Sinkhole risk in Sandusky County, OH: Pockets of it

Pockets of it

Soluble rock at the surface or under thin cover in part of the county.

On soluble rock: 97%
At or near the surface: 0%
Buried under cover: 97%

What this means before you buy

Check the parcel against your state survey sinkhole map, and ask for an inspection if cracks, depressions or sticking doors show up.

That works out to roughly 396 of Sandusky County's 408 square miles on soluble rock. With about 58,866 residents (144 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 335 map points about 1.1 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why the 97% under cover still counts, and the signs to look for and how an inspection works.

Counties around Sandusky County

The nearest county rated sinkhole country is Monroe County, MI, about 43 miles northwest. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Ottawa County, OH 15 mi northeast · 0% at surface
Seneca County, OH 16 mi south · 0% at surface
Wood County, OH 25 mi west · 0% at surface
Lucas County, OH 28 mi northwest · 0% at surface
Erie County, OH 29 mi east · under 1% at surface
Huron County, OH 32 mi southeast · 0% at surface

What Sandusky County is built on

The largest mapped soluble unit here is the Lockport Dolomite (dolostone (dolomite)), Silurian in age, covering about 45% of the county. Next is the Tymochtee and Greenfield Formations, Undivided at 25%.

Against the rest of Ohio

Sandusky County ranks 72 of 88 in Ohio for soluble rock at the surface, and sits above 0% of US counties on that measure.