Sinkhole risk in Grundy County, TN: Pockets of it

Pockets of it

Soluble rock at the surface or under thin cover in part of the county.

On soluble rock: 21%
At or near the surface: 21%
Buried under cover: 0%

What to do about a house in Grundy County

Check the parcel against your state survey sinkhole map, and ask for an inspection if cracks, depressions or sticking doors show up.

That works out to roughly 75 of Grundy County's 360 square miles on soluble rock, 75 of them with the rock at or near the surface. With about 14,148 residents (39 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 265 map points about 1.2 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Grundy County

The nearest county rated sinkhole country is Warren County, TN, about 20 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.

Sequatchie County, TN 17 mi east · 21% at surface
Marion County, TN 19 mi south · 39% at surface
Warren County, TN 20 mi north · 81% at surface
Coffee County, TN 22 mi west · 74% at surface
Van Buren County, TN 25 mi northeast · 27% at surface
Franklin County, TN 27 mi southwest · 66% at surface

What Grundy County is built on

The largest mapped soluble unit here is the Monteagle Limestone (limestone), Mississippian in age, covering about 11% of the county. Next is the Bangor Limestone and Hartselle Formation at 8%.

Against the rest of Tennessee

Grundy County ranks 68 of 95 in Tennessee for soluble rock at the surface, and sits above 75% of US counties on that measure.