Nulato Hills - Continental Divide and Blackburn Hills 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 Nulato Hills - Continental Divide and Blackburn Hills Area, Alaska.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Yukon-Kuskokwim Highlands-Boreal Upland and Alpine-Rounded Mountains | 1.1M | Well drained | B | Very limited | Very limited |
| Seward Peninsula Highlands-Arctic Upland-Loess Plains | 829K | Very poorly drained | B/D | Very limited | Very limited |
| Yukon-Kuskokwim Highlands-Boreal Upland-Rounded Mountains | 692K | Well drained | B | Very limited | Very limited |
| Yukon-Kuskokwim Highlands-Boreal Alpine and Subalpine-Rounded Mountains | 291K | Well drained | B | Very limited | Very limited |
| Seward Peninsula Highlands-Arctic Upland-Rounded Mountains, Acid | 257K | Moderately well drained | C | Very limited | Very limited |
| Northern Seward Peninsula-Selawik Lowlands-Arctic Upland-Plains, Gravelly | 214K | Very poorly drained | D | Very limited | Very limited |
| Arctic Coastal Plain-Arctic Lowland-Coastal Plains, Low | 177K | Very poorly drained | D | Very limited | Very limited |
| Seward Peninsula Highlands-Arctic Upland-Hills and Plains, Gravelly | 156K | Very poorly drained | D | Very limited | Very limited |
| Ungalik-Tenmileriver complex, 10 to 35 percent slopes | 144K | Well drained | B | Very limited | Very limited |
| Igniq-Tikigak-Uvluutit complex, 6 to 20 percent slopes | 139K | Well drained | B/D | Very limited | Very limited |
| Urgiilik-Silagiksaak association, 5 to 50 percent slopes | 124K | Well drained | C | Very limited | Very limited |
| Yukon-Kuskokwim Highlands-Boreal Upland-Valleys | 118K | Poorly drained | D | Very limited | Very limited |
| Yukon-Kuskokwim Highlands, Boreal Hills | 113K | Well drained | D | Very limited | Very limited |
| Nulato Hills-Southern Seward Peninsula Highlands-Boreal Upland and Maritime Upland-Rounded Mountains | 111K | Well drained | B | Very limited | Very limited |
| Seward Peninsula Highlands-Arctic Upland-Rounded Mountains | 103K | Well drained | B | Very limited | Very limited |
| Urgiilik-Nunanjiak complex, 15 to 45 percent slopes | 100K | Well drained | B | Very limited | Very limited |
| Interior Alaska Lowlands-Boreal Lowland-Flood Plains and Terraces | 97K | Poorly drained | B | Very limited | Very limited |
| Tikigak-Ungalik complex, 10 to 45 percent slopes | 86K | Well drained | B | Very limited | Very limited |
| Kikku-Nagruk complex, 0 to 20 percent slopes | 86K | Very poorly drained | A/D | Very limited | Very limited |
| Tui-Tumi-Iyyagrik complex, 15 to 70 percent slopes | 83K | Well drained | B | Very limited | Very limited |
What This Means
Building & Foundations
About 100% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas, flood-prone areas. 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.