Stephenson County, Illinois

Survey Area IL177 Illinois

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 Stephenson County, Illinois.

Soil Map UnitAcresDrainageHydro GroupDwellingsSeptic
Osco silt loam, 2 to 5 percent slopes 31K Well drainedBSomewhat limitedSomewhat limited
Fayette silt loam, glaciated, 5 to 10 percent slopes, eroded 18K Well drainedBSomewhat limitedSomewhat limited
Radford silt loam, 0 to 2 percent slopes, occasionally flooded 15K Somewhat poorly drainedB/DVery limitedVery limited
Greenbush silt loam, 2 to 5 percent slopes 14K Well drainedBSomewhat limitedSomewhat limited
Lawson silt loam, cool mesic, 0 to 2 percent slopes, occasionally flooded 14K Somewhat poorly drainedB/DVery limitedVery limited
Dodgeville silt loam, 5 to 10 percent slopes, eroded 13K Well drainedCVery limitedVery limited
Hitt silt loam, 5 to 10 percent slopes, eroded 11K Well drainedCSomewhat limitedVery limited
Dubuque silt loam, 5 to 10 percent slopes, moderately eroded 8K Well drainedCVery limitedVery limited
Woodbine silt loam, 5 to 10 percent slopes, eroded 8K Well drainedBSomewhat limitedVery limited
Osco silt loam, 5 to 10 percent slopes 8K Well drainedBSomewhat limitedSomewhat limited
Fayette silt loam, glaciated, 2 to 5 percent slopes 8K Well drainedBSomewhat limitedSomewhat limited
Ogle silt loam, 5 to 10 percent slopes, eroded 7K Well drainedBSomewhat limitedSomewhat limited
Greenbush silt loam, 5 to 10 percent slopes 7K Well drainedBSomewhat limitedSomewhat limited
Dorchester silt loam, 0 to 2 percent slopes, occasionally flooded 6K Well drainedBVery limitedVery limited
Muscatune silt loam, 0 to 2 percent slopes 6K Somewhat poorly drainedB/DVery limitedVery limited
Ashdale silt loam, 5 to 10 percent slopes, eroded 6K Well drainedBSomewhat limitedVery limited
Plano silt loam, 2 to 5 percent slopes 6K Well drainedBSomewhat limitedVery limited
Ogle silt loam, 2 to 5 percent slopes 6K Well drainedBSomewhat limitedSomewhat limited
Oneco silt loam, 5 to 10 percent slopes, eroded 5K Well drainedCSomewhat limitedVery limited
Osco silt loam, 5 to 10 percent slopes, eroded 5K Well drainedBSomewhat limitedSomewhat limited

What This Means

Building & Foundations

About 30% 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.

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