Sinkhole risk in Faulk County, SD: No soluble rock mapped
No soluble rock mapped
No soluble bedrock mapped.
- On soluble rock
- under 1%
- At or near the surface
- 0%
- Buried under cover
- under 1%
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.
That works out to roughly 5 of Faulk County's 982 square miles on soluble rock. With about 2,136 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 403 map points about 1.6 miles apart, so a pocket smaller than that can be missed or overstated.
Read next: how these percentages are measured, and the warning signs that apply anywhere.
Counties around Faulk County
The nearest county rated sinkhole country is Boyd County, NE, about 151 miles south. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.
- Edmunds County, SD 24 mi north · 0% at surface
- Hand County, SD 37 mi south · 0% at surface
- Potter County, SD 39 mi west · 0% at surface
- Hyde County, SD 40 mi southwest · 0% at surface
- Spink County, SD 41 mi east · 0% at surface
- Walworth County, SD 49 mi northwest · 0% at surface
The rock underneath
The largest mapped soluble unit here is the Niobrara Formation (limestone), Late Cretaceous in age, covering about under 1% of the county.
Against the rest of South Dakota
Faulk County ranks 30 of 66 in South Dakota for soluble rock at the surface, and sits above 0% of US counties on that measure.
- Lawrence County 42%
- Fall River County 37%
- Custer County 30%
- Gregory County 17%
- Pennington County 13%