Coos County, Oregon
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 Coos County, Oregon.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Milbury-Bohannon-Umpcoos association, 50 to 80 percent slopes | 125K | Well drained | B | Very limited | Very limited |
| Preacher-Bohannon loams, 60 to 90 percent slopes | 106K | Well drained | B | Very limited | Very limited |
| Preacher-Bohannon loams, 30 to 60 percent slopes | 77K | Well drained | B | Very limited | Very limited |
| Digger-Preacher-Umpcoos association, 50 to 80 percent slopes | 65K | Well drained | B | Very limited | Very limited |
| Umpcoos-Rock outcrop association, 70 to 99 percent slopes | 44K | Well drained | D | Very limited | Very limited |
| Digger-Umpcoos-Rock outcrop association, 50 to 90 percent slopes | 44K | Well drained | D | Very limited | Very limited |
| Etelka-Whobrey-Remote complex, 30 to 60 percent slopes | 36K | Moderately well drained | C | Very limited | Very limited |
| Remote-Digger-Preacher complex, 30 to 50 percent slopes | 35K | Well drained | B | Very limited | Very limited |
| Templeton silt loam, 30 to 50 percent slopes | 33K | Well drained | B | Very limited | Very limited |
| Preacher-Blachly association, 30 to 60 percent slopes | 28K | Well drained | B | Very limited | Very limited |
| Templeton silt loam, 7 to 30 percent slopes | 28K | Well drained | B | Very limited | Very limited |
| Preacher-Bohannon loams, 3 to 30 percent slopes | 27K | Well drained | B | Very limited | Very limited |
| Rinearson silt loam, 30 to 50 percent slopes | 25K | Well drained | B | Very limited | Very limited |
| Water | 19K | Not rated | Not rated | ||
| Preacher-Blachly association, 12 to 30 percent slopes | 16K | Well drained | B | Very limited | Very limited |
| Preacher-Blachly-Digger association, 30 to 60 percent slopes | 13K | Well drained | B | Very limited | Very limited |
| Etelka silt loam, 30 to 50 percent slopes | 12K | Moderately well drained | C | Very limited | Very limited |
| Millicoma-Templeton complex, 50 to 75 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Honeygrove silty clay loam, 30 to 50 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Kirkendall silt loam | 10K | Well drained | B | Very limited | Very limited |
What This Means
Building & Foundations
About 97% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 97% 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.