Humboldt County, South Part, California
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). 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.
| 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 |
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.