Sinkhole risk in Elmore 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 3,075 square miles, under one square mile of Elmore County maps onto soluble rock. With about 29,729 residents (10 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 529 map points about 2.4 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 Elmore County

The nearest county rated sinkhole country is Emery County, UT, about 391 miles southeast. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Camas County, ID 36 mi east · 2% at surface
Ada County, ID 39 mi west · 0% at surface
Boise County, ID 43 mi north · 0% at surface
Gooding County, ID 44 mi southeast · 0% at surface
Canyon County, ID 64 mi west · 0% at surface
Gem County, ID 65 mi northwest · 0% at surface

Against the rest of Idaho

Elmore County ranks 33 of 44 in Idaho for soluble rock at the surface, and sits above 0% of US counties on that measure.