Sinkhole risk in Platte County, NE: Pockets of it

Pockets of it

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

On soluble rock: 64%
At or near the surface: 19%
Buried under cover: 45%

What to do about a house in Platte County

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 433 of Platte County's 675 square miles on soluble rock, 126 of them with the rock at or near the surface. With about 35,499 residents (53 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 326 map points about 1.4 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Platte County

The nearest county rated sinkhole country is Knox County, NE, about 76 miles north. 1 of the 6 closest counties land in the same band; the ground changes quickly around here.

Colfax County, NE 22 mi east · 0% at surface
Madison County, NE 24 mi north · 4% at surface
Polk County, NE 27 mi south · 2% at surface
Nance County, NE 28 mi southwest · 31% at surface
Stanton County, NE 29 mi northeast · 0% at surface
Boone County, NE 30 mi west · 0% at surface

What Platte County is built on

The largest mapped soluble unit here is the Niobrara Formation (limestone), Late Cretaceous in age, covering about 64% of the county.

Against the rest of Nebraska

Platte County ranks 18 of 93 in Nebraska for soluble rock at the surface, and sits above 74% of US counties on that measure.