Yukon Tanana Uplands West and Bordering Area, Alaska
The most common soil here is E31-Boreal forest-silty slopes, on about 32% of the land. E31-Boreal forest-gravelly colluvial slopes and E31-Boreal taiga-silty frozen colluvial slopes come next.
About 87% of the land drains well, and 12% stays wet for long stretches; groundwater comes within two feet of the surface under 81% of it.
USDA rates all of the land very limited for a standard septic drain field, and all very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: bedrock lies within 40 inches under 18% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The biggest mapped areas
The dominant drainage class is Well drained and the dominant hydrologic group is A (high infiltration, low runoff). The most common soil order is Gelisols — permafrost soils found in very cold climates. 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 Yukon Tanana Uplands West and Bordering Area, Alaska. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Interior Alaska Highlands-Boreal Upland-Rounded Mountains, Acid | 4.5M | Well drained | A | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Alpine and Upland-Rugged Mountains, Acid | 999K | Well drained | C | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Upland-Hills and Plains | 255K | Poorly drained | D | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Upland and Alpine-Rounded Mountains, Acid | 228K | Well drained | C | Very limited | Very limited |
| Interior Alaska Lowlands-Boreal Lowland-Flood Plains and Terraces, High Elevation | 151K | Poorly drained | D | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Alpine and Upland-Rugged Mountains | 147K | Well drained | B | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Upland and Lowland-Mountain Valleys | 146K | Poorly drained | D | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Lowland-Flood Plains and Terraces | 89K | Poorly drained | D | Very limited | Very limited |
| Interior Alaska Lowlands-Boreal Lowland-Alluvial Plains, Wet | 65K | Very poorly drained | D | Very limited | Very limited |
| Interior Alaska Lowlands-Boreal Lowland-Fan Terraces and Stream Terraces | 58K | Poorly drained | D | Very limited | Very limited |
| Interior Alaska Lowlands-Boreal Lowland-Flood Plains and Terraces, Wet | 39K | Very poorly drained | B/D | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Upland and Alpine-Rugged Mountains | 33K | Well drained | A | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Upland-Hills and Plains, Acid | 32K | Well drained | D | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Upland-Loess Plains and Peat Plateaus | 22K | Poorly drained | C/D | Very limited | Very limited |
| Interior Alaska Highlands-Boreal Alpine-Barren Mountains | 14K | Very limited | Very limited | ||
| Interior Alaska Lowlands-Boreal Lowland-Peatlands and Alluvial Plains | 12K | Poorly drained | D | Very limited | Very limited |
| Interior Alaska Lowlands-Boreal Water, Fresh | 12K | Not limited | Not limited | ||
| Interior Alaska Highlands-Boreal Upland and Subalpine-Rounded Mountains | 10K | Well drained | B | Not limited | Very limited |
| Interior Alaska Lowlands-Boreal Upland-Eolian Plains, Sand Hills, and Dunes | 1K | Somewhat excessively drained | D | Very limited | Very limited |
| Interior Alaska Mountains-Boreal Glaciated Plains and Hills | 64 | Poorly drained | D | Very limited | Very limited |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
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.