Alder Creek Middle School
Milwaukie, OR · Grades 6–8
Portland-Vancouver-Hillsboro, OR-WA
NeighborhoodDecoded Rank
All factors combined
OR statewide rating — the rank below is this school's statewide position
Bottom 15% decoded
#644 of 667
plausibly #582–657
Oregon schools
#318 · Portland-Vancouver-Hillsboro metro — Oregon side
Achievement Rank
Raw test performance
Bottom 15% achievement
#597 of 667
Oregon schools
#308 · Portland-Vancouver-Hillsboro metro — Oregon side
Lower by Both Measures
Raw scores are modest, and students tend to lose ground relative to peers while enrolled.
Data confidence:Medium1470 students tested 8 years87% participation
Confidence is computed from sample size, year coverage, and participation rate. Higher confidence means the rank shift is stable across years and not driven by a single small cohort.
- Tested students: total students with valid scores across all reported years.
- Years of data: number of school years included. More years smooths year-to-year noise.
- Participation: share of enrolled students who took the assessment. Low participation can bias scores.
What's driving this rank
Decoded Rank: #644 of 667
in Oregon schools
Raw test scores rank this school #597, but families here have higher-than-average income and educational attainment, so the expected score is also high. After accounting for context, this school performs about as predicted — the Decoded Rank is #644.
Each component below is scored on a 0–100 within-metro scale. A qualitative band summarizes where the school lands.
- LowPerforms above what its context predictsCounts for 39% of the rank
After accounting for income and demographics, does this school beat what the data would predict?
- LowStudents gain ground year over yearCounts for 33% of the rank
Are kids at this school learning faster than typical for the metro?
- About averageEquity within the schoolCounts for 17% of the rank
Are students clustered at similar levels, or split between top and bottom?
- StrongMost students were testedCounts for 11% of the rank
Was the rank computed against a representative share of the school's students?
Show the numbersFor the methodology-curious
Each component is converted to a 0–100 within-metro percentile (100 = top of the metro). "Contribution" is the percentile-points the component adds to (or subtracts from) the metro median before the schools are re-ranked into the composite.
| Component | Weight | Percentile | Contribution |
|---|---|---|---|
| Performs above what its context predicts | 39% | 14 | -14.1 |
| Students gain ground year over year | 33% | 2 | -16.1 |
| Equity within the school | 17% | 57 | +1.2 |
| Most students were tested | 11% | 87 | +4.2 |
Why trust this?- Public data sources
- Context-adjusted model
- Confidence shown
- Methodology published
This score uses state assessment data, NCES enrollment data, and Census ACS 5-year neighborhood data. The Decoded Rank adjusts for school context — student demographics, ELL/SPED service rates, and the socioeconomic profile of the surrounding tract — and shows how the school performs relative to expectation, not in absolute terms.
SchoolDecoder is one signal, not a verdict. Decoded Rank is a context-adjusted residual, not a causal claim about teaching quality. See full methodology →
Strongest Subjects (Decoded)
Decoded rank first; achievement rank in parentheses. Sorted by decoded rank, best first. Science is shown for reference only and is not part of any rank, tier, or composite.
Science
2024 proficiency12.3%meeting standard
Tested gradeGrade 8
264 tested
202225.3%202319.9%202412.3%
Shown for reference only — science is not part of any rank.
All Rankings
How this school ranks across the metro, state, and among demographic peers.
| Scope | Achievement | Decoded | Shift |
|---|---|---|---|
| OR (667 schools) | #597 | #644 | |
| Portland-Vancouver-Hillsboro, OR-WA (335 schools) | #308 | #318 | |
| Among similar schools (6 peers) | #3 | #3 |
Resource context
School inputs, not ranking points
These fields describe the school and surrounding neighborhood. They help readers interpret the page, but this is not a dollar-by-dollar or ratio-by-ratio scorecard and the fields here are not components of the Decoded Rank.
- Enrollment
- 831
- Free/reduced-price lunch
- 69.2%
- Student-teacher ratio
- 18.9:1
- Locale
- Suburb, large
- School type
- Regular public school
- Enrollment model
- Neighborhood attendance area
- Neighborhood median income
- $96,944ACS tract proxy
- Neighborhood poverty
- 8.0%ACS tract proxy
- SES index
- 62.1
- Assessment data year
- 2024
- CCD year
- 2023
- ACS vintage
- 2020-2024
Within North Clackamas SD 12: #21 of 21.Bottom quintile in district. View district
Performance Spread
How students are distributed across the four state-assessment proficiency levels — L1: below standard, L2: approaching, L3: meets (proficient), L4: exceeds. This describes the shape of results at the school, not their height.
Students at this school cluster closely on the proficiency ladder.
- Level 1 — Below standard58%
- Level 2 — Approaching standard22%
- Level 3 — Meets standard (proficient)16%
- Level 4 — Exceeds standard4%
Performance Spread measures how evenly students are distributed across the L1..L4 proficiency ladder, treating the levels as an ordered scale (L1=1, L2=2, L3=3, L4=4) and weighting each by its student share. A school where most students cluster at one level has a TIGHT spread; a school split between the bottom and top has a WIDE or BIMODAL spread. Bimodal fires only when BOTH tails are non-trivial AND the middle is relatively hollow (pct_L1 ≥ 15, pct_L4 ≥ 25, pct_L2 + pct_L3 ≤ 60). It describes shape — NOT how high the school's scores are. Methodology
Nearby Schools
Sorted by distance. Both rank columns shown so you can compare quickly.
- Linwood Elementary School0.9 mi
- Sojourner School0.9 mi
- Bilquist Elementary School1.0 mi
- View Acres Elementary School1.0 mi
- Clackamas Web Academy1.1 mi
| School | Rating | Achievement | Decoded | Shift | Story | Confidence |
|---|---|---|---|---|---|---|
| Linwood Elementary School | #265 | #173 | Typical Profile | Medium | ||
| Sojourner School | Rankings coming soon | |||||
| Bilquist Elementary School | #248 | #86 | Typical Profile | High | ||
| View Acres Elementary School | #90 | #132 | Typical Profile | Medium | ||
| Clackamas Web Academy | — | #210 | Est. #203Also HS #35 | Typical Profile | Low | |
Similar Schools
Schools with comparable demographics, income, and size. Both rank columns shown for direct comparison.
| School | Rating | Achievement | Decoded | Shift | Story | Confidence |
|---|---|---|---|---|---|---|
| Talmadge Middle School | #54 | #69 | Typical Profile | Medium | ||
| Rowe Middle School | — | #285 | Est. #224 | Typical Profile | Low | |
| Eagle Point High School | #9 | #8HS | HS outcome | HS pool | ||
| Gordon Russell Middle School | #313 | #332 | Lower by Both Measures | Medium | ||
| Leslie Middle School | #43 | #45 | Typical Profile | High |
Historical Ranks
Year-by-year decoded and achievement ranks. Pandemic-affected years are excluded — we don't interpolate scores across the gap.
| Year | Achievement | Decoded | Shift |
|---|---|---|---|
| 2024 | #308 | #318 | |
| 2023 | #285 | #323 |
Note: assessment transitions (where a state changes its test) are footnoted on the methodology page; trends are not computed across breakpoints.
Trajectory
Not used in the Decoded Rank — shown for context only.
Holding steady
Based on 2 years (2023–2024).
Slope: -2.3 pct/yr (no CI — too few years)
Low confidence
How this works: we fit a linear trend across the available years of Decoded percentile, then bucket the slope into a direction. Wide confidence intervals (uncertain trends) collapse to Holding steady. See the methodology page for thresholds.
Cohort Progression
Kids who started 6th grade here in 2023 lost 34 proficiency points by 7th grade — declining more than 10× faster than the metro median.
Based on 16 cohorts across math + ELA.
Learning rate: -11.8 proficiency points/yr (95% CI -18.7 to -4.9)
Medium confidence
| Cohort | 2015 | 2016 | 2017 | 2018 | 2019 | 2022 | 2023 | 2024 | Slope |
|---|---|---|---|---|---|---|---|---|---|
| ELA · started 8th in 2015 | G8 259 | — | |||||||
| ELA · started 7th in 2015 | G7 248 | G8 243 | -5.2 | ||||||
| ELA · started 6th in 2015 | G6 233 | G7 241 | G8 218 | -7.2 | |||||
| ELA · started 6th in 2016 | G6 250 | G7 236 | G8 237 | -6.3 | |||||
| ELA · started 6th in 2017 | G6 234 | G7 241 | G8 233 | -0.8 | |||||
| ELA · started 6th in 2018 | G6 263 | G7 235 | -27.9 | ||||||
| ELA · started 6th in 2019 | G6 240 | — | |||||||
| ELA · started 8th in 2022 | G8 192 | — | |||||||
| ELA · started 7th in 2022 | G7 213 | G8 190 | -23.7 | ||||||
| ELA · started 6th in 2022 | G6 198 | G7 174 | G8 151 | -23.4 | |||||
| ELA · started 6th in 2023 | G6 205 | G7 171 | -33.6 | ||||||
| ELA · started 6th in 2024 | G6 203 | — | |||||||
| Math · started 8th in 2015 | G8 221 | — | |||||||
| Math · started 7th in 2015 | G7 230 | G8 192 | -37.4 | ||||||
| Math · started 6th in 2015 | G6 204 | G7 213 | G8 189 | -7.6 | |||||
| Math · started 6th in 2016 | G6 208 | G7 214 | G8 211 | +1.5 | |||||
| Math · started 6th in 2017 | G6 201 | G7 229 | G8 218 | +8.8 | |||||
| Math · started 6th in 2018 | G6 225 | G7 212 | -13.0 | ||||||
| Math · started 6th in 2019 | G6 209 | — | |||||||
| Math · started 8th in 2022 | G8 153 | — | |||||||
| Math · started 7th in 2022 | G7 183 | G8 151 | -31.9 | ||||||
| Math · started 6th in 2022 | G6 161 | G7 165 | G8 146 | -7.4 | |||||
| Math · started 6th in 2023 | G6 174 | G7 165 | -9.0 | ||||||
| Math · started 6th in 2024 | G6 161 | — |
How this works: we follow each grade-cohort across years through the school (3rd graders in 2023 are 4th graders in 2024, etc.) and fit a linear slope on a 100–400 proficiency-points scale built from the state assessment's four levels (L1=1, L2=2, L3=3, L4=4, weighted by student share). This is the same construction Stanford SEDA uses (edopportunity.org/methods); it's not student-level tracking — we measure the school's cohort, not individuals. See the methodology page for thresholds.
Evidence & technical detailClick to expand
School Alpha
School Alpha is the residual between actual and expected performance once school context is held constant. It is a context-adjusted estimate, not a causal claim about teaching quality. Its reliability shows up on the page as the confidence label and the rank interval, not as a standalone statistic.
SES index components
- SES method
- Blended SES index (ACS + FRL)
- SES index value
- 62.1
- FRL %
- 69.2%
- ELL %
- 24.0% · OR ODE At-A-Glance (Ever English Learners)
- SPED %
- 19.0% · OR ODE At-A-Glance
- Tract median income (ACS 5-year)
- $96,944
- Tract poverty rate
- 8.0%
- Tract % bachelor's+
- 45.1%
What "Decoded Rank" means
Decoded Rank converts School Alpha — the context-adjusted residual — into a parent-facing rank within the metro pool. A higher Decoded Rank than Achievement Rank means the school's raw scores understate its performance once neighborhood and school context are held constant. The reverse means raw scores overstate it. The rank is one signal, not a verdict.