enrollment retention and college outcomes, benchmarked against your closest competitors, with a 5-year forecast, concrete steps to act on, and the rigor + outcomes story you can share with your families. Built from primary public data — prepared for you, not auto-generated.
- ✓Student-retention benchmarking vs your county median — and the LCAP evidence to back your goals
At a glance
JSON · Using this page with an AI assistantRiver Islands High is a public high school in Lathrop, San Joaquin County, California.
Enrollment was 837 students in 2026, up 675% since 2023.
Sources: University of California Office of the President (admissions), California Department of Education (enrollment, A-G, college-going), and the school's own published documents where named.
Questions families ask
How many students attend River Islands High? Enrollment was 837 students in 2026, up 675% since 2023.
Analysis: Test Prep Gurus (High School Reach, highschoolreach.com). These figures may be quoted with attribution to Test Prep Gurus.
What does AI tell parents about River Islands High?
When a parent asks an AI assistant about River Islands High, the answer is built from a handful of sources, and Reach is often one of them. We will send your school a short report on what AI says about River Islands High and where it comes from. The first report is free.
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