Wibaux County, Montana

Survey Area MT109• Montana

The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high runoff). The most common soil order is Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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 Wibaux County, Montana. 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
Bainville-Chama silt loams, 15 to 30 percent slopes	48K	Well drained	D	Very limited	Very limited
Rockland-Bainville complex, 15 to 50 percent slopes	48K			Not rated	Not rated
Chama silt loam, 4 to 7 percent slopes	40K	Well drained	C	Somewhat limited	Very limited
Golva silt loam, 2 to 6 percent slopes	37K	Well drained	B	Not limited	Somewhat limited
Badland	24K			Not rated	Not rated
Chama-Bainville silt loams, 10 to 14 percent slopes	22K	Well drained	C	Somewhat limited	Very limited
Regent-Wyola silty clay loams, 3 to 6 percent slopes	20K	Well drained	C	Very limited	Very limited
Lonna-Cabbart silt loams, 6 to 35 percent slopes	18K	Well drained	B	Very limited	Somewhat limited
Golva silt loam, 0 to 2 percent slopes	16K	Well drained	B	Not limited	Somewhat limited
Bainville-Flasher complex, 15 to 40 percent slopes	16K	Well drained	D	Very limited	Very limited
Bainville-Wibaux complex, 15 to 40 percent slopes	16K	Well drained	D	Very limited	Very limited
Pierre-Lismas clays, 15 to 40 percent slopes	15K	Well drained	D	Very limited	Very limited
Alluvial land	14K	Well drained	B	Very limited	Very limited
Midway-Moreau complex, 12 to 30 percent slopes	14K	Well drained	D	Very limited	Very limited
Badland, 9 to 150 percent slopes	11K			Very limited	Very limited
Midway-Regent silty clay loams, 3 to 7 percent slopes	10K	Well drained	D	Very limited	Very limited
Lismas clay-Shale outcrop, 20 to 60 percent slopes	10K	Well drained	D	Very limited	Very limited
Korell loam, 0 to 2 percent slopes, rarely flooded	8K	Well drained	C	Very limited	Very limited
Chama-Cabba-Sen silt loams, 6 to 9 percent slopes	8K	Well drained	C	Somewhat limited	Very limited
Korchea-Fluvaquents complex, channeled, 0 to 2 percent slopes, frequently flooded	8K	Somewhat poorly 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.

Mollisols

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

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.

Aridisols

Dry-climate soils with low organic matter. Often have caliche layers that make excavation difficult. Low shrink-swell is good for foundations.

What This Means

Building & Foundations

About 51% 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 64% 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.