Umatilla National Forest, 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 Umatilla National Forest, Oregon.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| No Digital Data Available | 55K | Not rated | Not rated | ||
| Limberjim-Syrupcreek complex, 30 to 60 percent north slopes | 41K | Well drained | C | Very limited | Very limited |
| Limberjim-Syrupcreek complex, 0 to 15 percent slopes | 34K | Well drained | C | Somewhat limited | Very limited |
| Limberjim-Syrupcreek complex, 15 to 30 percent north slopes | 32K | Well drained | C | Very limited | Very limited |
| Syrupcreek-Limberjim-Larabee complex, 30 to 60 percent slopes | 23K | Well drained | C | Very limited | Very limited |
| Limberjim-Getaway-Rock outcrop complex, 60 to 90 percent north slopes | 19K | Well drained | C | Very limited | Very limited |
| Harl-Limberjim-Rock outcrop complex, 60 to 90 percent north slopes | 19K | Well drained | B | Very limited | Very limited |
| Troutmeadows-Mountemily complex, 0 to 15 percent slopes | 16K | Well drained | C | Very limited | Very limited |
| Larabee-Getaway-Anatone complex, 60 to 90 percent slopes | 15K | Well drained | C | Very limited | Very limited |
| Bocker-Anatone-Rock outcrop complex, 60 to 90 percent slopes | 15K | Well drained | D | Very limited | Very limited |
| Mountemily-Mountireland complex, 0 to 15 percent slopes | 13K | Well drained | C | Not limited | Very limited |
| Bocker-Anatone-Rock outcrop complex, 30 to 60 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Bocker-Parsnip complex, 0 to 15 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Gutridge-McWillar-Kingbolt complex, 30 to 60 percent slopes | 12K | Well drained | B | Very limited | Very limited |
| Syrupcreek-Limberjim complex, 0 to 15 percent slopes | 11K | Well drained | C | Very limited | Very limited |
| Gwin-Rock outcrop complex, 40 to 70 percent slopes | 11K | Well drained | D | Very limited | Very limited |
| Larabee-Klickson-Anatone complex, 30 to 60 percent slopes | 11K | Well drained | C | Very limited | Very limited |
| Analulu-McWillar-Kingbolt complex, 30 to 60 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Fivebeaver-Bocker complex, 0 to 15 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Klicker-Fivebit-Bocker complex, 0 to 15 percent slopes | 9K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 73% 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 85% 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.