Caribou National Forest, Idaho and Wyoming
The most common soil here is Davtone, on about 5% of the land: a loam, a balanced mix that crumbles in your hand. Kingmine and Broad Canyon come next.
About 98% of the land drains well.
USDA rates 99% of the land very limited for a standard septic drain field, and 96% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: bedrock lies within 40 inches under 49% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Caribou National Forest, Idaho and Wyoming, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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 Caribou National Forest, Idaho and Wyoming. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Valmar-Warshod family, extremely stony surface-Foxol, very stony surface, complex, 30 to 60 percent slopes | 21K | Well drained | C | Very limited | Very limited |
| Gralic, very stony surface-Kingmine-Sponsor families, complex, 25 to 55 percent slopes | 20K | Well drained | B | Very limited | Very limited |
| Primeaux-Goodski-Skutum families, complex, 20 to 50 percent slopes | 18K | Well drained | C | Very limited | Very limited |
| Starley, very stony surface-Karlan-Parkcity families, complex, 40 to 75 percent slopes | 16K | Well drained | B | Very limited | Very limited |
| Middlehill family, very stony surface-Dranburn-Parkcity family, complex, 30 to 70 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Spearhead family-Broad Canyon, very stony surface, complex, 40 to 70 percent slopes, MLRA 47 | 13K | Well drained | B | Very limited | Very limited |
| Toponce-Mikesell-Beaverdam family, complex, 15 to 45 percent slopes | 12K | Well drained | C | Very limited | Very limited |
| Stringam-Wayan family, complex, 22 to 50 percent slopes | 12K | Well drained | C | Very limited | Very limited |
| Spearhead family-Spearhead family, warm-Booneville complex, 30 to 60 percent slopes | 12K | Well drained | B | Very limited | Very limited |
| Bachus-Burnette family-Ticanot, very stony surface, complex, 15 to 50 percent slopes | 11K | Well drained | C | Very limited | Very limited |
| Davtone-Sedgway-Woodhurst families, complex, 20 to 45 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Ireland, extremely stony surface-Drage family, complex, 35 to 65 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Davtone-Ezbin families, complex, 20 to 50 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Beaverdam-Davtone-Faim families, complex, 10 to 40 percent slopes | 9K | Well drained | C | Very limited | Very limited |
| Sparky-Jedediah family, complex, 10 to 60 percent slopes, MLRA 13 | 9K | Well drained | B | Very limited | Very limited |
| Povey-Chokecherry complex, 30 to 60 percent slopes | 9K | Well drained | B | Very limited | Very limited |
| Hourglass family-Bischoff-Davtone family, complex, 20 to 50 percent slopes | 9K | Well drained | C | Very limited | Very limited |
| Cluff, bouldery surface-Groomer-Cluff, bouldery surface cold, families, complex, 10 to 30 percent slopes | 8K | Moderately well drained | C | Very limited | Very limited |
| Farlow family, very stony surface-Ireland, extremely stony surface, complex, 30 to 65 percent slopes | 8K | Well drained | B | Very limited | Very limited |
| Bischoff-Sessions families, complex, 15 to 50 percent slopes | 8K | Well drained | C | Very limited | Very limited |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 96% 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 99% 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.