Sinkhole risk in Day County, SD: 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 Day County

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

Across 1,028 square miles, under one square mile of Day County maps onto soluble rock. With about 5,408 residents (5 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 385 map points about 1.6 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 Day County

The nearest county rated sinkhole country is Boyd County, NE, about 180 miles south. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

Marshall County, SD 26 mi north · 0% at surface
Codington County, SD 33 mi southeast · 0% at surface
Clark County, SD 35 mi south · 0% at surface
Roberts County, SD 36 mi northeast · 0% at surface
Brown County, SD 41 mi northwest · 0% at surface
Grant County, SD 41 mi east · 0% at surface

Against the rest of South Dakota

Day County ranks 25 of 66 in South Dakota for soluble rock at the surface, and sits above 0% of US counties on that measure.