Clatsop County, Oregon

Survey Area OR007• 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 Clatsop 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
Rinearson silt loam, 30 to 60 percent slopes	46K	Well drained	B	Very limited	Very limited
Water	43K			Not rated	Not rated
Templeton-Ecola silt loams, 30 to 60 percent slopes	39K	Well drained	B	Very limited	Very limited
Klootchie-Necanicum complex, 30 to 60 percent slopes	37K	Well drained	B	Very limited	Very limited
Skipanon gravelly medial silt loam, 30 to 60 percent slopes	33K	Well drained	B	Very limited	Very limited
Skipanon gravelly medial silt loam, 3 to 30 percent slopes	28K	Well drained	B	Very limited	Very limited
Rinearson silt loam, 3 to 30 percent slopes	20K	Well drained	B	Very limited	Very limited
Caterl-Laderly complex, 30 to 60 percent slopes	18K	Well drained	B	Very limited	Very limited
Templeton medial silt loam, 3 to 30 percent slopes	16K	Well drained	B	Very limited	Very limited
Klootchie silt loam, 3 to 30 percent slopes	15K	Well drained	B	Very limited	Very limited
Scaponia-Braun silt loams, 30 to 60 percent slopes	14K	Well drained	B	Very limited	Very limited
Necanicum-Ascar complex, 30 to 60 percent slopes	13K	Well drained	B	Very limited	Very limited
Laderly-Rock outcrop complex, 60 to 90 percent slopes	11K	Well drained	B	Very limited	Very limited
Hemcross-Klistan complex, 30 to 60 percent slopes	11K	Well drained	B	Very limited	Very limited
Svensen medial loam, 30 to 60 percent slopes	10K	Well drained	A	Very limited	Very limited
Coquille-Clatsop complex, protected, 0 to 1 percent slopes	10K	Very poorly drained	C/D	Very limited	Very limited
Murtip-Caterl complex, 30 to 60 percent slopes	9K	Well drained	B	Very limited	Very limited
Coquille-Clatsop complex, 0 to 1 percent slopes	8K	Very poorly drained	C/D	Very limited	Very limited
Necanicum-Ascar complex, 60 to 90 percent slopes	7K	Well drained	B	Very limited	Very limited
Caterl-Laderly complex, 3 to 30 percent slopes	7K	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.

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.

Ultisols

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

What This Means

Building & Foundations

About 89% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 89% 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.