Sinkhole risk in Cheyenne County, CO: Not karst, but voids possible

Not karst, but voids possible

No soluble bedrock; some pseudokarst (piping or lava-tube ground).

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

The next step for one property

Not true karst, but soil piping or lava tubes can still open voids - mention it to an inspector.

Across 1,778 square miles, under one square mile of Cheyenne County maps onto soluble rock. With about 1,712 residents (1 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 384 map points about 2.2 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 how ground with no limestone still opens up.

Counties around Cheyenne County

The nearest county rated sinkhole country is Clark County, KS, about 188 miles southeast. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

Kiowa County, CO 32 mi south · 30% at surface
Kit Carson County, CO 32 mi north · 0% at surface
Wallace County, KS 45 mi east · 23% at surface
Greeley County, KS 49 mi southeast · 7% at surface
Lincoln County, CO 50 mi west · 0% at surface
Sherman County, KS 59 mi northeast · 9% at surface

Against the rest of Colorado

Cheyenne County ranks 45 of 64 in Colorado for soluble rock at the surface, and sits above 0% of US counties on that measure.