Sinkhole risk in Cache County, UT: Pockets of it

Pockets of it

Soluble rock at the surface or under thin cover in part of the county.

On soluble rock: 41%
At or near the surface: 41%
Buried under cover: 0%

The next step for one property

Check the parcel against your state survey sinkhole map, and ask for an inspection if cracks, depressions or sticking doors show up.

That works out to roughly 476 of Cache County's 1,165 square miles on soluble rock, 476 of them with the rock at or near the surface. With about 145,487 residents (125 per square mile), homes are spread across towns and farmland, and a mapped unit may or may not reach the developed parts. The figures come from 274 map points about 2.1 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: the signs to look for and how an inspection works, and how these percentages are measured.

Counties around Cache County

The nearest county rated sinkhole country is Emery County, UT, about 196 miles south. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Rich County, UT 27 mi east · 9% at surface
Franklin County, ID 31 mi north · 37% at surface
Weber County, UT 33 mi south · 9% at surface
Bear Lake County, ID 44 mi northeast · 45% at surface
Morgan County, UT 45 mi south · 9% at surface
Oneida County, ID 51 mi northwest · 44% at surface

The rock underneath

The largest mapped soluble unit here is the Middle Cambrian shale and carbonate rocks in Logan-Huntsville Allochthon (dolostone (dolomite)), Middle Cambrian in age, covering about 9% of the county. Next is the Upper Cambrian carbonate rocks in Logan-Huntsville Allochthon at 7%.

Against the rest of Utah

Cache County ranks 1 of 29 in Utah for soluble rock at the surface, and sits above 84% of US counties on that measure.