Mohave County Area, Arizona, Northeastern Part, and Part of Coconino County
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 Mohave County Area, Arizona, Northeastern Part, and Part of Coconino County.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Mellenthin very gravelly loam, 1 to 25 percent slopes | 96K | Well drained | D | Very limited | Very limited |
| Pennell gravelly loam, 1 to 12 percent slopes | 70K | Well drained | D | Very limited | Very limited |
| Pennell-Bacobi complex, 1 to 7 percent slopes | 64K | Well drained | D | Very limited | Very limited |
| Torriorthents-Rock outcrop complex, 30 to 70 percent slopes | 60K | Well drained | Not rated | Not rated | |
| Saido-Brinkerhoff complex, 1 to 5 percent slopes | 58K | Well drained | B | Very limited | Somewhat limited |
| Poley-Moab complex, 1 to 10 percent slopes | 47K | Well drained | C | Somewhat limited | Very limited |
| Clayhole loam, 1 to 3 percent slopes | 45K | Well drained | B | Very limited | Somewhat limited |
| Haplogypsids-Haplogypsids, shallow complex, 1 to 50 percent slopes | 43K | Well drained | A | Very limited | Very limited |
| Barx fine sandy loam, 1 to 5 percent slopes | 40K | Well drained | B | Somewhat limited | Somewhat limited |
| Jocity-Clayhole complex, 1 to 4 percent slopes | 31K | Well drained | C | Somewhat limited | Very limited |
| Havasupai-Mellenthin complex, 2 to 12 percent slopes | 27K | Well drained | D | Very limited | Very limited |
| Bidonia-Bond-Rock outcrop complex, 1 to 25 percent slopes | 24K | Well drained | D | Very limited | Very limited |
| Jocity silty clay loam, 1 to 4 percent slopes | 23K | Well drained | D | Not limited | Very limited |
| Grieta loam, 1 to 5 percent slopes | 23K | Well drained | B | Not limited | Somewhat limited |
| Yumtheska very gravelly loam, 4 to 20 percent slopes | 23K | Well drained | D | Very limited | Very limited |
| Kinan-Hatknoll-Grieta complex, 1 to 5 percent slopes | 20K | Well drained | B | Not limited | Somewhat limited |
| Showlow very cobbly clay loam, 1 to 15 percent slopes | 20K | Well drained | C | Very limited | Very limited |
| Grieta fine sandy loam, 1 to 5 percent slopes | 18K | Well drained | B | Not limited | Somewhat limited |
| Royosa-Tonalea complex, 1 to 15 percent slopes | 18K | Excessively drained | A | Not limited | Very limited |
| Mellenthin-Barx complex, 1 to 15 percent slopes | 15K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 63% 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 65% 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.