Guthrie County, Iowa
The dominant drainage class is Moderately well drained and the dominant hydrologic group is C (slow infiltration, moderate 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 Guthrie County, Iowa.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Sharpsburg silty clay loam, 5 to 9 percent slopes, eroded | 37K | Moderately well drained | C | Somewhat limited | Very limited |
| Sharpsburg silty clay loam, 9 to 14 percent slopes, eroded | 24K | Moderately well drained | C | Somewhat limited | Very limited |
| Clarion loam, Bemis moraine, 2 to 6 percent slopes | 24K | Well drained | B | Somewhat limited | Somewhat limited |
| Webster clay loam, Bemis moraine, 0 to 2 percent slopes | 19K | Poorly drained | C/D | Very limited | Very limited |
| Shelby clay loam, dissected till plain, 14 to 18 percent slopes, eroded | 15K | Well drained | C | Very limited | Very limited |
| Nicollet loam, 1 to 3 percent slopes | 15K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Colo-Judson silty clay loams, 0 to 5 percent slopes, occasionally flooded | 15K | Poorly drained | C/D | Very limited | Very limited |
| Ladoga silt loam, dissected till plain, 5 to 9 percent slopes, eroded | 15K | Moderately well drained | C | Very limited | Very limited |
| Gara loam, dissected till plain, 18 to 25 percent slopes, eroded | 14K | Well drained | C | Very limited | Very limited |
| Olmitz-Colo, occasionally flooded, complex, 0 to 5 percent slopes | 13K | Moderately well drained | C | Very limited | Very limited |
| Colo silt loam, deep loess, 0 to 2 percent slopes, overwash, occasionally flooded | 11K | Poorly drained | C/D | Very limited | Very limited |
| Ladoga silt loam, 9 to 14 percent slopes, eroded | 11K | Moderately well drained | C | Very limited | Very limited |
| Sharpsburg silty clay loam, 2 to 5 percent slopes | 11K | Moderately well drained | C | Somewhat limited | Very limited |
| Shelby clay loam, dissected till plain, 9 to 14 percent slopes, eroded | 9K | Well drained | C | Somewhat limited | Very limited |
| Gara loam, dissected till plain, 14 to 18 percent slopes, eroded | 9K | Well drained | C | Very limited | Very limited |
| Shelby-Adair clay loams, dissected till plain, 9 to 14 percent slopes, eroded | 8K | Well drained | C | Somewhat limited | Very limited |
| Canisteo clay loam, Bemis moraine, 0 to 2 percent slopes | 7K | Poorly drained | C/D | Very limited | Very limited |
| Shelby-Adair clay loams, dissected till plain, 14 to 18 percent slopes, eroded | 6K | Well drained | C | Very limited | Very limited |
| Marshall silty clay loam, 5 to 9 percent slopes, eroded | 5K | Well drained | C | Somewhat limited | Very limited |
| Gara-Armstrong loams, 14 to 18 percent slopes, moderately eroded | 5K | Well drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 56% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas, flood-prone areas. 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.