Bob Marshall, Scapegoat, Great Bear, and Mission Mtn. Wilderness Area, Montana
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). 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 Bob Marshall, Scapegoat, Great Bear, and Mission Mtn. Wilderness Area, Montana.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Nooney, very stony-Lonniebee family-Rock outcrop complex, 35 to 60 percent slopes | 196K | Well drained | A | Very limited | Very limited |
| Risingwolf-Nooney, stony-Lonniebee family complex, 35 to 60 percent slopes | 182K | Well drained | B | Very limited | Very limited |
| Risingwolf-Sherlock family-Kegsprings family, stony complex, 35 to 60 percent slopes | 137K | Well drained | B | Very limited | Very limited |
| Risingwolf-Sherlock family-Boatman family, very stony complex, 8 to 35 percent slopes | 110K | Well drained | B | Very limited | Very limited |
| Rubble land-Rock outcrop-Skaggs family, very stony complex, 35 to 60 percent slopes | 96K | A | Not rated | Not rated | |
| Kegsprings family, very stony-Worock-Risingwolf complex, 35 to 60 percent slopes | 89K | Well drained | B | Very limited | Very limited |
| Skaggs family, very stony-Helmville family, stony-Rock outcrop complex, 35 to 60 percent slopes | 77K | Well drained | C | Very limited | Very limited |
| Risingwolf-Sherlock-Helmville families, complex, 35 to 60 percent slopes | 76K | Well drained | B | Very limited | Very limited |
| Risingwolf family, stony-Helmville family-Skaggs family, stony complex, 35 to 60 percent slopes | 65K | Well drained | C | Very limited | Very limited |
| Whitore family-Helmville family, stony complex, 35 to 60 percent slopes | 60K | Well drained | B | Very limited | Very limited |
| Helmville family-Skaggs family, stony-Tropal family, very stony complex, 8 to 35 percent slopes | 59K | Well drained | C | Very limited | Very limited |
| Worock-Mikesell-Lonniebee families, complex, 35 to 60 percent slopes | 28K | Well drained | C | Very limited | Very limited |
| Worock-Jaegie-Mikesell families, complex, 35 to 60 percent slopes | 27K | Well drained | C | Very limited | Very limited |
| Risingwolf-Pippin family complex, 0 to 35 percent slopes | 26K | Well drained | B | Very limited | Very limited |
| Nooney family, very bouldery-Rubble land-Rock outcrop complex, 60 to 80 percent slopes | 23K | Well drained | A | Very limited | Very limited |
| Rubble land-Rock outcrop-Starman family, very rubbly complex, 20 to 70 percent slopes | 22K | D | Not rated | Not rated | |
| Mikesell-Helmville-Northorn families, complex, 2 to 15 percent slopes | 20K | Well drained | C | Not limited | Very limited |
| Kegsprings family-Risingwolf-Sherlock family complex, 0 to 15 percent slopes | 20K | Well drained | B | Not limited | Very limited |
| Parkcity-Pippin families, complex, 0 to 8 percent slopes | 19K | Well drained | B | Not limited | Very limited |
| Charpeak family, very stony-Poso family-Rubble land complex, 35 to 60 percent slopes | 18K | Well drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 86% 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 91% 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.