Klamath National Forest Area, Parts of Siskiyou County, California, and Jackson County, Oregon
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Klamath National Forest Area, Parts of Siskiyou County, California, and Jackson County, Oregon.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Clallam, deep-Deadwood families association, 50 to 90 percent slopes. | 165K | Well drained | C | Very limited | Very limited |
| Deadwood-Clallam, deep families association, 50 to 90 percent slopes. | 127K | Well drained | D | Very limited | Very limited |
| Jayar-Woodseye families association, 30 to 70 percent slopes. | 68K | Well drained | C | Very limited | Very limited |
| Clallam, deep-Holland families association, 30 to 70 percent slopes. | 64K | Well drained | C | Very limited | Very limited |
| Woodseye-Jayar families association, 30 to 70 percent slopes. | 58K | Well drained | D | Very limited | Very limited |
| Clallam, deep-Goldridge, gravelly families association, 30 to 90 percent slopes. | 58K | Well drained | C | Very limited | Very limited |
| Gilligan-Goldridge families association, 30 to 90 percent slopes. | 56K | Somewhat excessively drained | A | Very limited | Very limited |
| Holland-Clallam, deep-Coboc families associations, 15 to 70 percent slopes. | 48K | Well drained | C | Very limited | Very limited |
| Gilligan-Chawanakee families association, 30 to 90 percent slopes. | 45K | Somewhat excessively drained | A | Very limited | Very limited |
| Sheld-Iller families complex, 5 to 50 percent slopes. | 44K | Well drained | B | Very limited | Very limited |
| Water | 41K | D | Not rated | Not rated | |
| Holland-Skalan families association, 30 to 70 percent slopes. | 41K | Well drained | C | Very limited | Very limited |
| Deadwood family-Rock outcrop association, 50 to 90 percent slopes. | 35K | Well drained | D | Very limited | Very limited |
| Gerle family-Entic Xerumbrepts association, 50 to 90 percent slopes. | 35K | Well drained | B | Very limited | Very limited |
| Woodseye family-Rock outcrop association, 50 to 90 percent slopes. | 33K | Well drained | D | Very limited | Very limited |
| Teewinot-Endlich families association, 50 to 90 percent slopes. | 32K | Excessively drained | D | Very limited | Very limited |
| Lithic ruptic-Xerochreptic haploxeralfs-Olete family association, 30 to 90 percent slopes. | 31K | Well drained | D | Very limited | Very limited |
| Avis-Oosen families complex, 15 to 50 percent slopes. | 27K | Somewhat excessively drained | A | Very limited | Very limited |
| Skalan family-Lithic Haploxeralfs association, 30 to 90 percent slopes. | 27K | Well drained | C | Very limited | Very limited |
| Entic Xerumbrepts-Gerle family association, 30 to 90 percent slopes. | 26K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 96% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes. A geotechnical assessment is recommended before building.
Septic Systems
About 96% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.