Sinkhole risk in Owyhee 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%

The next step for one property

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

Across 7,668 square miles, under one square mile of Owyhee County maps onto soluble rock. With about 12,748 residents (2 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 261 map points about 5.4 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 Owyhee County

The nearest county rated sinkhole country is Emery County, UT, about 377 miles southeast. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Ada County, ID 61 mi north · 0% at surface
Elmore County, ID 67 mi northeast · 0% at surface
Gooding County, ID 75 mi east · 0% at surface
Canyon County, ID 77 mi north · 0% at surface
Twin Falls County, ID 79 mi east · under 1% at surface
Malheur County, OR 83 mi northwest · under 1% at surface

Against the rest of Idaho

Owyhee County ranks 42 of 44 in Idaho for soluble rock at the surface, and sits above 0% of US counties on that measure.