Sinkhole risk in Johnson County, AR: 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 this means before you buy

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

Across 661 square miles, under one square mile of Johnson County maps onto soluble rock. With about 26,172 residents (40 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 298 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 Johnson County

The nearest county rated sinkhole country is Carroll County, AR, about 53 miles north. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Franklin County, AR 24 mi west · 0% at surface
Pope County, AR 26 mi east · 0% at surface
Newton County, AR 27 mi northeast · 24% at surface
Logan County, AR 28 mi southwest · 0% at surface
Madison County, AR 34 mi northwest · 27% at surface
Yell County, AR 40 mi south · 0% at surface

Against the rest of Arkansas

Johnson County ranks 54 of 75 in Arkansas for soluble rock at the surface, and sits above 0% of US counties on that measure.