Modoc National Forest Area, California
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high 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 Modoc National Forest Area, California.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Paynepeak-Fingeridge assciation | 68K | Well drained | B | Very limited | Very limited |
| Lawyer deep-Elmore deep families association, 1 to 20 percent slopes. | 67K | Well drained | C | Somewhat limited | Very limited |
| Deven-Bieber-Barnard families complex, 0 to 5 percent slopes. | 52K | Well drained | D | Very limited | Very limited |
| Lawyer-Elmore-Gwin families association, 1 to 20 percent slopes. | 49K | Well drained | C | Somewhat limited | Very limited |
| Deven-Bieber-Pass Canyon fanilies association, 1 to 15 percent slopes. | 48K | Well drained | D | Very limited | Very limited |
| Germany family-Lithic Xerumbrepts-Lava flows association, 1 to 20 percent slopes. | 48K | Well drained | Not limited | Very limited | |
| Supan-Supan deep-Pass Canyon families association, 1 to 20 percent slopes. | 48K | Well drained | C | Somewhat limited | Very limited |
| Bieber-Deven-Roval families complex, 1 to 10 percent slopes. | 47K | Well drained | D | Very limited | Not limited |
| Deven-Pass Canyon families complex, 1 to 10 percent slopes. | 47K | Well drained | D | Very limited | Very limited |
| Puls-Roval-Dishner families complex, 0 to 5 percent slopes. | 45K | Well drained | D | Very limited | Not limited |
| Water | 41K | D | Not rated | Not rated | |
| Bakeoven family-Lava flows-Lithic Xerorthents, mesic association, 1 to 15 percent slopes. | 39K | Well drained | D | Somewhat limited | Very limited |
| Roval-Pass Canyon families complex, 1 to 15 percent slopes. | 36K | Well drained | D | Somewhat limited | Not limited |
| Pass Canyon-Elmore families-Lava flows association, 1 to 20 percent slopes. | 33K | Well drained | D | Somewhat limited | Somewhat limited |
| Pass Canyon-Los Gatos families complex, 1 to 20 percent slopes. | 32K | Well drained | D | Somewhat limited | Somewhat limited |
| Lava flows | 31K | Excessively drained | Not rated | Not rated | |
| Smarts deep-Smarts families complex, 2 to 20 percent slopes. | 29K | Well drained | C | Somewhat limited | Very limited |
| Pass Canyon-Fordice-Gwin families association, 1 to 20 percent slopes. | 26K | Well drained | D | Somewhat limited | Somewhat limited |
| Pass Canyon-Fordice-Gwin families association, 20 to 40 percent slopes. | 26K | Well drained | D | Very limited | Very limited |
| Packwood-Ditchcamp families-Rock outcrop complex, 1 to 10 percent slopes. | 26K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 42% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 65% 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.