Sinkhole risk in Logan County, ND: No soluble rock mapped

What to do about a house in Logan County

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

Across 993 square miles, under one square mile of Logan County maps onto soluble rock. With about 1,880 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 416 map points about 1.5 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Logan County

The nearest county rated sinkhole country is Boyd County, NE, about 250 miles south. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

• McIntosh County, ND 26 mi south · 0% at surface
• Kidder County, ND 34 mi north · 0% at surface
• Emmons County, ND 37 mi west · 0% at surface
• Stutsman County, ND 43 mi northeast · 0% at surface
• LaMoure County, ND 47 mi east · 0% at surface
• McPherson County, SD 49 mi south · 0% at surface

Against the rest of North Dakota

Logan County ranks 27 of 53 in North Dakota for soluble rock at the surface, and sits above 0% of US counties on that measure.

• Cavalier County 2%
• Ransom County under 1%
• Dunn County under 1%
• Barnes County under 1%
• Slope County under 1%