Harrison County, Iowa
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). 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 Harrison County, Iowa. 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 |
|---|---|---|---|---|---|
| Ida silt loam, 14 to 20 percent slopes, severely eroded | 39K | Well drained | B | Very limited | Very limited |
| Napier silt loam, 5 to 9 percent slopes | 36K | Well drained | B | Not limited | Somewhat limited |
| Napier silt loam, 2 to 5 percent slopes | 33K | Well drained | B | Not limited | Somewhat limited |
| Monona silt loam, 9 to 14 percent slopes, eroded | 25K | Well drained | B | Somewhat limited | Somewhat limited |
| Monona silt loam, 5 to 9 percent slopes, eroded | 20K | Well drained | B | Not limited | Somewhat limited |
| Monona silt loam, 2 to 5 percent slopes | 18K | Well drained | B | Not limited | Somewhat limited |
| Ida silt loam, 9 to 14 percent slopes, severely eroded | 18K | Well drained | B | Somewhat limited | Somewhat limited |
| Luton silty clay, thin surface | 16K | Poorly drained | D | Very limited | Very limited |
| Albaton silty clay, 0 to 2 percent slopes, occasionally flooded | 16K | Poorly drained | D | Very limited | Very limited |
| Monona silt loam, 5 to 9 percent slopes | 15K | Well drained | B | Not limited | Somewhat limited |
| Ida silt loam, 20 to 30 percent slopes, severely eroded | 13K | Well drained | B | Very limited | Very limited |
| McPaul silt loam | 13K | Well drained | B | Very limited | Very limited |
| Luton silty clay | 11K | Poorly drained | D | Very limited | Very limited |
| Dockery-Quiver silt loams, deep loess, 0 to 2 percent slopes, occasionally flooded | 10K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Monona silt loam, 14 to 20 percent slopes, eroded | 10K | Well drained | B | Very limited | Very limited |
| Haynie silt loam, 0 to 2 percent slopes, occasionally flooded | 10K | Moderately well drained | B | Very limited | Very limited |
| Kennebec silt loam, 0 to 2 percent slopes, occasionally flooded, overwash | 9K | Moderately well drained | B | Very limited | Very limited |
| Kennebec silt loam, 0 to 2 percent slopes, occasionally flooded | 9K | Moderately well drained | B | Very limited | Very limited |
| Napier silt loam, 9 to 14 percent slopes | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| Hamburg silt loam, 40 to 75 percent slopes | 6K | Somewhat excessively drained | B | 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 48% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 48% 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.