Sinkhole risk in Tillamook 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%

What to do about a house in Tillamook County

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

Across 1,103 square miles, under one square mile of Tillamook County maps onto soluble rock. With about 27,264 residents (25 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 250 map points about 2.1 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 Tillamook County

The nearest county rated sinkhole country is Emery County, UT, about 801 miles southeast. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Yamhill County, OR 26 mi southeast · 0% at surface
Washington County, OR 33 mi east · 0% at surface
Clatsop County, OR 39 mi north · 0% at surface
Polk County, OR 42 mi southeast · 3% at surface
Columbia County, OR 47 mi northeast · 0% at surface
Lincoln County, OR 57 mi south · 0% at surface

Against the rest of Oregon

Tillamook County ranks 32 of 36 in Oregon for soluble rock at the surface, and sits above 0% of US counties on that measure.