Carroll County, NH Shrink-Swell Risk

Shrink-swell potential in Carroll County, NH

Low

Soil across 97.7% of Carroll County, NH comes back "Low" in USDA's shrink-swell data, averaging 1.05% linear extensibility. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Carroll County, NH - never a reading for one specific parcel. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Carroll County will actually do.

Carroll County: the real numbers

Carroll County's soil reading points toward standard foundation practice as the likely outcome, not the exception. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.

How Carroll County, NH compares

Among the 3,085 rated counties on this site, Carroll County, NH ranks 2,871 most-constrained nationally, and 2 of 10 within New Hampshire. Carroll County covers 932 square miles and counts 52,580 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Essex County, NJ and Meeker County, MN are worth a look for comparison.

How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil

Elsewhere in New Hampshire

Every county in New Hampshire is on this site, including Sullivan County, NH and Coos County, NH. The full underlying dataset is downloadable directly, one row per county.