Sinkhole risk in Colfax County, NE: No soluble rock mapped

No soluble rock mapped

No soluble bedrock mapped.

On soluble rock: under 1%
At or near the surface: 0%
Buried under cover: under 1%

What this means before you buy

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

That works out to roughly 1 of Colfax County's 411 square miles on soluble rock. With about 10,826 residents (26 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 367 map points about 1.1 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 Colfax County

The nearest county rated sinkhole country is Knox County, NE, about 84 miles northwest. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Platte County, NE 22 mi west · 19% at surface
Dodge County, NE 23 mi east · 0% at surface
Stanton County, NE 23 mi north · 0% at surface
Butler County, NE 24 mi south · 0% at surface
Cuming County, NE 28 mi northeast · 0% at surface
Saunders County, NE 34 mi southeast · 0% at surface

Which formation it is

The largest mapped soluble unit here is the Niobrara Formation (limestone), Late Cretaceous in age, covering about under 1% of the county.

Against the rest of Nebraska

Colfax County ranks 48 of 93 in Nebraska for soluble rock at the surface, and sits above 0% of US counties on that measure.