Sinkhole risk in Keweenaw County, MI: 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%

What to do about a house in Keweenaw County

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

Across 540 square miles, under one square mile of Keweenaw County maps onto soluble rock. With about 2,161 residents (4 per square mile), much of the land is open, and the mapped rock may sit far from where people actually live. The figures come from 310 map points about 1.3 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 Keweenaw County

The nearest county rated sinkhole country is Emmet County, MI, about 202 miles southeast. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Houghton County, MI 29 mi southwest · 0% at surface
Baraga County, MI 46 mi south · 0% at surface
Ontonagon County, MI 57 mi southwest · 0% at surface
Marquette County, MI 61 mi southeast · 0% at surface
Iron County, MI 83 mi south · 0% at surface
Gogebic County, MI 91 mi southwest · 0% at surface

Against the rest of Michigan

Keweenaw County ranks 50 of 83 in Michigan for soluble rock at the surface, and sits above 0% of US counties on that measure.