SinkholeOdds

Sinkhole risk in Henry County, TN: 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 this means before you buy

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 3 of Henry County's 562 square miles on soluble rock, 3 of them with the rock at or near the surface. With about 32,883 residents (59 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 310 map points about 1.3 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 Henry County

The nearest county rated sinkhole country is Stewart County, TN, about 29 miles east, close enough that the same rock may run under the county line. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

What Henry County is built on

The largest mapped soluble unit here is the Devonian Formations, includes Pegram Formation, Camden Formation, Harriman Formation, Flat Gap Limestone, and Ross Formation (limestone), Devonian in age, covering about under 1% of the county.

Against the rest of Tennessee

Henry County ranks 78 of 95 in Tennessee for soluble rock at the surface, and sits above 53% of US counties on that measure.