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What's the most underrated thing about Arroyo Seco Junior High that outsiders don't know?
Community prompt from u/allk12. Replies below.
Enrollment
1,239
Middle
DISTRICT 1,020 · STATE 659
SCHOOL COMMUNITY·WILLIAM S. HART UNION HIGH·NCES 064251006956
Arroyo Seco Junior High
27171 North Vista Delgado Dr., Valencia, CA 91354 · (661) 296-0991 · Los Angeles County
GRADES 07–08MIDDLE21-SUBURBREGULAR SCHOOL1,239 STUDENTS
B
allk12 Grade
Scored higher than 64% of California public middle schools
- A-Test scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- CBeats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- BThree-year trend Change in reading and math proficiency over the last three test years.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded California public middle schools
Student : Teacher
24.4:1
51 FTE teachers
DISTRICT 22.3:1 · STATE 20.7:1
Free / Reduced Lunch
17%
213 students
DISTRICT 31% · STATE 65%
Community
6
0 members
Enrollment and student:teacher ratio compared against other middle schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 7 | 623 | 50% |
| Grade 8 | 616 | 50% |
Student demographics
69%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 67% · STATE 62% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Test scores
CAASPP 2024-25 . % met or exceeded standardEnglish Language Arts
68.6%
CA avg 49.1% . +5.6pp since 2014
Math
55.1%
CA avg 37.7% . +8.1pp since 2014
What this means: On the CAASPP, California's statewide test, about 69 of every 100 students at this school read and write at grade level and about 55 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores are up about 6 points since 2014, while math scores are up about 8 points.
Performance levels, 2024-25
| Subject | Standard Exceeded | Standard Met | Standard Nearly Met | Standard Not Met |
|---|---|---|---|---|
| English Language Arts | 29.5% | 39.1% | 18.9% | 12.5% |
| Math | 31.6% | 23.5% | 25.1% | 19.8% |
Share of tested students at each CAASPP level. Each student counts in one level, so a row adds to about 100%.
CAASPP results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 68.6% | 55.1% |
| 2023-24 | 66.2% | 53.0% |
| 2022-23 | 68.6% | 49.4% |
| 2021-22 | 67.8% | 49.1% |
| 2018-19 | 72.5% | 54.8% |
| 2017-18 | 69.5% | 55.1% |
| 2016-17 | 70.8% | 58.4% |
| 2015-16 | 71.0% | 55.0% |
| 2014-15 | 63.0% | 47.0% |
% met or exceeded standard, all students and all tested grades.
Source: CAASPP. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
60.7%
composite math + reading, all grades
Predicted
69.5%
based on CA schools with similar FRL share
Beats by
-8.7pp
below demographic expectation
What this means: About 61% of students here test proficient in math and reading, compared with the roughly 69% typical for California schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among California's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Arroyo Seco Junior High
Arroyo Seco Junior High's state test result (60.7% proficient) is higher than 1 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Arroyo Seco Junior High this school | 1,239 | 17.2% | 60.7% |
| Adams Middle Redondo Beach | 1,165 | 17.9% | 67.8% |
| Sharon Christa McAuliffe Middle Los Alamitos | 1,018 | 22.3% | 64.2% |
| Oak Middle Los Alamitos | 998 | 14.5% | 73.0% |
| Benicia Middle Benicia | 947 | 22.0% | 48.9% |
| Price Charter Middle San Jose | 959 | 16.7% | 62.9% |
Matched among California middle schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Arroyo Seco Junior High ranks
Among middle schools| Measure | This school | In California | In Los Angeles County |
|---|---|---|---|
| State test proficiency ranked highest first | 60.7% | #208 of 1,224 | #41 of 248 |
| Math proficiency ranked highest first | 55.1% | #226 of 1,227 ▼ 8 | #45 of 248 ▼ 2 |
| Reading proficiency ranked highest first | 68.6% | #205 of 1,227 ▲ 10 | #40 of 248 ▲ 4 |
| 3-year test score change ranked biggest gain first | +3.4pp | #478 of 1,214 | #143 of 247 |
| Enrollment ranked largest first | 1,239 | #59 of 1,377 | #22 of 317 |
| Students per teacher ranked fewest first | 24.4:1 | #1,125 of 1,279 | #248 of 301 |
| Diversity index ranked most diverse first | 68.6% | #180 of 1,278 | #28 of 301 |
| Free and reduced lunch ranked highest share first | 17.2% | #1,247 of 1,329 | #301 of 312 |
| Enrollment change since 2017-18 ranked steepest decline first | -4.3% | #828 of 930 | #194 of 213 |
Ranked against other public middle schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
1,239
+26 (+2%) vs 2020
+19% since 1990-91, when it was 1,044
Student : Teacher
24.4:1
was 23.8:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 1,239 | 50.8 | 24.4:1 | 17% (213) |
| 2023-24 | 1,240 | 51.6 | 24.0:1 | 15% (192) |
| 2022-23 | 1,217 | 49.9 | 24.4:1 | 17% (203) |
| 2020-21 | 1,213 | 51 | 23.8:1 | 18% (219) |
| 2017-18 | 1,294 | 51.8 | 25.0:1 | 17% (216) |
| 2015-16 | 1,220 | 48 | 25.4:1 | 13% (156) |
| 2010-11 | 1,217 | N/A | N/A | 9% (108) |
| 2000-01 | 1,495 | 65 | 23.0:1 | 2% (36) |
| 1990-91 | 1,044 | 43 | 24.3:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Arroyo Seco Junior High.
Since 2017-18: students down 4% (1,294 to 1,239); teachers down 2% (51.8 to 50.8).
About Arroyo Seco Junior High
Arroyo Seco Junior High is a high-enrollment middle school in Valencia, California, under William S. Hart Union High. The school covers grades 7 through 8 and reported 1,239 students in 2024-25. On average, middle schools in California enroll around 659, and this school is 88% larger than that mark.
Arroyo Seco Junior High is one school in William S. Hart Union High, a system of 16 schools with 20,465 students.
The largest group at Arroyo Seco Junior High is Hispanic students, at 38%. After that, the student body is 38% White, 13% Asian, 7% multiracial, and 3% Black. Census figures show Los Angeles County is about 48% Hispanic. Measured by the diversity index, the student body scores 69%.
Its staff includes 50.8 full-time-equivalent teachers, for about 24.4 students per teacher. The average for middle schools in California, 20.7:1, is lower. Arroyo Seco Junior High has a free or reduced-price lunch rate of 17%. The average for public schools in Los Angeles County is 70%.
On the allk12 Grade, Arroyo Seco Junior High lands at B, ahead of 64% of California public middle schools.
Arroyo Seco Junior High's average proficiency rate across its state test results of 60.7% is 8.7 points below the 69.5% the model predicts from its lunch-eligibility share.
Los Angeles County is the school's county. There, the median household earns about $90,112 a year, a bachelor's degree or higher is held by about 36% of adults, and the poverty rate is about 10%. Arroyo Seco Junior High shares Los Angeles County with 2,243 other public schools.
About 0.2 miles separate Arroyo Seco Junior High from the closest public school, Santa Clarita Elementary. The five-mile area around Arroyo Seco Junior High holds at least 8 other public schools. Ranking the closest schools with test data puts Arroyo Seco Junior High at 6th of 9.
Arroyo Seco Junior High is coded as Suburb: Large in federal locale data.
Federal data show 1,213 students in 2020-21 and 1,239 in 2024-25, a difference of under 3%.
This page is a place to ask questions and share updates about fundraisers, report cards, and school supplies at Arroyo Seco Junior High. Members of the school community can share what they know.
Los Angeles County at a glance
View full county profilePopulation
9,808,667
Census ACS
Median income
$90,112
Household, ACS
Bachelor's+
36%
Adults 25+
Poverty rate
10%
Below federal line
Schools in county
2,244
1,265,907 students
Quick facts
Related schools
Other schools in William S. Hart Union High
- Saugus HighHigh · 2,317 students
- Valencia HighHigh · 2,286 students
- Golden Valley HighHigh · 1,980 students
- Canyon HighHigh · 1,952 students
- William S. Hart HighHigh · 1,941 students
- West Ranch HighHigh · 1,777 students
Other schools in Valencia
- Valencia HighHigh · 2,286 students
- West Ranch HighHigh · 1,777 students
- West Creek AcademyElementary · 983 students
- Bridgeport ElementaryElementary · 866 students
- Valencia Valley ElementaryElementary · 738 students
- Meadows ElementaryElementary · 729 students
Nearby schools
- Santa Clarita Elementary0.2 mi · 170
- Highlands Elementary0.8 mi · 666
- James Foster Elementary0.8 mi · 508
- Emblem Academy0.9 mi · 810
- Charles Helmers Elementary0.9 mi · 524
- North Park Elementary1.1 mi · 441
Frequently asked questions
About Arroyo Seco Junior HighHow large is Arroyo Seco Junior High?
Arroyo Seco Junior High enrolls approximately 1,239 students in grades 07-08.
What grades does Arroyo Seco Junior High serve?
Arroyo Seco Junior High serves grades 07-08.
How many students per teacher at Arroyo Seco Junior High?
Approximately 24.4:1 students per teacher at Arroyo Seco Junior High.
What is the student diversity at Arroyo Seco Junior High?
Student demographics at Arroyo Seco Junior High are roughly 38% White, 38% Hispanic, 3% Black, 13% Asian, 7% Two or more.
What district is Arroyo Seco Junior High in?
Arroyo Seco Junior High is part of William S. Hart Union High.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.