Togiak National Wildlife Refuge-Ahklun Mountains Area, Alaska
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 Togiak National Wildlife Refuge-Ahklun Mountains Area, Alaska.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Goodnews-Buchia association, 5 to 85 percent slopes | 350K | Well drained | B | Very limited | Very limited |
| Ahklun-Klak association, 12 to 85 percent slopes | 325K | Well drained | B | Very limited | Very limited |
| Highlake-Rock outcrop-Rubble land complex, 0 to 150 percent slopes | 218K | Very limited | Very limited | ||
| Kwethluk-Nagugun-Pungokepuk complex, 2 to 25 percent slopes | 169K | Well drained | A | Very limited | Very limited |
| Klak-Mitlak-Twinhills association, 5 to 65 percent slopes | 152K | Well drained | A | Very limited | Very limited |
| Rocky-Metervik complex, 0 to 3 percent slopes | 127K | Well drained | B/D | Very limited | Very limited |
| Ahklun very gravelly medial sandy loam, 20 to 85 percent slopes | 126K | Well drained | B | Very limited | Very limited |
| Nagugun-Mosquitopoint-Pungokepuk complex, 0 to 35 percent slopes | 116K | Well drained | A | Very limited | Very limited |
| Nagugun-Klak-Kwethluk-Pungokepuk complex, 0 to 35 percent slopes | 87K | Well drained | A | Very limited | Very limited |
| Longarm-Ongivinuck complex, 0 to 3 percent slopes | 86K | Poorly drained | B/D | Very limited | Very limited |
| Rocky-Ongivinuck complex, 0 to 5 percent slopes | 86K | Well drained | B/D | Very limited | Very limited |
| Water | 75K | Not rated | Not rated | ||
| Pegati-Klak-Awayak complex, 0 to 25 percent slopes | 67K | Well drained | B/D | Very limited | Very limited |
| Klak-Nagugun-Pegati-Typic Cryofluvents, occasionally flooded, complex, 0 to 35 percent slopes | 61K | Well drained | A | Very limited | Very limited |
| Snakeriver peat, 0 to 3 percent slopes | 60K | Very poorly drained | A/D | Very limited | Very limited |
| Buchia-Ahklun complex, 20 to 75 percent slopes | 60K | Well drained | B | Very limited | Very limited |
| Outuchiwenat gravelly sandy loam, 10 to 60 percent slopes | 37K | Well drained | B | Very limited | Very limited |
| Typic Cryofluvents, occasionally flooded-Ongivinuck-Snakeriver complex, 0 to 3 percent slopes | 35K | Well drained | C | Very limited | Very limited |
| Goodnews-Nagugun complex, 0 to 15 percent slopes | 29K | Well drained | D | Very limited | Very limited |
| Okstukuk-Typic Haplocryods complex, 0 to 8 percent slopes | 27K | Well drained | B | Somewhat limited | Somewhat limited |
What This Means
Building & Foundations
About 95% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 95% 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.