Sinkhole risk in Alameda County, CA: 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 737 square miles, under one square mile of Alameda County maps onto soluble rock. With about 1,649,060 residents (2,236 per square mile), most of the county is built up, so a mapped unit is likely to sit under somebody's street. The figures come from 539 map points about 1.2 miles apart, so a pocket smaller than that can be missed or overstated.
Two things to read before deciding: how these percentages are measured, and the warning signs that apply anywhere.
Counties around Alameda County
The nearest county rated sinkhole country is Emery County, UT, about 613 miles east. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.
- Contra Costa County, CA 19 mi north · 0% at surface
- San Mateo County, CA 30 mi southwest · 1% at surface
- Santa Clara County, CA 32 mi southeast · 4% at surface
- San Joaquin County, CA 40 mi northeast · 0% at surface
- Solano County, CA 43 mi north · 0% at surface
- Santa Cruz County, CA 44 mi south · 3% at surface
Against the rest of California
Alameda County ranks 27 of 58 in California for soluble rock at the surface, and sits above 0% of US counties on that measure.
- Trinity County 25%
- Inyo County 17%
- Ventura County 9%
- Shasta County 9%
- Siskiyou County 9%