Sinkhole risk in Calhoun 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: 40%
At or near the surface: 40%
Buried under cover: 0%

The next step for one property

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 113 of Calhoun County's 280 square miles on soluble rock, 113 of them with the rock at or near the surface. With about 5,441 residents (19 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 343 map points about 0.9 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 Calhoun County

The nearest county rated sinkhole country is Baker County, GA, about 17 miles southeast, close enough that the same rock may run under the county line. 1 of the 6 closest counties land in the same band; the ground changes quickly around here.

Baker County, GA 17 mi southeast · 93% at surface
Randolph County, GA 18 mi northwest · 0% at surface
Terrell County, GA 21 mi northeast · 16% at surface
Early County, GA 21 mi southwest · 81% at surface
Clay County, GA 23 mi west · 1% at surface
Dougherty County, GA 25 mi east · 90% at surface

What Calhoun County is built on

The largest mapped soluble unit here is the Ocala Limestone (limestone), Eocene in age, covering about 40% of the county.

Against the rest of Georgia

Calhoun County ranks 23 of 159 in Georgia for soluble rock at the surface, and sits above 84% of US counties on that measure.