Sinkhole risk in McCone 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 2,642 square miles, under one square mile of McCone County maps onto soluble rock. With about 1,717 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 275 map points about 3.1 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: why gypsum and salt move faster than limestone, and how these percentages are measured.

Counties around McCone County

The nearest county rated sinkhole country is Fall River County, SD, about 323 miles south. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Dawson County, MT 47 mi southeast · 0% at surface
Richland County, MT 57 mi east · 0% at surface
Roosevelt County, MT 57 mi northeast · 0% at surface
Prairie County, MT 58 mi south · 0% at surface
Garfield County, MT 63 mi southwest · 0% at surface
Valley County, MT 65 mi northwest · 0% at surface

Against the rest of Montana

McCone County ranks 44 of 56 in Montana for soluble rock at the surface, and sits above 0% of US counties on that measure.