School Profile · Lathrop
River Islands High: This school runs ahead of the state average. The bar itself is the harder conversation.
River Islands posts 42% meeting the standard against 36% statewide — ahead of most, with real headroom above the bar.
16601 Riptide Way, 95330 (opens in new tab)·Banta Unified·Lathrop·Grades 9-12·512 students·38% low-income·Charter·2024–25 CAASPP·(209) 717-6715·Website
Charter school — publicly funded, independently operated, open enrollment via lottery. Learn more
Scope Score
45
🌱 Building Momentum · Developing
ranked #1,077 statewide
River Islands High scores 45 of 100 on SchoolScope's Scope Score — the 50th percentile of 2,160 California high schools (CDE CAASPP 2025).
Measures test performance, attendance, and climate — not arts, community, or your kid. How we score →
Most rating sites would stop at “42% proficient” and call it done. River Islands deserves a closer read. The school sits in Lathrop, where one in three students qualify for free or reduced lunch — and reading the numbers without that context misreads the school.
The headline number: 16.1% chronic absenteeism — versus 30.2% statewide. Attendance is the quietest strong signal a school can post.
As a charter, River Islands enrolls by application, not address — the score reads the same, the enrollment path doesn't.
The 4 things our score weighs
Exceeded standard
15.6%
State 15.8%
0.2pp below state avg
Met or exceeded
42.3%
State 35.7%
6.5pp above state avg
Chronic absenteeism
16.1%
State 30.2%
14.1pp below state avg
Suspension rate
6.5%
State 3.6%
2.9pp above state avg
Worth a school visit
Ask how the school challenges kids who clear the standard early. The gap between meeting and exceeding is where pacing shows.
Where the path goes
The path below follows attendance boundaries — scores shown for each next step.
Estimated K-12 Path
Estimated K-12 path based on district and proximity. Actual attendance zones may differ. Contact your school district for official feeder information.
Your other options
Private alternatives nearby
Private schools within ~10 miles. These schools do not participate in state testing and cannot be scored or ranked.
The community around it
Community Profile
Context — not part of the Scope ScoreStudent demographics
Hispanic29.9%
White8.0%
Asian29.3%
Black10.9%
Other21.9%
GenderFemale 45.3%Male 54.7%
Low IncomeFree/reduced lunch eligible 37.9% (26pp below CA avg)
Resources & Access
Enrollment
512
938 below CA avg (~1,450)
Student-Teacher Ratio
19:1
2 fewer students per teacher than CA avg
Teacher Salary Range
$59,858 – $115,707
District schedule · CA median ~$98K
At River Islands High in Lathrop, 46.0% of low-income students met or exceeded the ELA standard in 2025, compared to 26.5% district-wide and 38.2% statewide. River Islands High outperforms its district average for low-income students by 19.5 percentage points in ELA. Other subgroups: Low-Income students (25.5% Math proficient); Asian students (56.8% ELA proficient). The largest proficiency gap is 33.9 percentage points for disabilities students. Data source: California Department of Education, CAASPP 2024-25. 50 students tested.
Equity Gaps
ELA · Disabilities−33.9pp
18.8% vs 52.7% overall · n=16
3 more gaps by subject
ELA Exceeded · Disabilities−12.1pp
6.3% vs 18.3% overall · n=16
Math · Disabilities−25.6pp
6.3% vs 31.8% overall · n=16
Math Exceeded · Hispanic−7.0pp
5.9% vs 12.9% overall · n=34
Subgroups with fewer than 15 students are excluded for privacy. Gaps of less than 3 percentage points are not shown.
Subgroup Proficiency
Low-Income51 tested
ELA 46.0%·Math 25.5%· +19.5pp vs district
Asian37 tested
ELA 56.8%·Math 46.0%
Hispanic34 tested
ELA 45.5%·Math 8.8%· +24.9pp vs district
Weighted average across tested grades. Subgroups with fewer than 15 students excluded. Data: CDE CAASPP 2024-25.
Neighborhood Context
Median Income
$125K
$40K above CA median
Median Home Value
$643K
$16K below CA median
Bachelor's+
28%
7pp below CA avg
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2024) · ZIP-level
Whole Child
Teacher experience, college/career readiness, and more. Context only — never part of the Scope Score.
Teacher Experience
7.5 years avg experience
32 teachers · 13% first-year · 9% second-year
Source: CDE SARC, 2024-25
Community Profile provides context about who attends this school and the resources available. These factors are never part of the Scope Score. Learn why →
For the data nerdsEvery number on this page
Score factors, grade-level breakdowns, subgroup proficiency, and peer comparisons.
For the data nerds
Every number on this page
Score factors, grade-level breakdowns, subgroup proficiency, and peer comparisons.
01Score factorsWeighted composite · 2024–25
Exceeded standard · 22%
15.6%
↓ vs CA 15.8% · 50th pctile
Met or exceeded · 18%
42.3%
↑ vs CA 35.7% · 55th pctile
Chronic absenteeism · 5%
16.1%
↑ vs CA 30.2% · 62th pctile
Suspension rate · 5%
6.5%
↓ vs CA 3.6% · 37th pctile
02By grade & subgroupCAASPP 2024–25 · % of tested students
| ELA | Tested | EXC | MET | NEAR | NOT | MET+ | +/CA |
|---|---|---|---|---|---|---|---|
| Grade 11 | 131 | 18% | 34% | 29% | 18% | 53% | +5 |
| Math | Tested | EXC | MET | NEAR | NOT | MET+ | +/CA |
|---|---|---|---|---|---|---|---|
| Grade 11 | 132 | 13% | 19% | 25% | 43% | 32% | +8 |
| Science (CAST) | Tested | EXC | MET | NEAR | NOT |
|---|---|---|---|---|---|
| Grade 5/8/11 | 17 | 0% | 24% | 59% | 18% |
CAST is tested in grades 5, 8, and once in high school — not annually. Not part of the Scope Score.
| Subgroup · ELA | Tested | MET+ | vs district | vs CA |
|---|---|---|---|---|
| Socioeconomically Disadvantaged | 50 | 46.0% | +20 | +8 |
| Asian | 37 | 56.8% | — | −18 |
| Hispanic/Latino | 33 | 45.5% | +25 | +7 |
03Peer comparison · nearest high schoolssorted by Scope Score
| School | Dist | Scope | EXC | MET+ | Growth | Susp |
|---|---|---|---|---|---|---|
| River Islands High ← | — | 45 | 15.6% | 42.3% | — | 6.5% |
| Sierra High | 2.7 mi | 52 | 23.5% | 51.7% | — | 2.4% |
| Lathrop High | 1.5 mi | 47 | 14.4% | 41.5% | — | 4.4% |
| California average | — | 44 | 15.8% | 35.7% | — | 3.6% |
04More measurescontext · not all part of the Scope Score
AP Exam Prepared
Not offered
This school may not offer AP courses
Source: CA Dept. of Education · CAASPP 2024–25 · n=2,160 high schools · Data updated 2026-07-03methodology · data updates · CSV · report issue
Frequently asked questions
Is River Islands High a good high school?
River Islands High has a Scope Score of 45 out of 100, placing it in the 50th percentile of California high schools and ranked #1,077 statewide. 15.6% of students exceeded the state standard on the 2025 CAASPP assessment, which is near the California average of 15.8%. The Scope Score weights six dimensions for high schools: exceeded standard (43%), met or exceeded (22%), grade 3-to-5 growth (15%), chronic absenteeism (10%), ELPAC English Learner proficiency (5%), and suspension rate (5%). Data source: California Department of Education CAASPP 2025, analyzed by SchoolScope.
What are River Islands High's CAASPP test scores?
On the 2025 CAASPP Smarter Balanced Assessment, 42.3% of students at River Islands High met or exceeded the state standard in ELA and Math combined, and 15.6% exceeded it. The gap between those numbers matters: 26.6% of students are at the proficiency floor, while 15.6% pushed past it. Most rating sites report only the combined "proficient" number. SchoolScope surfaces the exceeded-vs-met split because it reveals whether a school's curriculum challenges students beyond minimum proficiency or paces toward it. 263 student-subject combinations were assessed.
How does River Islands High rank in California?
River Islands High ranks #1,077 among California high schools by Scope Score, placing it in the 50th percentile. This ranking is based on a weighted composite of 2025 CAASPP test performance (exceeded and met rates), chronic absenteeism, and suspension rate. Unlike single-number ratings, the Scope Score shows what drives the ranking so parents can decide what matters most to their family. See full methodology.
What is the attendance and school culture like at River Islands High?
16.1% of students at River Islands High are chronically absent (missing 10% or more of school days), which is better than the California average of 30.2%. The suspension rate is 6.5%. SchoolScope includes these culture metrics in the Scope Score because they reflect day-to-day school experience in ways test scores alone cannot.
How does River Islands High compare to other schools in Lathrop?
River Islands High scores 45/100 (50th percentile) among California high schools. To compare with nearby schools, SchoolScope shows the same metrics side by side: exceeded rate, proficiency, growth trajectory, and school culture indicators. The school serves 512 students. Use the schools in Lathrop page or the map view to compare all high schools nearby.
How does River Islands High serve low-income and underrepresented students?
At River Islands High in Lathrop, 46.0% of low-income students met or exceeded the ELA standard in 2025, compared to 26.5% district-wide and 38.2% statewide. River Islands High outperforms its district average for low-income students by 19.5 percentage points in ELA. Other subgroups: Low-Income students (25.5% Math proficient); Asian students (56.8% ELA proficient). The largest proficiency gap is 33.9 percentage points for disabilities students. Data source: California Department of Education, CAASPP 2024-25. 50 students tested. SchoolScope shows disaggregated test scores by demographic subgroup so you can see how a school performs for your child's specific group — not just the school-wide average. Subgroup data is context, not part of the Scope Score: we don't penalize schools for who they serve. See our equity approach.