Sinkhole risk in Jack 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: 23%
At or near the surface: 23%
Buried under cover: 0%

What to do about a house in Jack 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 205 of Jack County's 911 square miles on soluble rock, 205 of them with the rock at or near the surface. With about 9,398 residents (10 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 396 map points about 1.5 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 Jack County

The nearest county rated sinkhole country is Baylor County, TX, about 65 miles northwest. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Young County, TX 30 mi west · 2% at surface
Wise County, TX 30 mi east · 24% at surface
Palo Pinto County, TX 34 mi south · 39% at surface
Parker County, TX 38 mi southeast · 21% at surface
Clay County, TX 38 mi north · 0% at surface
Archer County, TX 40 mi northwest · 0% at surface

What Jack County is built on

The largest mapped soluble unit here is the Home Creek Limestone and Colony Creek Shale, undivided (shale), Pennsylvanian; Missouri Series in age, covering about 10% of the county. Next is the Ranger Limestone and Placid Creek Shale, undivided at 6%.

Against the rest of Texas

Jack County ranks 98 of 254 in Texas for soluble rock at the surface, and sits above 76% of US counties on that measure.