Sinkhole risk in Pulaski County, GA: Sinkhole country

Sinkhole country

Soluble rock at or near the surface across much of the county.

On soluble rock: 95%
At or near the surface: 67%
Buried under cover: 28%

What to do about a house in Pulaski County

Get a sinkhole or geotechnical inspection before buying, building or adding weight to a foundation.

That works out to roughly 236 of Pulaski County's 249 square miles on soluble rock, 166 of them with the rock at or near the surface. With about 10,180 residents (41 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 257 map points about 1.0 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why the 28% under cover still counts, and the signs to look for and how an inspection works.

Counties around Pulaski County

The closest county with no soluble rock mapped is Schley County, GA, about 49 miles west. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Bleckley County, GA 16 mi northeast · 39% at surface
Houston County, GA 18 mi northwest · 61% at surface
Dodge County, GA 19 mi east · 6% at surface
Wilcox County, GA 19 mi south · 28% at surface
Dooly County, GA 20 mi west · 88% at surface
Crisp County, GA 27 mi southwest · 50% at surface

Which formation it is

The largest mapped soluble unit here is the Suwannee Limestone and its residuum (limestone), Oligocene in age, covering about 69% of the county. Next is the Eocene undifferentiated at 21%.

Against the rest of Georgia

Pulaski County ranks 9 of 159 in Georgia for soluble rock at the surface, and sits above 92% of US counties on that measure.