Sinkhole risk in Twiggs County, GA: Pockets of it

Pockets of it

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

On soluble rock: 91%
At or near the surface: 39%
Buried under cover: 52%

What to do about a house in Twiggs 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 327 of Twiggs County's 359 square miles on soluble rock, 140 of them with the rock at or near the surface. With about 7,728 residents (22 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 563 map points about 0.8 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Twiggs County

The nearest county rated sinkhole country is Houston County, GA, about 20 miles southwest, 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.

Bleckley County, GA 17 mi south · 39% at surface
Wilkinson County, GA 17 mi northeast · 44% at surface
Bibb County, GA 18 mi northwest · 6% at surface
Houston County, GA 20 mi southwest · 61% at surface
Peach County, GA 24 mi west · 59% at surface
Jones County, GA 26 mi north · 11% at surface

Which formation it is

The largest mapped soluble unit here is the Ocala Limestone (limestone), Eocene in age, covering about 39% of the county. Next is the Lower Tertiary-Cretaceous undifferentiated at 35%.

Against the rest of Georgia

Twiggs County ranks 25 of 159 in Georgia for soluble rock at the surface, and sits above 84% of US counties on that measure.