Hualapai-Havasupai Area, Arizona, Parts of Coconino, Mohave, and Yavapai 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 Hualapai-Havasupai Area, Arizona, Parts of Coconino, Mohave, and Yavapai Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Rock outcrop-Torriorthents complex, 35 to 120 percent slopes | 229K | D | Not rated | Not rated | |
| Natank-Disterheff-Yumtheska complex, 2 to 35 percent slopes | 88K | Well drained | D | Very limited | Very limited |
| Hindu-Rock outcrop complex, 5 to 45 percent slopes | 74K | Well drained | D | Very limited | Very limited |
| Curhollow-Rolie-Meriwhitica association, 1 to 35 percent slopes | 70K | Well drained | D | Very limited | Very limited |
| Winona-Rock outcrop-Tusayan complex, 15 to 55 percent slopes | 51K | Well drained | D | Very limited | Very limited |
| Toqui-Yumtheska complex, 2 to 30 percent slopes | 46K | Well drained | D | Very limited | Very limited |
| Wodomont-Rock outcrop complex, 5 to 40 percent slopes | 46K | Well drained | D | Very limited | Very limited |
| Curhollow-Puertecito complex, 1 to 12 percent slopes | 41K | Well drained | D | Very limited | Very limited |
| Deama-Rock outcrop complex, 25 to 55 percent slopes | 36K | Well drained | D | Very limited | Very limited |
| Topocoba-Wodomont complex, 2 to 15 percent slopes | 34K | Well drained | D | Very limited | Very limited |
| Splanod-Rock outcrop complex, 2 to 15 percent slopes | 32K | D | Not rated | Not rated | |
| Winona-Curhollow complex, 1 to 12 percent slopes | 30K | Well drained | D | Very limited | Very limited |
| Ustorthents-Rock outcrop complex, 35 to 90 percent slopes | 29K | Well drained | D | Not rated | Not rated |
| Rizno-Rock outcrop complex, 2 to 15 percent slopes | 28K | Well drained | D | Very limited | Very limited |
| Pinntank-Pocomate-Retsover complex, 1 to 30 percent slopes | 27K | Well drained | D | Very limited | Very limited |
| Poley-Rolie complex, 1 to 8 percent slopes | 26K | Well drained | C | Somewhat limited | Very limited |
| Rolie-Dean complex, 2 to 20 percent slopes | 25K | Well drained | D | Somewhat limited | Very limited |
| Metuck-Rock outcrop complex, 15 to 60 percent slopes | 20K | Well drained | D | Very limited | Very limited |
| Wodomont-Coconino complex, 2 to 15 percent slopes | 18K | Well drained | D | Very limited | Very limited |
| Luzena-Thunderbird complex, 3 to 20 percent slopes | 17K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 64% 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 69% 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.