Sinkhole risk in Portage County, WI: No soluble rock mapped

No soluble rock mapped

No soluble bedrock mapped.

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

The next step for one property

No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.

Across 801 square miles, under one square mile of Portage County maps onto soluble rock. With about 72,040 residents (90 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 358 map points about 1.5 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Portage County

The nearest county rated sinkhole country is Vernon County, WI, about 89 miles southwest. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Waupaca County, WI 26 mi east · 0% at surface
Wood County, WI 27 mi west · 0% at surface
Waushara County, WI 28 mi southeast · 0% at surface
Marathon County, WI 32 mi northwest · 0% at surface
Adams County, WI 37 mi south · 0% at surface
Shawano County, WI 42 mi northeast · 0% at surface

Against the rest of Wisconsin

Portage County ranks 56 of 72 in Wisconsin for soluble rock at the surface, and sits above 0% of US counties on that measure.