Winneshiek County, Iowa

Survey Area IA191 Iowa

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 Winneshiek County, Iowa.

Soil Map UnitAcresDrainageHydro GroupDwellingsSeptic
Downs silt loam, 5 to 9 percent slopes, moderately eroded 45K Well drainedCSomewhat limitedVery limited
Fayette silt loam, 5 to 9 percent slopes, moderately eroded 43K Well drainedCSomewhat limitedVery limited
Fayette silt loam, 9 to 14 percent slopes, moderately eroded 42K Well drainedCSomewhat limitedVery limited
Downs silt loam, 2 to 6 percent slopes 19K Well drainedCSomewhat limitedVery limited
Downs silt loam, 9 to 14 percent slopes, moderately eroded 18K Well drainedCSomewhat limitedVery limited
Lacrescent cobbly silty clay loam, 18 to 45 percent slopes 18K Well drainedCVery limitedVery limited
Fayette silt loam, 14 to 18 percent slopes, moderately eroded 17K Well drainedCVery limitedVery limited
Otter-Worthen complex, 1 to 4 percent slopes 11K Poorly drainedC/DVery limitedVery limited
Racine loam, 2 to 5 percent slopes 10K Well drainedCNot limitedVery limited
Ion-Eitzen complex, 0 to 2 percent slopes, occasionally flooded 10K Moderately well drainedBVery limitedVery limited
Winneshiek loam, 2 to 5 percent slopes 10K Well drainedCVery limitedVery limited
Fayette silt loam, 2 to 6 percent slopes 10K Well drainedCSomewhat limitedVery limited
Floyd loam, 1 to 4 percent slopes 10K Somewhat poorly drainedB/DVery limitedVery limited
Lawson-Ossian complex, 0 to 4 percent slopes 10K Somewhat poorly drainedB/DVery limitedVery limited
Kasson loam, 2 to 5 percent slopes 10K Moderately well drainedCVery limitedVery limited
Dubuque silt loam, 14 to 18 percent slopes, moderately eroded 9K Well drainedCVery limitedVery limited
Nordness silt loam, 14 to 40 percent slopes 6K Well drainedDVery limitedVery limited
Clyde silt loam, 0 to 3 percent slopes 6K Poorly drainedC/DVery limitedVery limited
Tama-Downs complex, driftless, 2 to 6 percent slopes 5K Well drainedCSomewhat limitedVery limited
Waukee loam, 0 to 2 percent slopes 5K Well drainedBNot limitedVery limited

What This Means

Building & Foundations

About 37% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

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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