Sinkhole risk in Henry County, IN: Mostly deep or small

Mostly deep or small

Some soluble rock, mostly deeply buried or in a small share of the county.

On soluble rock: 89%
At or near the surface: 0%
Buried under cover: 89%

The next step for one property

Sinkholes are uncommon here; watch for new depressions after heavy rain or leaking pipes.

That works out to roughly 350 of Henry County's 392 square miles on soluble rock. With about 49,081 residents (125 per square mile), homes are spread across towns and farmland, and a mapped unit may or may not reach the developed parts. The figures come from 379 map points about 1.0 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: why the 89% under cover still counts, and how these percentages are measured.

Counties around Henry County

The nearest county rated sinkhole country is Monroe County, IN, about 80 miles southwest. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Delaware County, IN 21 mi north · 0% at surface
Wayne County, IN 21 mi east · under 1% at surface
Hancock County, IN 21 mi west · 0% at surface
Rush County, IN 22 mi south · 0% at surface
Fayette County, IN 23 mi southeast · 0% at surface
Madison County, IN 24 mi northwest · 0% at surface

What Henry County is built on

The largest mapped soluble unit here is the Louisville Limestone through Brassfield Limestone (limestone), Silurian in age, covering about 34% of the county. Next is the Pleasant Mills Formation at 23%.

Against the rest of Indiana

Henry County ranks 55 of 92 in Indiana for soluble rock at the surface, and sits above 0% of US counties on that measure.