Sinkhole risk in Columbia County, OR: No soluble rock mapped

No soluble rock mapped

No soluble bedrock mapped.

On soluble rock: 0%
At or near the surface: 0%
Buried under cover: 0%

The next step for one property

No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.

Across 659 square miles, under one square mile of Columbia County maps onto soluble rock. With about 54,063 residents (82 per square mile), homes are spread across towns and farmland, and a mapped unit may or may not reach the developed parts. 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 these percentages are measured, and the warning signs that apply anywhere.

Counties around Columbia County

The nearest county rated sinkhole country is Emery County, UT, about 790 miles southeast. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Cowlitz County, WA 26 mi northeast · 0% at surface
Washington County, OR 27 mi south · 0% at surface
Wahkiakum County, WA 29 mi northwest · 0% at surface
Clatsop County, OR 30 mi west · 0% at surface
Clark County, WA 31 mi east · 0% at surface
Multnomah County, OR 42 mi southeast · 0% at surface

Against the rest of Oregon

Columbia County ranks 16 of 36 in Oregon for soluble rock at the surface, and sits above 0% of US counties on that measure.