Sinkhole risk in Clearwater County, ID: Not karst, but voids possible

Not karst, but voids possible

No soluble bedrock; some pseudokarst (piping or lava-tube ground).

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

What this means before you buy

Not true karst, but soil piping or lava tubes can still open voids - mention it to an inspector.

Across 2,457 square miles, under one square mile of Clearwater County maps onto soluble rock. With about 9,151 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 246 map points about 3.2 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: how ground with no limestone still opens up, and how these percentages are measured.

Counties around Clearwater County

The nearest county rated sinkhole country is Emery County, UT, about 585 miles southeast. None of the 6 closest counties land in the same band, so Clearwater County stands out from its surroundings.

Mineral County, MT 41 mi northeast · 37% at surface
Lewis County, ID 47 mi southwest · under 1% at surface
Shoshone County, ID 48 mi north · under 1% at surface
Latah County, ID 52 mi west · 0% at surface
Idaho County, ID 58 mi south · under 1% at surface
Nez Perce County, ID 58 mi southwest · 3% at surface

Against the rest of Idaho

Clearwater County ranks 32 of 44 in Idaho for soluble rock at the surface, and sits above 0% of US counties on that measure.