Middle Fork Payette River Area, Idaho, Parts of Valley and Boise Counties
The dominant drainage class is Well drained and the dominant hydrologic group is A (high infiltration, low 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 Middle Fork Payette River Area, Idaho, Parts of Valley and Boise Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Quartzburg-Coski complex, 25 to 70 percent slopes | 29K | Somewhat excessively drained | A | Very limited | Very limited |
| Pyle-Koppes complex, 40 to 60 percent slopes | 24K | Somewhat excessively drained | A | Very limited | Very limited |
| Koppes-Scriver complex, 40 to 60 percent slopes | 21K | Well drained | A | Very limited | Very limited |
| Koppes-Quartzburg gravelly loamy coarse sands, 40 to 60 percent slopes | 20K | Well drained | A | Very limited | Very limited |
| Koppes-Toiyabe gravelly loamy coarse sands, 40 to 60 percent slopes | 20K | Well drained | A | Very limited | Very limited |
| Bryan-Pyle complex, 40 to 60 percent slopes | 18K | Excessively drained | A | Very limited | Very limited |
| Coski complex, 40 to 60 percent slopes | 17K | Well drained | A | Very limited | Very limited |
| Pyle-Quartzburg complex, 40 to 60 percent slopes | 11K | Somewhat excessively drained | A | Very limited | Very limited |
| Graylock-Whitecap complex, 40 to 60 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Hanks-Bryan gravelly coarse sandy loams, 40 to 60 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Scriver-Bryan complex, 40 to 60 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Hanks-Josie gravelly coarse sandy loams, 40 to 60 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Graylock complex, 40 to 60 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Josie gravelly coarse sandy loam, 40 to 60 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Pyle-Ligget complex, 40 to 60 percent slopes | 6K | Somewhat excessively drained | A | Very limited | Very limited |
| Hanks gravelly coarse sandy loam, 20 to 40 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Coski-Scriver complex, 20 to 40 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Koppes-Whitecap gravelly loamy coarse sands, 20 to 40 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Koppes-Josie complex, 40 to 60 percent slopes | 5K | Well drained | A | Very limited | Very limited |
| Pyle-Scriver complex, 20 to 40 percent slopes | 5K | Somewhat excessively drained | A | Very limited | Very limited |
What This Means
Building & Foundations
About 100% 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 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.