Sinkhole risk in Trigg County, KY: Sinkhole country

Sinkhole country

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

On soluble rock: 75%
At or near the surface: 75%
Buried under cover: 0%

What this means before you buy

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

That works out to roughly 330 of Trigg County's 441 square miles on soluble rock, 330 of them with the rock at or near the surface. With about 14,559 residents (33 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 273 map points about 1.3 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Trigg County

The closest county with no soluble rock mapped is Marshall County, KY, about 27 miles west. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Lyon County, KY 19 mi northwest · 58% at surface
Christian County, KY 21 mi east · 87% at surface
Caldwell County, KY 24 mi north · 74% at surface
Stewart County, TN 25 mi south · 71% at surface
Calloway County, KY 26 mi southwest · 3% at surface
Marshall County, KY 27 mi west · under 1% at surface

What Trigg County is built on

The largest mapped soluble unit here is the Ste. Genevieve and St. Louis Limestones, undivided (limestone), Mississippian in age, covering about 60% of the county. Next is the Warsaw Limestone at 10%.

Against the rest of Kentucky

Trigg County ranks 19 of 120 in Kentucky for soluble rock at the surface, and sits above 94% of US counties on that measure.