SinkholeOdds

Sinkhole risk in Hickman 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
37%
At or near the surface
37%
Buried under cover
0%

What to do about a house in Hickman 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 225 of Hickman County's 612 square miles on soluble rock, 225 of them with the rock at or near the surface. With about 25,859 residents (42 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 307 map points about 1.4 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: the signs to look for and how an inspection works, and how these percentages are measured.

Counties around Hickman County

The nearest county rated sinkhole country is Dickson County, TN, about 24 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.

What Hickman County is built on

The largest mapped soluble unit here is the St. Louis Limestone and Warsaw Limestone (limestone), Mississippian in age, covering about 24% of the county. Next is the Silurian Formations, including Decatur Limestone, Brownsport Group (Lobelville Formation, Bob Limestone, Beech River Formation), Wayne Group (Dixon Formation, Lego Formation, Waldron Shale, Laurel Limestone, Osgood Formation) and Brassfield Limestone at 6%.

Against the rest of Tennessee

Hickman County ranks 54 of 95 in Tennessee for soluble rock at the surface, and sits above 82% of US counties on that measure.