Mendocino County, Eastern Part and Southwestern Part of Trinity County, 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 Mendocino County, Eastern Part and Southwestern Part of Trinity County, California.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Yorkville-Yorktree-Ashokawna complex, 30 to 50 percent slopes, MLRA 5 | 59K | Well drained | D | Very limited | Very limited |
| Yorkville-Ashokawna Witherell complex, 30 to 50 percent slopes, MLRA 5 | 59K | Moderately well drained | C | Very limited | Very limited |
| Sanhedrin-Kekawaka-Speaker complex, 30 to 50 percent slopes | 53K | Well drained | C | Very limited | Very limited |
| Yorktree-Hopland-Woodin complex, 30 to 50 percent slopes | 42K | Well drained | C | Very limited | Very limited |
| Casabonne-Wohly loams, 30 to 50 percent slopes | 40K | Well drained | C | Very limited | Very limited |
| Shortyork-Yorkville-Witherell complex, 30 to 50 percent slopes, MLRA 5 | 36K | Well drained | C | Very limited | Very limited |
| Hopland-Sanhedrin-Kekawaka complex, 30 to 50 percent slopes | 31K | Well drained | C | Very limited | Very limited |
| Maymen-Woodin-Etsel complex, 50 to 75 percent slopes | 31K | Somewhat excessively drained | D | Very limited | Very limited |
| Hopland-Witherell-Ashokawna complex, 30 to 50 percent slopes, MLRA 5 | 30K | Well drained | C | Very limited | Very limited |
| Maymen-Etsel-Snook complex, 30 to 75 percent slopes, high ffd | 29K | Somewhat excessively drained | D | Very limited | Very limited |
| Yorktree-Yorkville loams, 30 to 50 percent slopes | 28K | Well drained | C | Very limited | Very limited |
| Maymen-Etsel-Snook complex, 30 to 75 percent slopes, low ffd | 18K | Somewhat excessively drained | D | Very limited | Very limited |
| Area not surveyed, access denied | 18K | Not rated | Not rated | ||
| Casabonne-Wohly-Pardaloe complex, 50 to 75 percent slopes, low ffd | 17K | Well drained | C | Very limited | Very limited |
| Pardaloe-Woodin complex, 50 to 75 percent slopes, low ffd | 16K | Well drained | B | Very limited | Very limited |
| Bearwallow-Hellman-Witherell complex, 30 to 50 percent slopes | 14K | Well drained | C | Very limited | Very limited |
| Yorktree-Hopland-Woodin complex, 50 to 75 percent slopes | 14K | Well drained | C | Very limited | Very limited |
| Dingman-Beaughton complex, 5 to 50 percent slopes | 14K | Well drained | D | Very limited | Very limited |
| Maymen-Etsel-Mayacama complex, 30 to 75 percent slopes | 14K | Somewhat excessively drained | D | Very limited | Very limited |
| Shortyork-Yorkville-Witherell complex, 15 to 30 percent slopes, MLRA 5 | 13K | Well drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 96% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes. A geotechnical assessment is recommended before building.
Septic Systems
About 96% 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.