Soil series profile
Alspaugh soil series
Alspaugh is a well drained soil with a clay loam surface, mapped on 32,526 acres in 2 counties in OR. Hydrologic group C.
- Drainage class
- Well drained 100% of mapped acres
- Hydrologic group
- C 100% of mapped acres
- Typical topsoil pH
- 5.8 moderately acidic · range 5.8–5.8
- Mapped area
- 33k acres in 2 counties, 1 state
Typical Alspaugh profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–14 in (H1) | Clay loam | 5.8 | 31% | 35% | 5% |
| 14–43 in (H2) | Clay | 5.0 | 40% | 30% | 1.75% |
| 43–60 in (H3) | Very gravelly clay | 5.0 | 40% | 30% | 0.25% |
What this means
What Alspaugh soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Alspaugh soils is moderately acidic: pH 5.8. Many vegetables grow well here, and some gardens benefit from a little lime. Test before adding any.
Loamy topsoil (loam, silt loam and similar) covers 100% of mapped Alspaugh acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is clay loam (100% of mapped Alspaugh acres).
100% of mapped Alspaugh acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
On 100% of mapped acres, rain soaks in slowly (hydrologic groups C and D, including dual groups that are D until drained). Expect runoff and puddles after heavy rain: core-aerate compacted lawns and keep ground sloping away from foundations.
For a septic system
For conventional septic absorption fields, NRCS rates 100% of the acres in mapped Alspaugh soils very limited, 0% somewhat limited and 0% not limited.
Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Alspaugh soil is found
Mapped acres
Alspaugh is mapped in Oregon.
| County | Acres | Share of county land |
|---|---|---|
| Clackamas County, OR | 32,526 | 5.8% |
| Marion County, OR | 1 | 0.0% |
Septic absorption fields
NRCS rating, share of Alspaugh acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 100.0% |
Drainage, water table and flooding
Share of Alspaugh acres
- Depth to seasonal high water table
- None reported within about 6.5 feet (median where reported).
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 5–23% (median 13%).
- Topsoil organic matter
- Median 5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 100.0% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 100.0% |
| D: very slow infiltration (clayey, shallow or wet) | 0.0% |
| A/D: D as is, A if drained | 0.0% |
| B/D: D as is, B if drained | 0.0% |
| C/D: D as is, C if drained | 0.0% |
Sources & data dates
- Source
- USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
- Data date
- SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
- Scope
- All map unit components named Alspaugh (component kind "Series") in SSURGO: 32,526 acres.
- Method
- Shares are by mapped acres of Alspaugh components. The profile comes from the single largest Alspaugh component. Full methodology.