Sinkhole risk in Belknap 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%

What to do about a house in Belknap County

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

Across 402 square miles, under one square mile of Belknap County maps onto soluble rock. With about 65,257 residents (162 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 519 map points about 0.9 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Belknap County

The nearest county rated sinkhole country is Union County, PA, about 338 miles southwest. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Merrimack County, NH 20 mi southwest · 0% at surface
Strafford County, NH 25 mi southeast · 0% at surface
Carroll County, NH 27 mi northeast · 0% at surface
Grafton County, NH 35 mi northwest · 0% at surface
York County, ME 38 mi east · 0% at surface
Rockingham County, NH 40 mi southeast · 0% at surface

Against the rest of New Hampshire

Belknap County ranks 1 of 10 in New Hampshire for soluble rock at the surface, and sits above 0% of US counties on that measure.