San Carlos Indian Reservation, Arizona, Parts of Gila and Graham Counties
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 San Carlos Indian Reservation, Arizona, Parts of Gila and Graham Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Pachic Argiustolls-Dedal-Rock outcrop complex, 8 to 35 percent slopes | 125K | Well drained | C | Very limited | Very limited |
| Kuykendall-Beaumain-Rock outcrop complex, 5 to 45 percent slopes | 115K | Well drained | D | Very limited | Very limited |
| Beaumain-Rock outcrop-Cherrycow complex, 5 to 60 percent slopes MLRA 38 | 78K | Well drained | D | Very limited | Very limited |
| Terrarossa-Cloverdale-Blacktail complex, 1 to 35 percent slopes | 62K | Well drained | C | Somewhat limited | Very limited |
| Torriorthents, 3 to 60 percent slopes | 58K | Well drained | C | Very limited | Very limited |
| Thimble-Rock outcrop complex, 10 to 50 percent slopes | 53K | Well drained | D | Very limited | Very limited |
| Eskiminzin and Sontag soils, and rock outcrop, 0 to 5 percent slopes | 52K | Well drained | D | Very limited | Very limited |
| Brolliar-Dedal complex, 0 to 8 percent slopes | 48K | Well drained | D | Very limited | Very limited |
| Tombstone-Eloma-Pedregosa complex, 5 to 65 percent slopes mlra 38 | 46K | Well drained | A | Very limited | Very limited |
| Bigtoe-Ryallen-Tombstone complex, 3 to 30 percent slopes | 44K | Well drained | D | Somewhat limited | Very limited |
| Eloma very gravelly sandy clay loam, 3 to 65 percent slopes mlra 38 | 43K | Well drained | C | Very limited | Very limited |
| Bylas-Rock outcrop-Frye complex, 0 to 20 percent slopes | 41K | Well drained | D | Very limited | Very limited |
| Gavilan family-Sponiker complex, 1 to 25 percent slopes | 38K | Well drained | C | Very limited | Very limited |
| Anezul-Dedal-Rock outcrop complex, 2 to 20 percent slopes | 36K | Well drained | D | Very limited | Very limited |
| Topawa-Rillino-Eba complex, 3 to 50 percent slopes | 35K | Well drained | C | Very limited | Very limited |
| Topawa very gravelly sandy loam, 3 to 15 percent slopes | 34K | Well drained | C | Somewhat limited | Very limited |
| Rock outcrop and Ustorthents and haplustolls soils, 40 to 80 percent slopes | 34K | Well drained | D | Very limited | Very limited |
| Eskiminzin-Rock outcrop complex, 35 to 65 percent slopes | 33K | Well drained | D | Very limited | Very limited |
| Turquoise-Rock outcrop-Nugget complex, 20 to 70 percent slopes | 33K | Well drained | D | Very limited | Very limited |
| Argic Petrocalcids-Rock outcrop-Torriorthents complex, 2 to 60 percent slopes | 32K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 86% 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.