12 counties mapped. On average, 10% of Oregon county soil area is high shrink-swell clay (USDA SSURGO).
Foundation problems get more expensive the longer they wait. Get an assessment and repair quotes from independent local pros.
Get repair quotes →| County | Tier | High-risk % | Moderate % |
|---|---|---|---|
| Yamhill | High | 27% | 50% |
| Benton | High | 19% | 59% |
| Polk | High | 19% | 49% |
| Curry | Moderate | 14% | 32% |
| Josephine | Moderate | 14% | 30% |
| Coos | Moderate | 8% | 38% |
| Washington | Moderate | 7% | 49% |
| Columbia | Moderate | 7% | 27% |
| Gilliam | Low | 3% | 12% |
| Clatsop | Low | 1% | 36% |
| Tillamook | Low | 1% | 14% |
| Sherman | Low | 0% | 0% |
Risk metrics are computed from USDA SSURGO soil survey data (linear extensibility of soil components, area-weighted by county). Soil varies lot to lot — this is county-scale context, not a substitute for a site-specific geotechnical or structural assessment.