Sinkhole risk in Asotin County, WA: 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 636 square miles, under one square mile of Asotin County maps onto soluble rock. With about 22,523 residents (35 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 297 map points about 1.5 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 Asotin County

The nearest county rated sinkhole country is Emery County, UT, about 595 miles southeast. None of the 6 closest counties land in the same band, so Asotin County stands out from its surroundings.

Garfield County, WA 23 mi northwest · 0% at surface
Nez Perce County, ID 25 mi northeast · 3% at surface
Columbia County, WA 34 mi west · 0% at surface
Lewis County, ID 39 mi east · under 1% at surface
Wallowa County, OR 41 mi south · 2% at surface
Latah County, ID 50 mi northeast · 0% at surface

Against the rest of Washington

Asotin County ranks 10 of 39 in Washington for soluble rock at the surface, and sits above 0% of US counties on that measure.