Soil series profile
Seventeenmile soil series
Seventeenmile is a well drained soil with a silt loam surface, mapped on 743,296 acres in 1 county in AK. Hydrologic group B.
- Drainage class
- Well drained 100% of mapped acres
- Hydrologic group
- B 100% of mapped acres
- Typical topsoil pH
- 6.0 moderately acidic · range 6.0–6.5
- Mapped area
- 743k acres in 1 county, 1 state
Typical Seventeenmile profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–2 in (Oe) | Moderately decomposed plant material | 6.0 | 0% | 0% | 75% |
| 2–5 in (A/Bw) | Silt loam | 6.0 | 16% | 18% | 6% |
| 5–13 in (Bw) | Silt loam | 7.0 | 16% | 16% | 1.5% |
| 13–35 in (BC) | Fine sandy loam | 7.5 | 7% | 55% | 1.5% |
| 35–51 in (2C1) | Loamy sand | 8.0 | 2% | 80% | 0.25% |
| 51–59 in (3C2) | Gravelly sand | 8.0 | 1% | 94% | 0.25% |
What this means
What Seventeenmile soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Seventeenmile soils is moderately acidic: pH 6.0 (most land between 6.0 and 6.5). 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 Seventeenmile acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (100% of mapped Seventeenmile acres).
100% of mapped Seventeenmile acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
Most land is in hydrologic groups B and C, where rain soaks in at a moderate pace.
For a septic system
For conventional septic absorption fields, NRCS rates 100% of the acres in mapped Seventeenmile 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 Seventeenmile soil is found
Mapped acres
Seventeenmile is mapped in Alaska.
| County | Acres | Share of county land |
|---|---|---|
| Yukon-Koyukuk Census Area, AK | 743,296 | 1.4% |
Septic absorption fields
NRCS rating, share of Seventeenmile 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 Seventeenmile 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 1–1% (median 1%).
- Topsoil organic matter
- Median 6%.
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 | 100.0% |
| C: slow infiltration | 0.0% |
| 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 Seventeenmile (component kind "Series") in SSURGO: 743,296 acres.
- Method
- Shares are by mapped acres of Seventeenmile components. The profile comes from the single largest Seventeenmile component. Full methodology.