Sinkhole risk in Del Norte County, CA: No soluble rock mapped
No soluble rock mapped
No soluble bedrock mapped.
- On soluble rock
- under 1%
- At or near the surface
- under 1%
- Buried under cover
- 0%
What to do about a house in Del Norte County
No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.
That works out to roughly 4 of Del Norte County's 1,006 square miles on soluble rock, 4 of them with the rock at or near the surface. With about 27,009 residents (27 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 245 map points about 2.0 miles apart, so a pocket smaller than that can be missed or overstated.
Read next: how these percentages are measured, and the warning signs that apply anywhere.
Counties around Del Norte County
The nearest county rated sinkhole country is Emery County, UT, about 722 miles east. 1 of the 6 closest counties land in the same band; the ground changes quickly around here.
- Josephine County, OR 49 mi northeast · 9% at surface
- Curry County, OR 51 mi north · under 1% at surface
- Humboldt County, CA 72 mi south · 3% at surface
- Siskiyou County, CA 76 mi east · 9% at surface
- Jackson County, OR 81 mi northeast · 2% at surface
- Trinity County, CA 88 mi southeast · 25% at surface
Which formation it is
The largest mapped soluble unit here is the Paleozoic marine rocks, undivided, unit 9 (Western Klamath Mountains) (argillite), Devonian to Jurassic in age, covering about under 1% of the county.
Against the rest of California
Del Norte County ranks 24 of 58 in California for soluble rock at the surface, and sits above 52% of US counties on that measure.
- Trinity County 25%
- Inyo County 17%
- Ventura County 9%
- Shasta County 9%
- Siskiyou County 9%