Expansive Soil in Indiana: County Ratings
6 of the 92 rated counties in Indiana have a dominant shrink-swell rating of High or Very High. Each rating below is the NRCS shrink-swell class covering the largest share of the county's mapped soil acres, computed from USDA SSURGO data. Open a county for the full class breakdown and what it means for a slab foundation.
| County | Dominant class | High + Very High share | Survey coverage |
|---|---|---|---|
| Adams County | Moderate | 9% | 98% |
| Allen County | Moderate | 8% | 97% |
| Bartholomew County | Moderate | 2% | 98% |
| Benton County | Moderate | 2% | 100% |
| Blackford County | Moderate | 42% | 99% |
| Boone County | Moderate | 0% | 99% |
| Brown County | Low | 1% | 98% |
| Carroll County | Moderate | 0% | 98% |
| Cass County | Moderate | 2% | 97% |
| Clark County | Low | 20% | 88% |
| Clay County | Low | 2% | 98% |
| Clinton County | Moderate | 0% | 100% |
| Crawford County | Low | 8% | 97% |
| Daviess County | Low | 2% | 98% |
| De Kalb County | Moderate | 19% | 96% |
| Dearborn County | High | 44% | 98% |
| Decatur County | Moderate | 1% | 99% |
| Delaware County | Moderate | 1% | 98% |
| Dubois County | Low | 0% | 98% |
| Elkhart County | Moderate | 0% | 96% |
| Fayette County | Moderate | 0% | 99% |
| Floyd County | Low | 44% | 82% |
| Fountain County | Moderate | 0% | 99% |
| Franklin County | Moderate | 14% | 98% |
| Fulton County | Low | 0% | 93% |
| Gibson County | Low | 3% | 96% |
| Grant County | Moderate | 3% | 99% |
| Greene County | Low | 6% | 99% |
| Hamilton County | Moderate | 0% | 97% |
| Hancock County | Moderate | 0% | 99% |
| Harrison County | High | 62% | 99% |
| Hendricks County | Moderate | 0% | 99% |
| Henry County | Moderate | 4% | 99% |
| Howard County | Moderate | 0% | 99% |
| Huntington County | Moderate | 0% | 98% |
| Jackson County | Low | 4% | 98% |
| Jasper County | Low | 6% | 98% |
| Jay County | Moderate | 40% | 99% |
| Jefferson County | Low | 13% | 99% |
| Jennings County | Low | 4% | 99% |
| Johnson County | Moderate | 0% | 98% |
| Knox County | Low | 3% | 98% |
| Kosciusko County | Low | 4% | 90% |
| La Porte County | Low | 1% | 96% |
| Lagrange County | Low | 3% | 91% |
| Lake County | Moderate | 18% | 84% |
| Lawrence County | High | 55% | 98% |
| Madison County | Moderate | 0% | 99% |
| Marion County | Moderate | 0% | 91% |
| Marshall County | Moderate | 1% | 94% |
| Martin County | Moderate | 3% | 98% |
| Miami County | Moderate | 2% | 97% |
| Monroe County | Low | 24% | 94% |
| Montgomery County | Moderate | 1% | 99% |
| Morgan County | Moderate | 1% | 98% |
| Newton County | Low | 6% | 99% |
| Noble County | Moderate | 5% | 90% |
| Ohio County | High | 47% | 99% |
| Orange County | Moderate | 18% | 98% |
| Owen County | Low | 4% | 98% |
| Parke County | Moderate | 0% | 98% |
| Perry County | Low | 19% | 97% |
| Pike County | Low | 0% | 97% |
| Porter County | Moderate | 7% | 93% |
| Posey County | Low | 1% | 97% |
| Pulaski County | Low | 2% | 98% |
| Putnam County | Moderate | 0% | 98% |
| Randolph County | Moderate | 5% | 99% |
| Ripley County | Low | 6% | 99% |
| Rush County | Moderate | 0% | 100% |
| Scott County | Low | 0% | 97% |
| Shelby County | Moderate | 0% | 99% |
| Spencer County | Low | 2% | 98% |
| St. Joseph County | Low | 2% | 95% |
| Starke County | Low | 0% | 95% |
| Steuben County | Moderate | 1% | 86% |
| Sullivan County | Moderate | 1% | 96% |
| Switzerland County | High | 49% | 98% |
| Tippecanoe County | Moderate | 1% | 97% |
| Tipton County | Moderate | 0% | 100% |
| Union County | Moderate | 0% | 97% |
| Vanderburgh County | Low | 4% | 97% |
| Vermillion County | Moderate | 7% | 97% |
| Vigo County | Moderate | 1% | 97% |
| Wabash County | Moderate | 3% | 97% |
| Warren County | Moderate | 2% | 99% |
| Warrick County | Low | 1% | 96% |
| Washington County | High | 43% | 99% |
| Wayne County | Moderate | 8% | 99% |
| Wells County | Moderate | 24% | 99% |
| White County | Moderate | 0% | 99% |
| Whitley County | Moderate | 17% | 96% |
How these ratings are computed
Ratings come from USDA NRCS SSURGO soil survey data: for each soil component we take the maximum linear extensibility percent (lep_r) in the top 100 cm, apply the NRCS Handbook Part 618 class limits (Low under 3 percent, Moderate 3 to 6, High 6 to 9, Very High 9 and above), assign map units by plurality of component percent, and roll acres up to the county. Full details on the methodology section of the lookup page. A county rating is not a parcel-level geotechnical assessment.