Soil series profile
McCully soil series
McCully is a well drained soil with a clay loam surface, mapped on 72,598 acres in 3 counties in OR. Hydrologic group C.
- Drainage class
- Well drained 100% of mapped acres
- Hydrologic group
- C 100% of mapped acres
- Typical topsoil pH
- 5.3 strongly acidic · range 5.3–5.3
- Mapped area
- 73k acres in 3 counties, 1 state
Typical McCully profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–1 in (Oi) | Slightly decomposed plant material | 4.5 | 15% | 35% | 75% |
| 1–11 in (H1) | Clay loam | 5.3 | 35% | 33% | 8.5% |
| 11–58 in (H2) | Clay | 4.8 | 50% | 22% | 2.6% |
| 58–68 in (H3) | Weathered bedrock | Not reported | Not reported | Not reported | Not reported |
What this means
What McCully soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in McCully soils is strongly acidic: pH 5.3. Most vegetables and lawn grasses do best around 6.0 to 7.0, so lime is often needed; blueberries, azaleas and rhododendrons like it as it is.
Loamy topsoil (loam, silt loam and similar) covers 100% of mapped McCully acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is clay loam (87% of mapped McCully acres).
100% of mapped McCully 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 McCully 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 McCully soil is found
Mapped acres
McCully is mapped in Oregon.
| County | Acres | Share of county land |
|---|---|---|
| Marion County, OR | 51,184 | 10.2% |
| Lane County, OR | 16,635 | 1.1% |
| Clackamas County, OR | 4,778 | 0.9% |
Septic absorption fields
NRCS rating, share of McCully 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 McCully 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 10–60% (median 25%).
- Topsoil organic matter
- Median 8.5%.
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 McCully (component kind "Series") in SSURGO: 72,598 acres.
- Method
- Shares are by mapped acres of McCully components. The profile comes from the single largest McCully component. Full methodology.