St. Louis County and St. Louis City, Missouri

Survey Area MO189• Missouri

The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Alfisols — moderately leached forest soils with a clay-enriched subsoil. 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. Louis County and St. Louis City, Missouri. 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
Urban land-Harvester complex, 2 to 9 percent slopes	74K			Not rated	Not rated
Urban land-Harvester complex, 9 to 20 percent slopes	35K			Not rated	Not rated
Urban land, upland, 0 to 5 percent slopes	21K			Not rated	Not rated
Urban land-Harvester complex, karst, 2 to 9 percent slopes	17K	Moderately well drained	C	Somewhat limited	Very limited
Menfro silt loam, 20 to 45 percent slopes	16K	Well drained	C	Very limited	Very limited
Water	12K	Subaqueous		Not rated	Not rated
Fishpot-Urban land-Freeburg complex, 0 to 2 percent slopes, frequently flooded	12K	Somewhat poorly drained	C	Very limited	Very limited
Urban land-Harvester complex, 0 to 2 percent slopes	10K			Not rated	Not rated
Gasconade-Rock outcrop complex, 15 to 50 percent slopes, rubbly	10K	Somewhat excessively drained	D	Very limited	Very limited
Goss very gravelly silt loam, 14 to 45 percent slopes	9K	Well drained	C	Very limited	Very limited
Menfro silt loam, 9 to 14 percent slopes, eroded	9K	Well drained	B	Somewhat limited	Somewhat limited
Urban land-Fishpot complex, 0 to 2 percent slopes, occasionally flooded	8K			Not rated	Not rated
Menfro silt loam, 14 to 20 percent slopes, eroded	8K	Well drained	C	Very limited	Very limited
Peers silty clay loam, 0 to 2 percent slopes, occasionally flooded	8K	Somewhat poorly drained	C/D	Very limited	Very limited
Haynie-Treloar-Blake complex, 0 to 2 percent slopes, frequently flooded	8K	Well drained	B	Very limited	Very limited
Winfield-Urban land complex, 5 to 9 percent slopes	7K	Moderately well drained	C	Somewhat limited	Very limited
Nevin-Urban land complex, 0 to 2 percent slopes	7K	Somewhat poorly drained	C/D	Very limited	Very limited
Winfield silt loam, 9 to 14 percent slopes, eroded	7K	Moderately well drained	C	Somewhat limited	Very limited
Menfro silt loam, 5 to 9 percent slopes, eroded	6K	Well drained	C	Somewhat limited	Very limited
Crider-Menfro silt loams, 14 to 30 percent slopes	5K	Well drained	C	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.

Alfisols

Moderately weathered forest soils with clay-enriched subsoil. Productive for agriculture, generally good for building and septic.

Entisols

Young soils with little development — found on floodplains, dunes, and steep slopes. Properties vary widely by setting.

Inceptisols

Young but developing soils found in mountains and river terraces. Variable properties — check drainage and bedrock depth.

Mollisols

Fertile grassland soils with thick, dark topsoil. Among the best for agriculture, building, and gardening.

What This Means

Building & Foundations

About 28% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

Septic Systems

About 41% 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.