5 counties mapped. On average, 14% of Idaho 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 % |
|---|---|---|---|
| Jefferson | High | 23% | 16% |
| Ada | High | 20% | 43% |
| Jerome County and Part of Twin Falls | High | 15% | 33% |
| Latah | Moderate | 6% | 54% |
| Payette | Low | 4% | 48% |
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.