SinkholeOdds

Sinkhole risk in Linn 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%

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 2,290 square miles, under one square mile of Linn County maps onto soluble rock. With about 132,474 residents (58 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 308 map points about 2.7 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 Linn County

The nearest county rated sinkhole country is Emery County, UT, about 716 miles southeast. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Against the rest of Oregon

Linn County ranks 27 of 36 in Oregon for soluble rock at the surface, and sits above 0% of US counties on that measure.