33 counties mapped. On average, 16% of Oregon county soil area is high shrink-swell clay (USDA SSURGO).
Higher percentages mean more of a county's mapped soil is shrink-swell clay that expands and contracts with moisture. This is county-scale exposure, not a diagnosis of any single home — but it tells you whether soil movement belongs on your radar.
Foundation repair is one of the most over-sold jobs in home services — quotes for the same house can vary 3×. Before you sign anything, learn how to get honest bids and what a fair price looks like.
Before you call a foundation company →| County | Tier | High-risk % | Moderate % |
|---|---|---|---|
| Baker | Severe | 51% | 16% |
| Lake | Severe | 46% | 26% |
| Harney | Severe | 37% | 37% |
| Wallowa | Severe | 33% | 28% |
| Wheeler | High | 30% | 31% |
| Union | High | 29% | 35% |
| Yamhill | High | 27% | 50% |
| Grant | High | 26% | 27% |
| Linn | High | 24% | 41% |
| Crook | High | 23% | 30% |
| Marion | High | 22% | 50% |
| Klamath | High | 20% | 14% |
| Benton | High | 19% | 59% |
| Polk | High | 19% | 49% |
| Malheur | High | 19% | 33% |
| Douglas | High | 16% | 41% |
| Curry | Moderate | 14% | 32% |
| Josephine | Moderate | 14% | 30% |
| Lane | Moderate | 13% | 43% |
| Hood River | Moderate | 10% | 2% |
| Umatilla | Moderate | 8% | 26% |
| Morrow | Moderate | 8% | 16% |
| Coos | Moderate | 8% | 38% |
| Washington | Moderate | 7% | 49% |
| Columbia | Moderate | 7% | 27% |
| Clackamas | Moderate | 6% | 43% |
| Gilliam | Low | 3% | 12% |
| Wasco | Low | 1% | 8% |
| Lincoln | Low | 1% | 54% |
| Clatsop | Low | 1% | 36% |
| Tillamook | Low | 1% | 14% |
| Multnomah | Low | 0% | 10% |
| 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.