Sinkhole risk in Hood River County, OR: 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 522 square miles, under one square mile of Hood River County maps onto soluble rock. With about 23,764 residents (46 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 277 map points about 1.4 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: how ground with no limestone still opens up, and how these percentages are measured.

Counties around Hood River County

The nearest county rated sinkhole country is Emery County, UT, about 716 miles southeast. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Wasco County, OR 34 mi southeast · 0% at surface
Clackamas County, OR 36 mi southwest · 0% at surface
Multnomah County, OR 37 mi west · 0% at surface
Skamania County, WA 38 mi north · 0% at surface
Clark County, WA 44 mi northwest · 0% at surface
Sherman County, OR 48 mi east · 0% at surface

Against the rest of Oregon

Hood River County ranks 22 of 36 in Oregon for soluble rock at the surface, and sits above 0% of US counties on that measure.