Gallatin County 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 Gallatin County Area, Montana.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Area not surveyed, access denied | 25K | Not rated | Not rated | ||
| Amsterdam-Quagle silt loams, 4 to 8 percent slopes | 17K | Well drained | C | Not limited | Somewhat limited |
| Brocko silt loam, 0 to 4 percent slopes | 15K | Well drained | B | Not limited | Somewhat limited |
| Brocko silt loam, 4 to 8 percent slopes | 15K | Well drained | B | Not limited | Somewhat limited |
| Amesha loam, 0 to 4 percent slopes | 11K | Well drained | B | Not limited | Somewhat limited |
| Crago-Pensore-Rock outcrop complex, 15 to 45 percent slopes | 9K | Well drained | B | Very limited | Very limited |
| Bandy-Riverwash-Bonebasin complex, 0 to 2 percent slopes | 9K | Poorly drained | B/D | Very limited | Very limited |
| Quagle-Brodyk silt loams, 4 to 8 percent slopes | 8K | Well drained | B | Not limited | Somewhat limited |
| Amesha loam, 4 to 8 percent slopes | 8K | Well drained | B | Not limited | Somewhat limited |
| Bacbuster-Wilsall-Castner complex, 15 to 45 percent slopes | 8K | Well drained | D | Very limited | Very limited |
| Hyalite-Beaverton complex, 0 to 4 percent slopes | 8K | Well drained | C | Somewhat limited | Very limited |
| Amsterdam silt loam, 0 to 4 percent slopes | 8K | Well drained | C | Not limited | Somewhat limited |
| Beaverell-Beavwan complex, 0 to 2 percent slopes | 8K | Well drained | B | Somewhat limited | Very limited |
| Brocko silt loam, 8 to 15 percent slopes | 8K | Well drained | B | Somewhat limited | Somewhat limited |
| Cabbart-Amesha-Trimad complex, 15 to 45 percent slopes | 8K | Well drained | D | Very limited | Very limited |
| Blackdog silt loam, 0 to 4 percent slopes | 7K | Well drained | C | Not limited | Somewhat limited |
| Bangtail-Copenhaver complex, 8 to 25 percent slopes | 7K | Well drained | C | Very limited | Very limited |
| Amsterdam-Quagle silt loams, 0 to 4 percent slopes | 7K | Well drained | C | Not limited | Somewhat limited |
| Bacbuster-Wilsall-Castner complex, 4 to 15 percent slopes | 7K | Well drained | D | Somewhat limited | Very limited |
| Threeriv-Bonebasin loams, 0 to 2 percent slopes | 7K | Very poorly drained | C/D | Very limited | Very limited |
What This Means
Building & Foundations
About 24% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 35% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.
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.