Sinkhole risk in Fallon 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 Fallon County
No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.
Across 1,621 square miles, under one square mile of Fallon County maps onto soluble rock. With about 2,946 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 291 map points about 2.4 miles apart, so a pocket smaller than that can be missed or overstated.
Read next: why gypsum and salt move faster than limestone, and how these percentages are measured.
Counties around Fallon County
The nearest county rated sinkhole country is Fall River County, SD, about 218 miles south. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.
- Wibaux County, MT 45 mi north · 0% at surface
- Bowman County, ND 45 mi east · 0% at surface
- Slope County, ND 46 mi east · under 1% at surface
- Golden Valley County, ND 50 mi northeast · 0% at surface
- Custer County, MT 55 mi west · 0% at surface
- Carter County, MT 56 mi south · 4% at surface
Against the rest of Montana
Fallon County ranks 41 of 56 in Montana for soluble rock at the surface, and sits above 0% of US counties on that measure.
- Meagher County 49%
- Mineral County 37%
- Judith Basin County 33%
- Lincoln County 29%
- Broadwater County 27%