Clark County Area, Idaho, Parts of Clark and Butte Counties
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 Clark County Area, Idaho, Parts of Clark and Butte Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Vadnais-Chickenridge-Rock outcrop complex, 1 to 12 percent slopes | 45K | Well drained | B | Very limited | Very limited |
| Jacoby-Vickton-Eaglecone complex, 1 to 8 percent slopes | 31K | Well drained | A | Somewhat limited | Very limited |
| Malm-Matheson-Rock outcrop complex, 1 to 12 percent slopes | 25K | Well drained | B | Very limited | Very limited |
| Coffee-Rock outcrop complex, 1 to 12 percent slopes | 16K | Well drained | C | Somewhat limited | Very limited |
| Whiteknob-Medicine complex, 0 to 2 percent slopes | 16K | Somewhat excessively drained | A | Not limited | Very limited |
| Grassyridge-Malm complex, 1 to 15 percent slopes | 15K | Somewhat excessively drained | A | Not limited | Very limited |
| Chickenridge-Stoneman complex, 1 to 12 percent slopes | 14K | Well drained | B | Somewhat limited | Very limited |
| Maremma-Pyrenees, stony-Akbash complex, 0 to 12 percent slopes | 14K | Well drained | B | Very limited | Very limited |
| Idmonton-Kilgore-Alex complex, 0 to 4 percent slopes | 14K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Eaglecone-Jacoby-Blacknoll complex, 1 to 6 percent slopes | 13K | Well drained | A | Very limited | Very limited |
| Jacoby-Kuvasz-St. Anthony complex, 1 to 8 percent slopes | 13K | Well drained | A | Not limited | Very limited |
| Chickenridge-Stoneman-Vadnais complex, 1 to 12 percent slopes | 13K | Well drained | B | Somewhat limited | Very limited |
| Simeroi gravelly silt loam, 1 to 5 percent slopes | 12K | Well drained | B | Not limited | Somewhat limited |
| Blacknoll-Jipper complex, 0 to 8 percent slopes | 11K | Well drained | B | Very limited | Very limited |
| Medicine silt loam, 0 to 2 percent slopes | 11K | Well drained | B | Not limited | Somewhat limited |
| Fallert gravelly loam, 0 to 2 percent slopes | 11K | Well drained | D | Not limited | Not limited |
| Malm-Bondfarm-Matheson complex, 1 to 12 percent slopes | 11K | Well drained | B | Very limited | Very limited |
| St. Anthony gravelly loam, 1 to 5 percent slopes | 11K | Well drained | C | Not limited | Very limited |
| Zeebar-Windicreek-Poso complex, 20 to 70 percent slopes | 11K | Well drained | A | Very limited | Very limited |
| Becreek-Grassyridge complex, 0 to 2 percent slopes | 11K | Well drained | A | Not limited | Very limited |
What This Means
Building & Foundations
About 45% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 89% 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
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.