Lassen Volcanic National Park, 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 Lassen Volcanic National Park, California.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Scoured-Juniperlake-Rock outcrop complex, 3 to 40 percent slopes | 13K | Well drained | B | Very limited | Very limited |
| Cenplat ashy loamy sand, 0 to 15 percent slopes | 9K | Well drained | B | Very limited | Very limited |
| Scoured very bouldery medial loamy sand, 2 to 30 percent slopes | 7K | Well drained | B | Very limited | Very limited |
| Badgerflat-Cenplat complex, 10 to 60 percent slopes | 7K | Well drained | B | Very limited | Very limited |
| Juniperlake gravelly medial sandy loam, 2 to 35 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Emeraldlake-Terracelake-Readingpeak-Rock Outcrop-Rubble land complex, 20 to 95 percent slopes | 5K | Well drained | A | Very limited | Very limited |
| Bearrubble-Rubble land complex, 8 to 40 percent slopes | 5K | Well drained | A | Somewhat limited | Very limited |
| Terracelake-Acroph-Rock outcrop-Shadowlake complex, 15 to 80 percent slopes | 4K | Well drained | B | Very limited | Very limited |
| Terracelake-Shadowlake-Acroph-Rock outcrop complex, 5 to 35 percent slopes | 4K | Well drained | A | Very limited | Very limited |
| Buttelake ashy sand, 3 to 35 percent slopes | 4K | Well drained | A | Somewhat limited | Somewhat limited |
| Sueredo bouldery ashy loamy coarse sand, 2 to 30 percent slopes | 4K | Well drained | A | Somewhat limited | Somewhat limited |
| Badgerflat very gravelly ashy sandy loam, 1 to 30 percent slopes | 4K | Well drained | B | Somewhat limited | Very limited |
| Kingsiron-Dittmar-Rock outcrop complex, 20 to 80 percent slopes | 3K | Well drained | A | Very limited | Very limited |
| Diamondpeak-Brokeoff-Endoaquepts-Aquic Dystroxerepts, debris flows-Typic Dystroxerepts complex, 10 to 80 percent slopes | 3K | Well drained | C | Very limited | Very limited |
| Prospectpeak, ashy coarse sand, 10 to 30 percent slopes | 2K | Well drained | A | Very limited | Very limited |
| Water | 2K | D | Not rated | Not rated | |
| Buttewash ashy coarse sand, 0 to 15 percent slopes | 2K | Well drained | B | Not limited | Somewhat limited |
| Lava Flows | 2K | Not rated | Not rated | ||
| Chaos extremely gravelly ashy coarse sand, 2 to 30 percent slopes | 2K | Somewhat excessively drained | A | Not limited | Very limited |
| Ashbutte-Vitrandic Xerorthents complex, 15 to 60 percent slopes | 2K | Somewhat excessively drained | A | Very limited | Very limited |
What This Means
Building & Foundations
About 72% 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 84% 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.