Sinkhole risk in Coryell County, TX: Pockets of it

Pockets of it

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

On soluble rock: 35%
At or near the surface: 35%
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 372 of Coryell County's 1,052 square miles on soluble rock, 372 of them with the rock at or near the surface. With about 86,370 residents (82 per square mile), homes are spread across towns and farmland, and a mapped unit may or may not reach the developed parts. The figures come from 540 map points about 1.4 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: the signs to look for and how an inspection works, and how these percentages are measured.

Counties around Coryell County

The nearest county rated sinkhole country is Runnels County, TX, about 132 miles west. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Hamilton County, TX 29 mi northwest · 34% at surface
Lampasas County, TX 29 mi southwest · 57% at surface
Bell County, TX 31 mi southeast · 32% at surface
Bosque County, TX 36 mi north · 26% at surface
McLennan County, TX 37 mi east · 41% at surface
Mills County, TX 48 mi west · 16% at surface

What Coryell County is built on

The largest mapped soluble unit here is the Paluxy Sand and Glen Rose Limestone, undivided (sandstone), Early Cretaceous in age, covering about 17% of the county. Next is the lower part of Washita Group at 10%.

Against the rest of Texas

Coryell County ranks 75 of 254 in Texas for soluble rock at the surface, and sits above 82% of US counties on that measure.