Sinkhole risk in Petroleum 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%

The next step for one property

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

Across 1,656 square miles, under one square mile of Petroleum County maps onto soluble rock. With about 525 residents (0 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 266 map points about 2.5 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Petroleum County

The nearest county rated sinkhole country is Fall River County, SD, about 355 miles southeast. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Musselshell County, MT 45 mi south · 0% at surface
Fergus County, MT 48 mi west · 12% at surface
Garfield County, MT 58 mi east · 0% at surface
Golden Valley County, MT 69 mi southwest · 4% at surface
Treasure County, MT 78 mi southeast · 0% at surface
Phillips County, MT 78 mi north · under 1% at surface

Against the rest of Montana

Petroleum County ranks 46 of 56 in Montana for soluble rock at the surface, and sits above 0% of US counties on that measure.