Sinkhole risk in Merrimack 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 Merrimack County

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

Across 933 square miles, under one square mile of Merrimack County maps onto soluble rock. With about 157,869 residents (169 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 543 map points about 1.3 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Merrimack County

The nearest county rated sinkhole country is Union County, PA, about 319 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 20 mi northeast · 0% at surface
Hillsborough County, NH 27 mi south · 0% at surface
Sullivan County, NH 28 mi west · 0% at surface
Strafford County, NH 32 mi east · 0% at surface
Rockingham County, NH 36 mi southeast · 0% at surface
Cheshire County, NH 39 mi southwest · 0% at surface

Against the rest of New Hampshire

Merrimack County ranks 7 of 10 in New Hampshire for soluble rock at the surface, and sits above 0% of US counties on that measure.