Coos County, Oregon

Survey Area OR011• Oregon

The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). The most common soil order is Inceptisols — young soils with minimal horizon development but more than Entisols. 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 Coos County, Oregon. 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
Milbury-Bohannon-Umpcoos association, 50 to 80 percent slopes	125K	Well drained	B	Very limited	Very limited
Preacher-Bohannon loams, 60 to 90 percent slopes	106K	Well drained	B	Very limited	Very limited
Preacher-Bohannon loams, 30 to 60 percent slopes	77K	Well drained	B	Very limited	Very limited
Digger-Preacher-Umpcoos association, 50 to 80 percent slopes	65K	Well drained	B	Very limited	Very limited
Umpcoos-Rock outcrop association, 70 to 99 percent slopes	44K	Well drained	D	Very limited	Very limited
Digger-Umpcoos-Rock outcrop association, 50 to 90 percent slopes	44K	Well drained	D	Very limited	Very limited
Etelka-Whobrey-Remote complex, 30 to 60 percent slopes	36K	Moderately well drained	C	Very limited	Very limited
Remote-Digger-Preacher complex, 30 to 50 percent slopes	35K	Well drained	B	Very limited	Very limited
Templeton silt loam, 30 to 50 percent slopes	33K	Well drained	B	Very limited	Very limited
Preacher-Blachly association, 30 to 60 percent slopes	28K	Well drained	B	Very limited	Very limited
Templeton silt loam, 7 to 30 percent slopes	28K	Well drained	B	Very limited	Very limited
Preacher-Bohannon loams, 3 to 30 percent slopes	27K	Well drained	B	Very limited	Very limited
Rinearson silt loam, 30 to 50 percent slopes	25K	Well drained	B	Very limited	Very limited
Water	19K			Not rated	Not rated
Preacher-Blachly association, 12 to 30 percent slopes	16K	Well drained	B	Very limited	Very limited
Preacher-Blachly-Digger association, 30 to 60 percent slopes	13K	Well drained	B	Very limited	Very limited
Etelka silt loam, 30 to 50 percent slopes	12K	Moderately well drained	C	Very limited	Very limited
Millicoma-Templeton complex, 50 to 75 percent slopes	10K	Well drained	C	Very limited	Very limited
Honeygrove silty clay loam, 30 to 50 percent slopes	10K	Well drained	C	Very limited	Very limited
Kirkendall silt loam	10K	Well drained	B	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.

Inceptisols

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

Spodosols

Acidic forest soils with a leached layer. Common under conifers. Often have drainage issues from a compacted subsoil layer.

Ultisols

Strongly weathered clay soils of the Southeast. Acidic and naturally low in nutrients. Clay subsoil can slow drainage.

Entisols

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

Andisols

Volcanic ash soils — light, porous, and fertile. Excellent drainage, but low density can complicate foundations.

What This Means

Building & Foundations

About 97% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 97% 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.