Sinkhole risk in Sheridan 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 to do about a house in Sheridan County

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

Across 1,677 square miles, under one square mile of Sheridan County maps onto soluble rock. With about 3,448 residents (2 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 372 map points about 2.1 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 these percentages are measured.

Counties around Sheridan County

The nearest county rated sinkhole country is Fall River County, SD, about 382 miles south. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Roosevelt County, MT 36 mi southwest · 0% at surface
Daniels County, MT 46 mi west · 0% at surface
Divide County, ND 47 mi east · 0% at surface
Williams County, ND 53 mi southeast · 0% at surface
Richland County, MT 64 mi south · 0% at surface
McKenzie County, ND 84 mi southeast · 0% at surface

Against the rest of Montana

Sheridan County ranks 52 of 56 in Montana for soluble rock at the surface, and sits above 0% of US counties on that measure.