Sinkhole risk in Todd County, KY: Sinkhole country

Sinkhole country

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

On soluble rock: 91%
At or near the surface: 91%
Buried under cover: 0%

The next step for one property

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

That works out to roughly 339 of Todd County's 375 square miles on soluble rock, 339 of them with the rock at or near the surface. With about 12,757 residents (34 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 327 map points about 1.1 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 Todd County

The closest county with no soluble rock mapped is Hopkins County, KY, about 38 miles northwest. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Logan County, KY 17 mi east · 93% at surface
Christian County, KY 17 mi west · 87% at surface
Montgomery County, TN 26 mi southwest · 94% at surface
Muhlenberg County, KY 26 mi north · 4% at surface
Robertson County, TN 28 mi southeast · 92% at surface
Simpson County, KY 34 mi east · 99% at surface

Which formation it is

The largest mapped soluble unit here is the Ste. Genevieve and St. Louis Limestones, undivided (limestone), Mississippian in age, covering about 41% of the county. Next is the Rocks of Chesterian age, lower part at 38%.

Against the rest of Kentucky

Todd County ranks 7 of 120 in Kentucky for soluble rock at the surface, and sits above 97% of US counties on that measure.