Grant County Area, Oregon
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high 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 Grant County Area, Oregon.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Gwin-Rockly-Rock outcrop complex, 20 to 50 percent south slopes | 35K | Well drained | D | Very limited | Very limited |
| Merlin-Canest-Zumwalt complex, MLRA 9, 2 to 20 percent slopes | 25K | Well drained | D | Very limited | Very limited |
| Keerins channery loam, 15 to 65 percent south slopes | 22K | Well drained | D | Very limited | Very limited |
| Gwin-Rockly-Rock outcrop complex, 2 to 20 percent slopes | 21K | Well drained | D | Very limited | Very limited |
| Bocker-Parsnip-Raycreek complex, 2 to 20 percent slopes | 19K | Well drained | D | Very limited | Very limited |
| Devnot-Coelho-Elderflat complex, 2 to 20 percent slopes | 19K | Well drained | D | Very limited | Very limited |
| Hutchley-Kishwalk-Finsel complex, 20 to 50 percent slopes | 18K | Well drained | D | Very limited | Very limited |
| Gwinly-Devnot complex, 2 to 20 percent slopes | 18K | Well drained | D | Very limited | Very limited |
| Klicker-Fivebit-Bocker complex, 2 to 20 percent slopes | 16K | Well drained | D | Very limited | Very limited |
| Gwin-Rockly-Rock outcrop complex, 50 to 90 percent south slopes | 14K | Well drained | D | Very limited | Very limited |
| Gwinly-Kishwalk-Rock outcrop complex, 20 to 50 percent south slopes | 14K | Well drained | D | Very limited | Very limited |
| Keerins-Izee complex, 15 to 65 percent north slopes | 13K | Well drained | D | Very limited | Very limited |
| Finsel-Camool complex, 20 to 50 percent north slopes | 13K | Well drained | D | Very limited | Very limited |
| Keerins-Logdell complex, 15 to 65 percent south slopes | 13K | Well drained | D | Very limited | Very limited |
| Silvies-Gerow-Luckybutte, occasionally flooded complex, 0 to 2 percent slopes | 12K | Poorly drained | C/D | Very limited | Very limited |
| Exfo-Rock outcrop-Ninetysix complex, 20 to 50 percent south slopes | 12K | Well drained | D | Very limited | Very limited |
| Silvies-Gerow complex, 1 to 12 percent slopes | 12K | Poorly drained | C/D | Very limited | Very limited |
| Rockly-Elderflat complex, 2 to 20 percent slopes | 11K | Well drained | D | Very limited | Very limited |
| Hack-Rockly-Watama complex, 2 to 20 percent slopes | 11K | Well drained | C | Somewhat limited | Very limited |
| Meaufun-Alding-Gaib complex, 2 to 20 percent slopes | 10K | Well drained | C | 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, poor drainage in some areas. A geotechnical assessment is recommended before building.
Septic Systems
About 100% 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.