St. Francois County, Missouri

Survey Area MO187 Missouri

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 St. Francois County, Missouri.

Soil Map UnitAcresDrainageHydro GroupDwellingsSeptic
Goss very cobbly silt loam, 15 to 50 percent slopes, extremely stony 39K Well drainedDVery limitedVery limited
Hildebrecht silt loam, 3 to 8 percent slopes 23K Moderately well drainedC/DVery limitedVery limited
Caneyville silt loam, 3 to 8 percent slopes 18K Well drainedDVery limitedVery limited
Crider silt loam, 3 to 8 percent slopes 16K Well drainedBSomewhat limitedSomewhat limited
Fourche silt loam, 3 to 8 percent slopes 14K Moderately well drainedCVery limitedVery limited
Irondale gravelly silt loam, 15 to 35 percent slopes, rocky, extremely bouldery 14K Well drainedCVery limitedVery limited
Crider silt loam, 1 to 5 percent slopes 13K Well drainedBSomewhat limitedSomewhat limited
Caneyville silt loam, 8 to 15 percent slopes 10K Well drainedCVery limitedVery limited
Jonca silt loam, 3 to 8 percent slopes 9K Moderately well drainedCSomewhat limitedVery limited
Nicholson silt loam, 3 to 8 percent slopes 9K Moderately well drainedCVery limitedVery limited
Hassler-Syenite complex, 8 to 25 percent slopes, rocky, bouldery 9K Moderately well drainedCVery limitedVery limited
Delassus silt loam, 3 to 8 percent slopes 8K Moderately well drainedCVery limitedVery limited
Delassus silt loam, 1 to 5 percent slopes 7K Moderately well drainedCSomewhat limitedVery limited
Gasconade-Rock outcrop complex, 3 to 35 percent slopes 7K Somewhat excessively drainedDVery limitedVery limited
Haymond silt loam, 0 to 3 percent slopes, frequently flooded 6K Well drainedBVery limitedVery limited
Elsah silt loam, 1 to 3 percent slopes, frequently flooded 6K Somewhat excessively drainedBVery limitedVery limited
Jonca silt loam, 1 to 5 percent slopes 5K Moderately well drainedCSomewhat limitedVery limited
Delassus silt loam, 3 to 8 percent slopes, bouldery 5K Moderately well drainedCSomewhat limitedVery limited
Caneyville silt loam, 15 to 20 percent slopes, stony 5K Well drainedCVery limitedVery limited
Syenite silt loam, 8 to 25 percent slopes, extremely bouldery 5K Well drainedCVery limitedVery limited

What This Means

Building & Foundations

About 75% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 87% 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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