Humboldt County, Central Part, California
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). 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, Central Part, California.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Sproulish-Canoecreek-Redwohly complex, 30 to 50 percent slopes | 54K | Well drained | C | Very limited | Very limited |
| Canoecreek-Sproulish-Redwohly complex, 50 to 75 percent slopes | 50K | Well drained | B | Very limited | Very limited |
| Redwoodhouse-Yagercreek-Mailridge complex, 30 to 50 percent slopes | 32K | Well drained | C | Very limited | Very limited |
| Pasturerock-Coyoterock-Maneze complex, 15 to 50 percent slopes, dry | 28K | Well drained | C | Very limited | Very limited |
| Tannin-Burgsblock-Rockyglen complex, 30 to 50 percent slopes | 27K | Well drained | B | Very limited | Very limited |
| Scoutcamp-Rootcreek-Redcrest complex, 30 to 50 percent slopes | 25K | Well drained | C | Very limited | Very limited |
| Coppercreek-Slidecreek-Tectah complex, 30 to 50 percent slopes | 23K | Well drained | C | Very limited | Very limited |
| Tannin-Burgsblock-Rockyglen complex, 50 to 75 percent slopes | 19K | Well drained | B | Very limited | Very limited |
| Northbear-Caperidge-Taylorpeak complex, 30 to 50 percent slopes | 19K | Well drained | B | Very limited | Very limited |
| Sproulish, warm-Canoecreek-Redwohly, warm complex, 30 to 50 percent slopes | 18K | Well drained | C | Very limited | Very limited |
| Highyork-Elkcamp-Airstrip complex, 9 to 30 percent slopes | 17K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Ferncat-Sleepyhollow-Oilcreek complex, 30 to 50 percent slopes | 14K | Well drained | C | Very limited | Very limited |
| Burgsblock-Coolyork-Tannin complex, 15 to 30 percent slopes | 14K | Well drained | B | Very limited | Very limited |
| Redwoodhouse-Yagercreek-Mailridge complex, 15 to 30 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Sproulish-Canoecreek-Redwohly complex, 15 to 30 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Slidecreek-Lackscreek-Coppercreek complex, 50 to 75 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Redwoodhouse-Yagercreek-Mailridge complex, 50 to 75 percent slopes | 13K | Well drained | B | Very limited | Very limited |
| Lepoil-Espa-Candymountain complex, 15 to 50 percent slopes | 12K | Well drained | B | Very limited | Very limited |
| Hydraquents-Wassents mucky silt loam, strongly saline, 0-3 percent slopes, very frequently flooded | 12K | Very poorly drained | D | Very limited | Very limited |
| Lepoil-Candymountain complex, 2 to 15 percent slopes | 11K | Well drained | B | Not limited | Very limited |
What This Means
Building & Foundations
About 97% 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 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.