Enrollment
278
California · 2024-25 NCES data
Elementary school (grades K-5) · Napa, CA
Stone Bridge
Federal NCES profile for Stone Bridge, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 30/100.
2024-25 NCES dataElementary school (grades K-5)NCES 060197810975Charter school
👥 S:T ratio 0
🌟 Gifted program 30
📋 Attendance 59
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Stone Bridge earns 30/100 on the Resource Investment Index, with class sizes larger than 92% of California schools.
- #6 of 14
- elementary schools in Napa · Resource Index
- 30
- Resource Index · Lower
- 27.8:1
- large classes for California
- 12.7%
- free-lunch eligible
Stone Bridge has class sizes larger than 92% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Stone Bridge ranks #6 of 14 elementary schools in Napa, CA.
School address
District: Stone Bridge District · California
NCES ID 060197810975 Verify on NCES CCD record →
Teachers (FTE)
10.0
Federal CCD staff survey
Students per teacher
27.8:1
vs 21.5:1 California avg
+29% vs state
Free-lunch eligible
12.7%
vs 55.5% California avg
-77% vs state
Student-teacher ratio in context
How Stone Bridge compares with California and U.S. medians
What stands out at Stone Bridge
Stone Bridge is a lower-poverty, mid-sized charter elementary school in Napa, California, enrolling 278 students.
Class loads run heavy: 27.8:1 is larger than about 92% of California schools and 29% above the 21.5:1 state mean, so each teacher carries more students than is typical.
Comparatively few students face economic hardship here, 12.7% free-meal eligibility runs 77% below the California average.
Enrollment of 278 puts it in the smaller third of California schools by headcount.
Its Resource Investment Index sits near the middle of the pack among 9,998 scored California schools.
Among 320 similarly sized, similarly resourced-need California schools statewide, it ranks #231, in the lower tier once campus size and economic need are matched.
Its student body is led by White (62%) and Hispanic or Latino (20%) (diversity index 56/100).
16.5% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
The surrounding Stone Bridge District spends $10,810 per pupil, 35% below the California average, a leaner-resourced district than most.
Among Napa's elementary schools, it stands alongside Browns Valley Elementary (651 students): Stone Bridge is smaller than that campus by headcount and runs leaner classes (27.8:1 vs 32.5:1).
Stone Bridge District is a single-school charter district, so Stone Bridge 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 Stone Bridge compares
Stone Bridge on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 27.8:1 | ▲ 29% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 12.7% | ▼ 77% | 55.5% | 51.7% |
| Enrollment | 278 | top 76% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
27.8:1
Leaner classes than 3% of US schools, heavier class loads than most.
278
Bigger than 29% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
12.7%
free-lunch eligible
- 77% below the California average of 55.5%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
27.8:1
students per teacher
- 29% above state mean
Top 92% in California - lower ratio than 8% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
16.5%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Funding equity
$10,810
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
0
in-school suspensions + 0 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.0 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 61.7%
Hispanic or Latino 20.2%
Two or More 12.6%
Asian 4.3%
African American 1.1%
Largest group: White at 61.7% of enrollment.
Student-body diversity index 56.1/100
Simpson diversity index - at 56.1, Stone Bridge is more mixed than the California school average of 46.0.
Programs
Funding & spending
District-wide per-pupil expenditure for Stone Bridge District, which includes Stone Bridge.
$10,810
Per student
-35%
vs California
Avg $16,509
-35%
vs U.S.
Avg $16,593
Revenue mix
Local 73.4%
State 26.0%
Federal 0.6%
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.
Similar elementary schools in Napa
6 comparable elementary schools (grades K-5) serving the same city.
Browns Valley Elementary
Standard public school
651 students 32.5:1 students per teacher
Napa Valley Language Academy
Standard public school
560 students 25.5:1 students per teacher
Shearer Elementary
Standard public school
501 students 29.5:1 students per teacher
Willow Elementary
Standard public school
472 students 23.6:1 students per teacher
Pueblo Vista Elementary
Standard public school
451 students 26.5:1 students per teacher
Bel Aire Park Elementary
Standard public school
410 students 29.3:1 students per teacher
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 (~278 students)
Next steps
Verify locally before acting on Stone Bridge's federal record.
- Compare Stone Bridge against another school. Compare schools
- Stone Bridge 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 Stone Bridge
How many students attend Stone Bridge?
Stone Bridge has 278 students enrolled. It is an elementary school in Napa, CA.
What is the student-teacher ratio at Stone Bridge?
The student-teacher ratio at Stone Bridge is 27.8:1, which is 29% higher than the California average of 21.5:1 and 77% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Stone Bridge?
12.7% of students at Stone Bridge are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Stone Bridge?
The largest demographic group at Stone Bridge is White at 61.7% of enrollment, in Napa, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 56.1/100.
What is the Resource Investment Index for Stone Bridge?
Stone Bridge has a Resource Investment Index of 30/100 (lower 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 Stone Bridge rank among elementary schools in Napa?
By Resource Investment Index, Stone Bridge ranks #6 of 14 elementary schools in Napa, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Napa on the city page.
Is Stone Bridge a good school?
Stone Bridge earns 30/100 on the Resource Investment Index, with class sizes larger than 92% of 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 Stone Bridge District?
None; Stone Bridge District is a single-school charter district, and Stone Bridge 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.