Sinkhole risk in Dodge County, WI: Pockets of it

Pockets of it

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

On soluble rock: 94%
At or near the surface: 0%
Buried under cover: 94%

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 821 of Dodge County's 876 square miles on soluble rock. With about 88,635 residents (101 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 395 map points about 1.5 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Dodge County

The nearest county rated sinkhole country is Iowa County, WI, about 78 miles west. 1 of the 6 closest counties land in the same band; the ground changes quickly around here.

Washington County, WI 24 mi east · 0% at surface
Fond du Lac County, WI 25 mi northeast · 0% at surface
Green Lake County, WI 28 mi northwest · 0% at surface
Jefferson County, WI 29 mi south · 3% at surface
Columbia County, WI 32 mi west · under 1% at surface
Waukesha County, WI 35 mi southeast · 0% at surface

What Dodge County is built on

The largest mapped soluble unit here is the Sinnipee Group (dolostone (dolomite)), Ordovician in age, covering about 50% of the county. Next is the Silurian, undivided at 13%.

Against the rest of Wisconsin

Dodge County ranks 33 of 72 in Wisconsin for soluble rock at the surface, and sits above 0% of US counties on that measure.