Sinkhole risk in Perry County, IL: 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 442 square miles, under one square mile of Perry County maps onto soluble rock. With about 20,272 residents (46 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 380 map points about 1.1 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why gypsum and salt move faster than limestone, and how these percentages are measured.

Counties around Perry County

The nearest county rated sinkhole country is Perry County, MO, about 35 miles southwest, close enough that the same rock may run under the county line. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Washington County, IL 19 mi north · 0% at surface
Jackson County, IL 21 mi south · under 1% at surface
Randolph County, IL 25 mi west · under 1% at surface
Franklin County, IL 25 mi east · 0% at surface
Jefferson County, IL 28 mi northeast · 0% at surface
Williamson County, IL 34 mi southeast · 0% at surface

Against the rest of Illinois

Perry County ranks 83 of 102 in Illinois for soluble rock at the surface, and sits above 0% of US counties on that measure.