Sinkhole risk in Floyd County, VA: 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 Floyd County
No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.
Across 381 square miles, under one square mile of Floyd County maps onto soluble rock. With about 15,658 residents (41 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 476 map points about 0.9 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 Floyd County
The nearest county rated sinkhole country is Montgomery County, VA, about 17 miles north, close enough that the same rock may run under the county line. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.
- Montgomery County, VA 17 mi north · 64% at surface
- Radford city, VA 17 mi northwest · 84% at surface
- Patrick County, VA 19 mi south · 0% at surface
- Pulaski County, VA 22 mi northwest · 57% at surface
- Carroll County, VA 25 mi southwest · under 1% at surface
- Franklin County, VA 26 mi east · under 1% at surface
The rock underneath
The largest mapped soluble unit here is the Rome Formation (shale), Cambrian in age, covering about under 1% of the county.
Against the rest of Virginia
Floyd County ranks 96 of 133 in Virginia for soluble rock at the surface, and sits above 50% of US counties on that measure.
- Lexington city 100%
- Salem city 100%
- Roanoke city 98%
- Winchester city 90%
- Bristol city 89%