Sinkhole risk in Sheboygan County, WI: 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%

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 509 of Sheboygan County's 512 square miles on soluble rock. With about 118,331 residents (231 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 365 map points about 1.2 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why the 100% under cover still counts, and how these percentages are measured.

Counties around Sheboygan County

The nearest county rated sinkhole country is Oceana County, MI, about 64 miles east. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Ozaukee County, WI 17 mi south · 0% at surface
Manitowoc County, WI 30 mi north · under 1% at surface
Calumet County, WI 34 mi northwest · 0% at surface
Washington County, WI 35 mi southwest · 0% at surface
Fond du Lac County, WI 38 mi west · 0% at surface
Winnebago County, WI 52 mi northwest · under 1% at surface

What Sheboygan County is built on

The largest mapped soluble unit here is the Silurian, undivided (dolostone (dolomite)), Silurian in age, covering about 96% of the county. Next is the Traverse Group at 4%.

Against the rest of Wisconsin

Sheboygan County ranks 63 of 72 in Wisconsin for soluble rock at the surface, and sits above 0% of US counties on that measure.