Chugach National Forest - Kenai Peninsula West Area, Alaska
The dominant drainage class is Well drained and the dominant hydrologic group is A (high infiltration, low runoff). 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 Chugach National Forest - Kenai Peninsula West Area, Alaska.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Cook Inlet Mountains-Boreal Alpine-Mountains | 448K | Well drained | Very limited | Very limited | |
| Cook Inlet Mountains-Boreal Alpine-Barren Mountains | 60K | Very limited | Very limited | ||
| Southern Alaska Coastal Mountains-Maritime Subalpine and Alpine-Mountains | 58K | Very limited | Very limited | ||
| Cook Inlet Mountains-Boreal Upland and Lowland-Valleys | 47K | Well drained | A | Very limited | Very limited |
| Cook Inlet Lowlands-Boreal Water, Saline | 47K | Very limited | Very limited | ||
| Southern Alaska Coastal Mountains-Maritime Water, Fresh | 17K | Very limited | Very limited | ||
| Alexander Archipelago-Gulf of Alaska Coast-Maritime Upland and Subalpine-Rounded Mountains | 17K | Very poorly drained | A/D | Very limited | Very limited |
| 102-Forested Ice Scoured Land | 16K | Somewhat excessively drained | A | Very limited | Very limited |
| Andic Haplocryods-Lithic Haplocryods complex, 16 to 45 percent slopes | 15K | Well drained | A | Very limited | Very limited |
| Southern Alaska Coastal Mountains-Maritime Alpine-Barren Mountains | 13K | Not rated | Not rated | ||
| Andic Haplocryods-Lithic Haplocryods complex, 9 to 25 percent slopes | 11K | Well drained | A | Very limited | Very limited |
| Southern Alaska Coastal Mountains-Maritime Upland-Mountains | 11K | Moderately well drained | B/D | Very limited | Very limited |
| Cook Inlet Lowlands-Boreal Lowland-Coastal Plains | 9K | Very poorly drained | B/D | Very limited | Very limited |
| Andic Haplocryods-Lithic Haplocryods complex, 26 to 65 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Southern Alaska Coastal Mountains-Maritime Lowland-Flood Plains and Terraces | 4K | Very poorly drained | A/D | Very limited | Very limited |
| Typic Cryaquents-Clunie complex, 0 to 3 percent slopes | 3K | Poorly drained | A/D | Very limited | Very limited |
| Andic Haplocryods-Lithic Haplocryods complex, 4 to 15 percent slopes | 3K | Well drained | A | Somewhat limited | Very limited |
| Typic Dystrocryepts-Histic Cryaquepts complex, 0 to 45 percent slopes | 3K | Well drained | A | Very limited | Very limited |
| Typic Dystrocryepts-Andic Haplocryods-Histic Cryaquepts complex, 0 to 45 percent slopes | 3K | Well drained | A | Very limited | Very limited |
| Andic Haplocryods-Lithic Haplocryods complex, 46 to 100 percent slopes | 2K | Well drained | A | Very limited | Very limited |
What This Means
Building & Foundations
About 98% 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 98% 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.