Yakama Nation Closed Area, Washington, Parts of Klickitat and Yakima Counties
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 Yakama Nation Closed Area, Washington, Parts of Klickitat and Yakima Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Adamslake ashy fine sandy loam, 0 to 20 percent slopes | 35K | Well drained | B | Somewhat limited | Somewhat limited |
| Singh-Adamslake complex, cool, 0 to 20 percent slopes | 27K | Well drained | C | Somewhat limited | Very limited |
| Nank-Yikwil, cool complex, 2 to 20 percent slopes | 23K | Well drained | C | Somewhat limited | Very limited |
| Singh ashy sandy loam, 0 to 20 percent slopes | 22K | Well drained | C | Somewhat limited | Very limited |
| Nank ashy sandy loam, 2 to 20 percent slopes | 15K | Well drained | C | Somewhat limited | Very limited |
| Yatama ashy sandy loam, 0 to 20 percent slopes | 12K | Well drained | B | Somewhat limited | Very limited |
| Satus stony ashy loam, 35 to 60 percent slopes, stony | 11K | Well drained | B | Very limited | Very limited |
| Waaw ashy sandy loam, 5 to 20 percent slopes | 11K | Well drained | A | Somewhat limited | Very limited |
| Millerpoint ashy sandy loam, 0 to 20 percent slopes | 11K | Well drained | B | Somewhat limited | Somewhat limited |
| Twolakes-Walupt complex, 5 to 20 percent slopes | 9K | Well drained | B | Somewhat limited | Somewhat limited |
| Singh ashy fine sandy loam, bedrock substratum, dry, 5 to 20 percent slopes | 8K | Well drained | C | Somewhat limited | Very limited |
| Adamslake-Singh complex, cool, 0 to 20 percent slopes | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| Firoke ashy fine sandy loam, 5 to 30 percent slopes, stony | 7K | Well drained | B | Very limited | Very limited |
| Rock outcrop and Rubble land, 20 to 90 percent slopes | 7K | Very limited | Very limited | ||
| Naxing stony ashy loam, 25 to 45 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Singh ashy sandy loam, 20 to 35 percent slopes | 6K | Well drained | C | Very limited | Very limited |
| Panak ashy loam, 5 to 30 percent slopes | 6K | Well drained | B | Very limited | Very limited |
| Satus, stony-Adamslake complex, 5 to 20 percent slopes | 6K | Well drained | B | Somewhat limited | Somewhat limited |
| Snowplow ashy sandy loam, 0 to 20 percent slopes | 6K | Well drained | B | Somewhat limited | Somewhat limited |
| Glen ashy sandy loam, 0 to 2 percent slopes | 6K | Well drained | A | Not limited | Very limited |
What This Means
Building & Foundations
Most soils are generally favorable for residential construction. Standard foundations are usually viable, though site-specific evaluation is always recommended.
Septic Systems
About 69% 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.