Sinkhole risk in Carroll County, NH: 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 932 square miles, under one square mile of Carroll County maps onto soluble rock. With about 52,580 residents (56 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 606 map points about 1.2 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 Carroll County

The nearest county rated sinkhole country is Union County, PA, about 360 miles southwest. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Belknap County, NH 27 mi southwest · 0% at surface
Grafton County, NH 32 mi west · 0% at surface
York County, ME 41 mi southeast · 0% at surface
Strafford County, NH 41 mi south · 0% at surface
Cumberland County, ME 44 mi east · 0% at surface
Merrimack County, NH 46 mi southwest · 0% at surface

Against the rest of New Hampshire

Carroll County ranks 2 of 10 in New Hampshire for soluble rock at the surface, and sits above 0% of US counties on that measure.