St. Lawrence Island Area, Alaska
The most common soil here is E39-Maritime tussock-silty frozen slopes, on about 32% of the land. E39-Maritime dwarf scrub-gravelly colluvial slopes and E39-Maritime scrub-sedge-gravelly frozen till slopes come next.
About 36% of the land drains well, and 62% stays wet for long stretches; groundwater comes within two feet of the surface under 98% of it.
USDA rates 98% of the land very limited for a standard septic drain field, and 98% 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 36% 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 Very poorly drained and the dominant hydrologic group is D (very slow infiltration, high 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 St. Lawrence Island 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 |
|---|---|---|---|---|---|
| Northern Bering Sea Islands-Maritime Upland-Plains | 730K | Very poorly drained | D | Very limited | Very limited |
| Northern Bering Sea Islands-NorthMaritime Upland-Rounded Mountains | 424K | Well drained | D | Very limited | Very limited |
| Northern Bering Sea Islands-Maritime Water, Saline | 28K | Not limited | Not 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 98% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas. A geotechnical assessment is recommended before building.
Septic Systems
About 98% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.