Sinkhole risk in Grant County, AR: Pockets of it

Pockets of it

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

On soluble rock: 23%
At or near the surface: 23%
Buried under cover: 0%

What to do about a house in Grant County

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 145 of Grant County's 632 square miles on soluble rock, 145 of them with the rock at or near the surface. With about 18,546 residents (29 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 318 map points about 1.4 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 Grant County

The nearest county rated sinkhole country is Izard County, AR, about 128 miles north. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

Dallas County, AR 26 mi southwest · 0% at surface
Jefferson County, AR 28 mi east · 14% at surface
Saline County, AR 29 mi northwest · 31% at surface
Hot Spring County, AR 30 mi west · 0% at surface
Cleveland County, AR 30 mi southeast · 33% at surface
Pulaski County, AR 34 mi north · 3% at surface

What Grant County is built on

The largest mapped soluble unit here is the Jackson Group (mixed clastic/carbonate), Late Eocene in age, covering about 23% of the county.

Against the rest of Arkansas

Grant County ranks 21 of 75 in Arkansas for soluble rock at the surface, and sits above 76% of US counties on that measure.