Lassen National Forest, California, Parts of Lassen, Plumas, Butte, Shasta, and Siskiyou Counties
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 Lassen National Forest, California, Parts of Lassen, Plumas, Butte, Shasta, and Siskiyou Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Inville family-Sheld family, moderately deep-Rubble Land association, 15 to 50 percent slopes. | 82K | Well drained | B | Very limited | Very limited |
| Trojan-Inville-Patio families association, 0 to 35 percent slopes. | 72K | Well drained | B | Very limited | Very limited |
| Inville-Wintoner families complex, 0 to 35 percent slopes. | 39K | Well drained | B | Very limited | Very limited |
| Klicker-Trojan families association, 0 to 35 percent slopes. | 31K | Well drained | B | Very limited | Very limited |
| Lava Flow. | 21K | Excessively drained | Very limited | Very limited | |
| Yallani-Sheld-Portola families association, 0 to 35 percent slopes. | 20K | Well drained | A | Very limited | Very limited |
| Inville-Patio-Trojan families association, 0 to 35 percent slopes. | 20K | Well drained | B | Very limited | Very limited |
| Sheld family-Sheld family, moderately deep complex, 0 to 35 percent slopes. | 20K | Well drained | B | Very limited | Very limited |
| Sheld family, moderately deep-Lithic Xerumbrepts association, 0 to 35 percent slopes. | 19K | Well drained | B | Very limited | Very limited |
| Rubble Land-Pass Canyon family-Bobbitt family, moderately deep association, 35 to 70 percent slopes. | 19K | Excessively drained | Very limited | Very limited | |
| Lava Flow-Lithic Xerochrepts complex, 0 to 35 percent slopes. | 19K | Excessively drained | Very limited | Very limited | |
| Trojan-Inville-Boomtowm families association, 0 to 35 percent slopes. | 18K | Well drained | B | Very limited | Very limited |
| De Masters-Klicker families association, 0 to 35 percent slopes. | 17K | Well drained | B | Very limited | Very limited |
| Rock Outcrop-Rubble Land complex. | 16K | Excessively drained | D | Very limited | Very limited |
| Sheld family,0 to 35 percent slopes. | 16K | Well drained | B | Very limited | Very limited |
| Wintoner family-Aquolls-Patio family association, 0 to 15 percent slopes. | 15K | Well drained | C | Very limited | Very limited |
| Klicker family-Klicker family, very stony association, 0 to 35 percent slopes. | 13K | Well drained | B | Very limited | Very limited |
| Yallani-Sheld families complex, 0 to 35 percent slopes. | 13K | Well drained | A | Very limited | Very limited |
| Bobbitt- Brownlee-Alicel families comples, 0 to 35 percent slopes | 12K | Well drained | B | Very limited | Very limited |
| Lithic Haploxerolls-Aquolls complex,0 to 15 percent slopes. | 12K | Somewhat excessively drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 100% 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 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.