Sinkhole risk in Wyandot County, OH: 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: 100%
At or near the surface: 0%
Buried under cover: 100%

What this means before you buy

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

That works out to roughly 407 of Wyandot County's 407 square miles on soluble rock. With about 21,394 residents (53 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 364 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 100% under cover still counts, and how these percentages are measured.

Counties around Wyandot County

The nearest county rated sinkhole country is Monroe County, MI, about 75 miles north. 1 of the 6 closest counties land in the same band; the ground changes quickly around here.

Marion County, OH 19 mi southeast · 0% at surface
Crawford County, OH 20 mi east · 0% at surface
Hancock County, OH 21 mi northwest · 0% at surface
Seneca County, OH 22 mi northeast · 0% at surface
Hardin County, OH 22 mi southwest · 0% at surface
Morrow County, OH 35 mi southeast · 0% at surface

Which formation it is

The largest mapped soluble unit here is the Tymochtee and Greenfield Formations, Undivided (dolostone (dolomite)), Silurian in age, covering about 57% of the county. Next is the Salina Group at 23%.

Against the rest of Ohio

Wyandot County ranks 88 of 88 in Ohio for soluble rock at the surface, and sits above 0% of US counties on that measure.