Sinkhole risk in Seneca 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: 86%
At or near the surface: 0%
Buried under cover: 86%

The next step for one property

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 476 of Seneca County's 551 square miles on soluble rock. With about 54,730 residents (99 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 389 map points about 1.2 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Seneca County

The nearest county rated sinkhole country is Monroe County, MI, about 58 miles north. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Sandusky County, OH 16 mi north · 0% at surface
Crawford County, OH 22 mi southeast · 0% at surface
Wyandot County, OH 22 mi southwest · 0% at surface
Huron County, OH 28 mi east · 0% at surface
Hancock County, OH 29 mi west · 0% at surface
Ottawa County, OH 30 mi north · 0% at surface

What Seneca County is built on

The largest mapped soluble unit here is the Lockport Dolomite (dolostone (dolomite)), Silurian in age, covering about 29% of the county. Next is the Tymochtee and Greenfield Formations, Undivided at 23%.

Against the rest of Ohio

Seneca County ranks 74 of 88 in Ohio for soluble rock at the surface, and sits above 0% of US counties on that measure.