Sinkhole risk in Fulton 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: 98%
At or near the surface: 0%
Buried under cover: 98%

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 360 of Fulton County's 368 square miles on soluble rock. With about 20,004 residents (54 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 292 map points about 1.1 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: why the 98% under cover still counts, and how these percentages are measured.

Counties around Fulton County

The nearest county rated sinkhole country is Barry County, MI, about 117 miles northeast. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Marshall County, IN 19 mi north · 0% at surface
Cass County, IN 21 mi south · 4% at surface
Pulaski County, IN 22 mi west · 0% at surface
Miami County, IN 22 mi southeast · under 1% at surface
Kosciusko County, IN 25 mi northeast · 0% at surface
Starke County, IN 26 mi northwest · 0% at surface

The rock underneath

The largest mapped soluble unit here is the Wabash Formation (limestone), Silurian in age, covering about 66% of the county. Next is the Muscatatuck Group at 32%.

Against the rest of Indiana

Fulton County ranks 49 of 92 in Indiana for soluble rock at the surface, and sits above 0% of US counties on that measure.