Robinson Mountains and Gulf of Alaska Coast Area, Alaska

Survey Area AK709• Alaska

The dominant drainage class is Very poorly drained and the dominant hydrologic group is B/D (varies with drainage). The most common soil order is Entisols — young soils with little profile development, often on floodplains or steep slopes. 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 Robinson Mountains and Gulf of Alaska Coast 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
Southern Alaska Coastal Mountains-Maritime Alpine-Barren Mountains	779K			Not rated	Not rated
Alexander Archipelago-Gulf of Alaska Coast-Maritime Water, Saline	200K			Very limited	Very limited
Southern Alaska Coastal Mountains-Maritime Subalpine and Alpine-Mountains	123K			Very limited	Very limited
Alexander Archipelago-Gulf of Alaska Coast-Maritime Upland-Glaciofluvial Plains and Beaches	117K	Poorly drained	B/D	Very limited	Very limited
Alexander Archipelago-Gulf of Alaska Coast-Maritime Upland and Subalpine-Rounded Mountains	98K	Very poorly drained	A/D	Very limited	Very limited
Alexander Archipelago-Gulf of Alaska Coast-Maritime Upland-Hills, Recently Glaciated	97K	Somewhat poorly drained	B/D	Very limited	Very limited
Alexander Archipelago-Gulf of Alaska Coast-Maritime Lowland-Coastal Plains, Deltas and Mud Flats	79K	Very poorly drained	B/D	Very limited	Very limited
Alexander Archipelago-Gulf of Alaska Coast-Maritime Subalpine and Alpine-Rounded Mountains	14K			Very limited	Very limited
Southern Alaska Coastal Mountains-Maritime Water, Fresh	4K			Very limited	Very limited
Southern Alaska Coastal Mountains-Maritime Upland-Mountains, Recently Glaciated	2K	Somewhat poorly drained	B	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.

Entisols

Young soils with little development — found on floodplains, dunes, and steep slopes. Properties vary widely by setting.

Inceptisols

Young but developing soils found in mountains and river terraces. Variable properties — check drainage and bedrock depth.

Spodosols

Acidic forest soils with a leached layer. Common under conifers. Often have drainage issues from a compacted subsoil layer.

Histosols

Organic peat and muck soils formed in wetlands. Very poor for building (compressible) and septic. Often in regulated wetlands.

What This Means

Building & Foundations

About 48% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

Septic Systems

About 48% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.

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.