Sinkhole risk in Custer County, MT: No soluble rock mapped

No soluble rock mapped

No soluble bedrock mapped.

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

What this means before you buy

No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.

Across 3,783 square miles, under one square mile of Custer County maps onto soluble rock. With about 11,964 residents (3 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 298 map points about 3.6 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Custer County

The nearest county rated sinkhole country is Fall River County, SD, about 233 miles southeast. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Prairie County, MT 38 mi north · 0% at surface
Rosebud County, MT 54 mi west · 0% at surface
Fallon County, MT 55 mi east · 0% at surface
Powder River County, MT 59 mi south · 0% at surface
Carter County, MT 72 mi southeast · 4% at surface
Dawson County, MT 76 mi northeast · 0% at surface

Against the rest of Montana

Custer County ranks 38 of 56 in Montana for soluble rock at the surface, and sits above 0% of US counties on that measure.