Sinkhole risk in Otero County, NM: Pockets of it

Pockets of it

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

On soluble rock: 59%
At or near the surface: 59%
Buried under cover: 0%

What this means before you buy

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 3,888 of Otero County's 6,613 square miles on soluble rock, 3,888 of them with the rock at or near the surface. With about 69,711 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 313 map points about 4.6 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why gypsum and salt move faster than limestone, and the signs to look for and how an inspection works.

Counties around Otero County

The nearest county rated sinkhole country is Eddy County, NM, about 85 miles east. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

El Paso County, TX 65 mi southwest · 21% at surface
Doña Ana County, NM 66 mi west · 6% at surface
Lincoln County, NM 80 mi north · 65% at surface
Hudspeth County, TX 83 mi south · 38% at surface
Eddy County, NM 85 mi east · 41% at surface
Sierra County, NM 90 mi northwest · 16% at surface

What Otero County is built on

The largest mapped soluble unit here is the San Andres Formation (carbonate), Permian in age, covering about 33% of the county. Next is the Yesa Formation at 13%.

19% of the county sits on gypsum or salt, which dissolves in years rather than millennia. That share matters more than its size suggests.

Against the rest of New Mexico

Otero County ranks 2 of 33 in New Mexico for soluble rock at the surface, and sits above 90% of US counties on that measure.