Humboldt County, South Part, California

Survey Area CA601• California

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 Humboldt County, South Part, California. 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
Canoecreek-Sproulish-Redwohly complex, 50 to 75 percent slopes	61K	Well drained	B	Very limited	Very limited
Sproulish-Canoecreek-Redwohly complex, 30 to 50 percent slopes	56K	Well drained	C	Very limited	Very limited
Burgsblock-Coolyork-Tannin complex, 30 to 50 percent slopes	32K	Well drained	C	Very limited	Very limited
Crazycoyote-Sproulish-Canoecreek complex, 30 to 50 percent slopes	26K	Well drained	B	Very limited	Very limited
Tannin-Wohly-Rockyglen complex, 30 to 50 percent slopes	23K	Well drained	C	Very limited	Very limited
Crazycoyote-Sproulish-Canoecreek complex, 50 to 75 percent slopes	23K	Well drained	B	Very limited	Very limited
Yorknorth-Witherell complex, 15 to 30 percent slopes	22K	Moderately well drained	D	Very limited	Very limited
Sproulish, warm-Canoecreek-Redwohly, warm complex, 30 to 50 percent slopes	18K	Well drained	C	Very limited	Very limited
Burgsblock-Coolyork-Tannin complex, 15 to 30 percent slopes	17K	Well drained	B	Very limited	Very limited
Redwoodhouse-Yagercreek-Mailridge complex, 30 to 50 percent slopes	16K	Well drained	C	Very limited	Very limited
Coolyork-Yorknorth complex, 30 to 50 percent slopes	16K	Moderately well drained	D	Very limited	Very limited
Yorknorth-Witherell complex, 30 to 50 percent slopes	13K	Moderately well drained	D	Very limited	Very limited
Canoecreek-Coyoterock-Sproulish complex, 15 to 50 percent slopes	13K	Well drained	B	Very limited	Very limited
Sproulish-Canoecreek-Redwohly complex, 15 to 30 percent slopes	13K	Well drained	C	Very limited	Very limited
Tannin-Wohly-Rockyglen complex, 50 to 75 percent slopes	12K	Well drained	B	Very limited	Very limited
Crazycoyote-Sproulish-Caperidge complex, 15 to 50 percent slopes	12K	Well drained	B	Very limited	Very limited
Humic Dystrustepts, 50 to 110 percent slopes	12K	Well drained	B	Very limited	Very limited
Coolyork-Yorknorth complex, 5 to 30 percent slopes	12K	Moderately well drained	D	Very limited	Very limited
Caperidge-Taylorpeak-Northbear complex, 50 to 75 percent slopes	12K	Well drained	B	Very limited	Very limited
Sproulish, warm-Canoecreek-Redwohly, warm complex, 15 to 30 percent slopes	11K	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.

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.

Alfisols

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

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 100% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes. A geotechnical assessment is recommended before building.

Septic Systems

About 100% 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.