Iowa County, Wisconsin

Survey Area WI049 Wisconsin

The dominant drainage class is 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 Iowa County, Wisconsin.

Soil Map UnitAcresDrainageHydro GroupDwellingsSeptic
Newglarus silt loam, moderately deep, 12 to 20 percent slopes, moderately eroded 41K Well drainedCVery limitedVery limited
Dorerton, very stony-Elbaville complex, 30 to 60 percent slopes 25K Well drainedBVery limitedVery limited
Dodgeville silt loam, deep, 2 to 6 percent slopes, moderately eroded 23K Well drainedCSomewhat limitedVery limited
Palsgrove silt loam, 6 to 12 percent slopes, moderately eroded 23K Well drainedBSomewhat limitedVery limited
Newglarus silt loam, moderately deep, 6 to 12 percent slopes, moderately eroded 22K Well drainedCVery limitedVery limited
Newglarus silt loam, deep, 12 to 20 percent slopes, moderately eroded 18K Well drainedCVery limitedVery limited
Dodgeville silt loam, deep, 6 to 12 percent slopes, moderately eroded 17K Well drainedCSomewhat limitedVery limited
Dodgeville silt loam, 6 to 12 percent slopes, moderately eroded 17K Well drainedCVery limitedVery limited
Elkmound-Northfield complex, 30 to 60 percent slopes, very rocky 14K Well drainedDVery limitedVery limited
Lacrescent-Dunbarton complex, very stony, 30 to 60 percent slopes 13K Well drainedBVery limitedVery limited
Palsgrove silt loam, 12 to 20 percent slopes, moderately eroded 12K Well drainedBVery limitedVery limited
Palsgrove silt loam, 2 to 6 percent slopes, moderately eroded 11K Well drainedBSomewhat limitedVery limited
Sogn and Dodgeville silt loams, shallow, 12 to 20 percent slopes, moderately eroded 10K Somewhat excessively drainedDVery limitedVery limited
Orion silt loam, 0 to 3 percent slopes, occasionally flooded 9K Somewhat poorly drainedB/DVery limitedVery limited
Dodgeville silt loam, 12 to 20 percent slopes, moderately eroded 9K Well drainedCVery limitedVery limited
Gale silt loam, 12 to 20 percent slopes, moderately eroded 9K Well drainedCVery limitedVery limited
Elbaville silt loam, 20 to 30 percent slopes, moderately eroded 8K Well drainedCVery limitedVery limited
Pepin silt loam, 12 to 20 percent slopes, moderately eroded 8K Well drainedBVery limitedVery limited
Tama silt loam, driftless, 2 to 6 percent slopes, moderately eroded 8K Well drainedCSomewhat limitedVery limited
Gaphill-Rockbluff complex, 30 to 60 percent slopes 8K Well drainedAVery limitedVery limited

What This Means

Building & Foundations

About 73% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 100% 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.

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