Sinkhole risk in Red River County, TX: Mostly deep or small

Mostly deep or small

Some soluble rock, mostly deeply buried or in a small share of the county.

On soluble rock: 8%
At or near the surface: 8%
Buried under cover: 0%

What to do about a house in Red River County

Sinkholes are uncommon here; watch for new depressions after heavy rain or leaking pipes.

That works out to roughly 79 of Red River County's 1,044 square miles on soluble rock, 79 of them with the rock at or near the surface. With about 11,696 residents (11 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 291 map points about 1.9 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Red River County

The nearest county rated sinkhole country is Cherokee County, OK, about 158 miles north. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Titus County, TX 28 mi south · 10% at surface
Lamar County, TX 30 mi west · 7% at surface
Franklin County, TX 32 mi south · 31% at surface
McCurtain County, OK 38 mi northeast · 6% at surface
Bowie County, TX 38 mi east · 24% at surface
Morris County, TX 39 mi southeast · 0% at surface

The rock underneath

The largest mapped soluble unit here is the Annona Chalk (limestone), Late Cretaceous; Gulfian Series in age, covering about 4% of the county. Next is the Midway Group, undivided at 3%.

The county also lies over the Gulf Coast salt domes, a deep salt or gypsum basin. Deep beds rarely cause surface collapse on their own, but wells and mining into them have.

Against the rest of Texas

Red River County ranks 119 of 254 in Texas for soluble rock at the surface, and sits above 66% of US counties on that measure.