Enrollment
506
Oregon · 2024-25 NCES data
Elementary school (grades K-5) · Estacada, OR
River Mill Elementary School
Federal NCES profile for River Mill Elementary School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 21/100.
2024-25 NCES dataElementary school (grades K-5)NCES 410470000140
👥 S:T ratio 8
🌟 Gifted program 70
🎓 Counselors 0
📋 Attendance 5
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
River Mill Elementary School earns 21/100 on the Resource Investment Index, with class sizes larger than 91% of Oregon schools.
- #3 of 4
- public schools in Estacada · Resource Index
- 21
- Resource Index · Lower
- 23:1
- large classes for Oregon
- 40.7%
- free-lunch eligible
River Mill Elementary School has class sizes larger than 91% of Oregon schools. Computed live against every Oregon school reporting to NCES.
By Resource Investment Index, River Mill Elementary School ranks #3 of 4 public schools in Estacada, OR.
School address
District: Estacada Sd 108 · Oregon
NCES ID 410470000140 Verify on NCES CCD record →
Teachers (FTE)
22.0
Federal CCD staff survey
Students per teacher
23:1
vs 17.6:1 Oregon avg
+31% vs state
Free-lunch eligible
40.7%
vs 52.8% Oregon avg
-23% vs state
Student-teacher ratio in context
How River Mill Elementary School compares with Oregon and U.S. medians
What stands out at River Mill Elementary School
River Mill Elementary School is a mid-sized elementary school in Estacada, Oregon, enrolling 506 students.
Class loads run heavy: 23:1 is larger than about 91% of Oregon schools and 31% above the 17.6:1 state mean, so each teacher carries more students than is typical.
Economic need runs somewhat below the state's typical profile, with 40.7% of students eligible for free meals.
Enrollment of 506 puts it in the larger third of Oregon schools by headcount.
Its Resource Investment Index trails 96% of the 1,273 Oregon schools with a score on record, one of the lower results on this measure.
Among 141 similarly sized, similarly resourced-need Oregon schools statewide, it ranks #132, in the lower tier once campus size and economic need are matched.
Its student body is led by White (74%) and Hispanic or Latino (18%) (diversity index 42/100).
Counselor access is stretched at roughly 506 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Chronic absenteeism is elevated: 37.9% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding Estacada Sd 108 spends $9,772 per pupil, 46% below the Oregon average, a leaner-resourced district than most.
Among Estacada's elementary schools, it stands alongside Clackamas River Elementary School (433 students): River Mill Elementary School is larger than that campus by headcount and runs heavier classes (23:1 vs 21.6:1).
Estacada Sd 108 also operates Summit Learning Charter (1,355 students) and Estacada High School (558 students) alongside River Mill Elementary School.
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 Mill Elementary School compares
River Mill Elementary School on the metrics families compare, against Oregon and U.S. means.
| Metric | This school | vs Oregon | Oregon avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 23:1 | ▲ 31% | 17.6:1 | 15.7:1 |
| Free-lunch eligible | 40.7% | ▼ 23% | 52.8% | 51.7% |
| Enrollment | 506 | top 22% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
23:1
Leaner classes than 8% of US schools, heavier class loads than most.
506
Bigger than 62% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
40.7%
free-lunch eligible
- 23% below the Oregon average of 52.8%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
23:1
students per teacher
- 31% above state mean
Top 91% in Oregon - lower ratio than 9% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
37.9%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$9,772
per pupil, district-wide
- below Oregon avg of $18,086
Well below the U.S. average per-pupil spend, a notably leaner funding position that may affect programs, facilities, and staffing.
Support staff
Counselors1.0 FTE
Per 506 students, the combined health-and-guidance staffing load for this school.
Discipline context
6
in-school suspensions + 10 out-of-school
Suspension rate: 1.2 per 100 students. Combined in-school and out-of-school rate: 3.2 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 73.7%
Hispanic or Latino 18.2%
Two or More 7.1%
African American 0.8%
American Indian / Alaska Native 0.2%
Largest group: White at 73.7% of enrollment.
Student-body diversity index 41.9/100
Simpson diversity index - at 41.9, River Mill Elementary School is less mixed than the Oregon school average of 47.1.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Estacada Sd 108, which includes River Mill Elementary School.
$9,772
Per student
-46%
vs Oregon
Avg $18,086
-41%
vs U.S.
Avg $16,593
Revenue mix
Local 29.7%
State 61.7%
Federal 8.6%
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.
How River Mill Elementary School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Summit Learning Charter | Larger | No free-lunch data | Higher S:T ratio |
| Estacada High School | Similar size | Similar economic need | Similar S:T ratio |
| Estacada Middle School | Similar size | Similar economic need | Higher S:T ratio |
| Clackamas River Elementary School | Similar size | Similar economic need | Similar S:T ratio |
Comparisons are relative to River Mill Elementary School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,355
- Students per teacher
- 58.9:1
- Resource Index
- 30/100
- Enrollment
- 558
- Students per teacher
- 22.3:1
- Resource Index
- 31/100
- Enrollment
- 460
- Students per teacher
- 27.1:1
- Resource Index
- 28/100
- Enrollment
- 433
- Students per teacher
- 21.6:1
- Resource Index
- 17/100
Similar elementary schools in Estacada
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 Oregon, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~506 students)
Next steps
Verify locally before acting on River Mill Elementary School's federal record.
- Compare River Mill Elementary School against another school. Compare schools
- Estacada Sd 108'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 Mill Elementary School
How many students attend River Mill Elementary School?
River Mill Elementary School has 506 students enrolled. It is an elementary school in Estacada, OR.
What is the student-teacher ratio at River Mill Elementary School?
The student-teacher ratio at River Mill Elementary School is 23:1, which is 31% higher than the Oregon average of 17.6:1 and 46% higher than the national average of 15.7:1.
What percentage of students receive free lunch at River Mill Elementary School?
40.7% of students at River Mill Elementary School are eligible for free lunch, compared to the Oregon average of 52.8%.
What is the racial and ethnic makeup of River Mill Elementary School?
The largest demographic group at River Mill Elementary School is White at 73.7% of enrollment, in Estacada, OR.
What is the Resource Investment Index for River Mill Elementary School?
River Mill Elementary School has a Resource Investment Index of 21/100 (lower reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does River Mill Elementary School rank among public schools in Estacada?
By Resource Investment Index, River Mill Elementary School ranks #3 of 4 public schools in Estacada, OR. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Estacada on the city page.
Is River Mill Elementary School a good school?
River Mill Elementary School earns 21/100 on the Resource Investment Index, with class sizes larger than 91% of Oregon 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 Estacada Sd 108?
Besides River Mill Elementary School, Estacada Sd 108 also operates Summit Learning Charter (1,355 students), Estacada High School (558 students), and Estacada Middle School (460 students). See the Estacada Sd 108 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.