Sinkhole risk in Logan County, IL: 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 618 square miles, under one square mile of Logan County maps onto soluble rock. With about 27,518 residents (45 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 364 map points about 1.3 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 Logan County
The nearest county rated sinkhole country is Calhoun County, IL, about 96 miles southwest. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.
- Menard County, IL 24 mi west · 0% at surface
- De Witt County, IL 25 mi east · 0% at surface
- Tazewell County, IL 27 mi north · 0% at surface
- Macon County, IL 28 mi southeast · 0% at surface
- Mason County, IL 30 mi west · 0% at surface
- Sangamon County, IL 30 mi southwest · 0% at surface
Against the rest of Illinois
Logan County ranks 68 of 102 in Illinois for soluble rock at the surface, and sits above 0% of US counties on that measure.
- Hardin County 61%
- Jo Daviess County 58%
- Union County 53%
- Calhoun County 51%
- Alexander County 31%