38 counties mapped. On average, 15% of Colorado 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.
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Before you call a foundation company →| County | Tier | High-risk % | Moderate % |
|---|---|---|---|
| Crowley | Severe | 44% | 22% |
| Arapahoe | Severe | 35% | 14% |
| Washington | Severe | 35% | 26% |
| Archuleta | Severe | 34% | 30% |
| Baca | High | 29% | 29% |
| Lincoln | High | 27% | 32% |
| Elbert | High | 24% | 30% |
| Boulder | High | 20% | 23% |
| Logan | High | 20% | 24% |
| Phillips | High | 19% | 57% |
| Jackson | High | 18% | 5% |
| Weld | High | 17% | 19% |
| Huerfano | High | 17% | 27% |
| Bent | High | 16% | 33% |
| Kit Carson | High | 16% | 49% |
| Kiowa | High | 15% | 52% |
| Prowers | High | 15% | 27% |
| Morgan | High | 15% | 21% |
| La Plata | Moderate | 14% | 20% |
| Denver | Moderate | 14% | 25% |
| Otero | Moderate | 12% | 34% |
| Moffat | Moderate | 12% | 13% |
| Cheyenne | Moderate | 11% | 49% |
| Larimer | Moderate | 10% | 18% |
| Mesa | Moderate | 9% | 36% |
| Saguache | Moderate | 9% | 18% |
| El Paso | Moderate | 9% | 21% |
| Grand | Moderate | 8% | 28% |
| Rio Blanco | Moderate | 8% | 12% |
| Yuma | Moderate | 7% | 17% |
| Fremont | Moderate | 5% | 12% |
| Summit | Low | 4% | 15% |
| Northeastern Part of Gunnison | Low | 3% | 3% |
| Conejos | Low | 2% | 13% |
| Rio Grande | Low | 1% | 23% |
| Costilla | Low | 1% | 16% |
| Sedgwick | Low | 0% | 40% |
| Custer | Low | 0% | 8% |
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.