Enrollment
564
California · 2024-25 NCES data
Elementary school (grades K-5) · Plumas Lake, CA
Rio Del Oro Elementary
Federal NCES profile for Rio Del Oro Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 36/100.
2024-25 NCES dataElementary school (grades K-5)NCES 063118011547
👥 S:T ratio 10
🌟 Gifted program 30
📋 Attendance 68
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Rio Del Oro Elementary earns 36/100 on the Resource Investment Index, with class sizes near the California median. It is also more racially and ethnically mixed than most California schools.
- #1 of 3
- public schools in Plumas Lake · Resource Index
- 36
- Resource Index · Typical
- 22.6:1
- students per teacher
- 28.1%
- free-lunch eligible
Rio Del Oro Elementary has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Rio Del Oro Elementary ranks #1 of 3 public schools in Plumas Lake, CA.
School address
District: Plumas Lake Elementary · California
NCES ID 063118011547 Verify on NCES CCD record →
Teachers (FTE)
25.0
Federal CCD staff survey
Students per teacher
22.6:1
vs 21.5:1 California avg
+5% vs state
Free-lunch eligible
28.1%
vs 55.5% California avg
-49% vs state
Student-teacher ratio in context
How Rio Del Oro Elementary compares with California and U.S. medians
What stands out at Rio Del Oro Elementary
Rio Del Oro Elementary is a mid-sized elementary school in Plumas Lake, California, enrolling 564 students.
At 22.6:1, its student-teacher ratio sits close to the California median, within a few percentage points of the 21.5:1 state norm, neither notably crowded nor notably small.
Economic need runs somewhat below the state's typical profile, with 28.1% of students eligible for free meals.
With 564 students, its enrollment sits close to the California median campus size.
Its Resource Investment Index lands in the upper third of 9,998 scored California schools.
Against 1,389 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #511.
Its student body is led by White (37%) and Hispanic or Latino (35%), more mixed than most schools in the state (diversity index 72/100).
12.9% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
The surrounding Plumas Lake Elementary spends $12,951 per pupil, 22% below the California average, a leaner-resourced district than most.
Among Plumas Lake's elementary schools, it stands alongside Cobblestone Elementary (590 students): Rio Del Oro Elementary is smaller than that campus by headcount and runs leaner classes (22.6:1 vs 24.6:1).
Plumas Lake Elementary also operates Cobblestone Elementary (590 students) and Riverside Meadows Intermediate (528 students) alongside Rio Del Oro Elementary.
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 Rio Del Oro Elementary compares
Rio Del Oro Elementary on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 22.6:1 | ▲ 5% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 28.1% | ▼ 49% | 55.5% | 51.7% |
| Enrollment | 564 | top 36% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
22.6:1
Leaner classes than 9% of US schools, heavier class loads than most.
564
Bigger than 69% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
28.1%
free-lunch eligible
- 49% 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
22.6:1
students per teacher
- 5% above state mean
Top 59% in California - lower ratio than 41% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
12.9%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$12,951
per pupil, district-wide
- below California avg of $16,509
Well below the U.S. average per-pupil spend, a notably leaner funding position that may affect programs, facilities, and staffing.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
4
in-school suspensions + 10 out-of-school
Suspension rate: 0.7 per 100 students. Combined in-school and out-of-school rate: 2.5 per 100 students. Reported via the Civil Rights Data Collection.
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
White 36.7%
Hispanic or Latino 34.6%
Two or More 13.8%
Asian 10.1%
African American 3.7%
Native Hawaiian / Pacific Islander 0.9%
American Indian / Alaska Native 0.2%
Largest group: White at 36.7% of enrollment.
Student-body diversity index 71.5/100
Simpson diversity index - at 71.5, Rio Del Oro Elementary is more mixed than the California school average of 46.0.
Programs
Funding & spending
District-wide per-pupil expenditure for Plumas Lake Elementary, which includes Rio Del Oro Elementary.
$12,951
Per student
-22%
vs California
Avg $16,509
-22%
vs U.S.
Avg $16,593
Revenue mix
Local 30.2%
State 61.8%
Federal 8.1%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Rio Del Oro Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Cobblestone Elementary | Similar size | Similar economic need | Higher S:T ratio |
| Riverside Meadows Intermediate | Similar size | Similar economic need | Lower S:T ratio |
Comparisons are relative to Rio Del Oro Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 590
- Students per teacher
- 24.6:1
- Resource Index
- 35/100
- Enrollment
- 528
- Students per teacher
- 21.1:1
- Resource Index
- 36/100
Similar elementary schools in Plumas Lake
1 comparable elementary schools (grades K-5) serving the same city.
Similar elementary 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 (~564 students)
Similar student-teacher ratio (~22.6:1)
Next steps
Verify locally before acting on Rio Del Oro Elementary's federal record.
- Compare Rio Del Oro Elementary against another school. Compare schools
- Plumas Lake Elementary'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 Rio Del Oro Elementary
How many students attend Rio Del Oro Elementary?
Rio Del Oro Elementary has 564 students enrolled. It is an elementary school in Plumas Lake, CA.
What is the student-teacher ratio at Rio Del Oro Elementary?
The student-teacher ratio at Rio Del Oro Elementary is 22.6:1, which is 5% higher than the California average of 21.5:1 and 44% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Rio Del Oro Elementary?
28.1% of students at Rio Del Oro Elementary are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Rio Del Oro Elementary?
The largest demographic group at Rio Del Oro Elementary is White at 36.7% of enrollment, in Plumas Lake, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 71.5/100.
What is the Resource Investment Index for Rio Del Oro Elementary?
Rio Del Oro Elementary has a Resource Investment Index of 36/100 (typical reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Rio Del Oro Elementary rank among public schools in Plumas Lake?
By Resource Investment Index, Rio Del Oro Elementary ranks #1 of 3 public schools in Plumas Lake, 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 Plumas Lake on the city page.
Is Rio Del Oro Elementary a good school?
Rio Del Oro Elementary earns 36/100 on the Resource Investment Index, with class sizes near the California median. 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 Plumas Lake Elementary?
Besides Rio Del Oro Elementary, Plumas Lake Elementary also operates Cobblestone Elementary (590 students) and Riverside Meadows Intermediate (528 students). See the Plumas Lake Elementary district page for the complete list.
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.