National Training Center, Fort Irwin, 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 National Training Center, Fort Irwin, California.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Dalvord-Etinarg association, 15 to 50 percent slopes | 45K | Somewhat excessively drained | D | Very limited | Very limited |
| Noble Pass complex, 8 to 30 percent slopes | 32K | Well drained | D | Very limited | Very limited |
| Arizo-Granitepass-Bikelake complex, 2 to 8 percent slopes | 29K | Well drained | A | Not limited | Not limited |
| Goldivide extremely gravelly-Granitepass-Goldivide complex, 2 to 8 percent slopes | 24K | Well drained | A | Not limited | Not limited |
| Goldivide-Cajon-Twobitter association, 2 to 8 percent slopes | 22K | Well drained | A | Not limited | Very limited |
| Gravesumit-Cajon-Livefire complex, 2 to 4 percent slopes | 21K | Somewhat excessively drained | A | Not limited | Not limited |
| Dalvord-Angelpoint-Rock outcrop association, 30 to 75 percent slopes | 21K | Somewhat excessively drained | D | Very limited | Very limited |
| Dalvord-Rock outcrop association, 15 to 50 percent slopes | 15K | Somewhat excessively drained | D | Very limited | Very limited |
| Cavespring very gravelly sandy loam, 4 to 15 percent slopes | 15K | Well drained | A | Somewhat limited | Somewhat limited |
| Crackerjack-Dime association, 8 to 50 percent slopes | 14K | Well drained | D | Very limited | Very limited |
| Arizo very gravelly sandy loam, 2 to 4 percent slopes | 14K | Excessively drained | A | Not limited | Not limited |
| Noble Pass-Rock outcrop association, 30 to 75 percent slopes | 14K | Well drained | D | Very limited | Very limited |
| Langwell-Artillery-Rock outcrop association, 8 to 30 percent slopes | 13K | Somewhat excessively drained | D | Very limited | Very limited |
| Nellake-Arizo association, 4 to 15 percent slopes | 13K | Well drained | B | Somewhat limited | Somewhat limited |
| Venusite-Uxo association, 2 to 15 percent slopes | 13K | Well drained | A | Not limited | Not limited |
| Arizo-Twobitter association, 2 to 8 percent slopes | 12K | Excessively drained | A | Not limited | Very limited |
| Crosgrain extremely gravelly loam, 8 to 30 percent slopes | 12K | Well drained | D | Very limited | Very limited |
| Juratrias-Mulespring-Newera complex, 8 to 75 percent slopes | 12K | Well drained | D | Very limited | Very limited |
| Dalvord-Rock outcrop-Langwell complex, 15 to 50 percent slopes | 11K | Somewhat excessively drained | D | Very limited | Very limited |
| Twobitter-Arizo association, 2 to 8 percent slopes | 11K | Well drained | B | Not limited | Very limited |
What This Means
Building & Foundations
About 52% 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 64% 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.