Gallia County, OH Shrink-Swell Risk

Shrink-swell potential in Gallia County, OH

Moderate

Soil across 70% of Gallia County, OH comes back "Moderate" in USDA's shrink-swell data, averaging 3.39% linear extensibility. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Gallia County, OH - never a reading for one specific parcel. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Gallia County.

Gallia County: the real numbers

Gallia 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.

Gallia County's rank among Ohio counties

Among the 3,085 rated counties on this site, Gallia County, OH ranks 914 most-constrained nationally, and 37 of 88 within Ohio. The county spans 467 square miles, home to 28,886 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Warren County, IN and Dawson County, GA 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 Ohio

Every county in Ohio is on this site, including Wood County, OH and Montgomery County, OH. The full underlying dataset is downloadable directly, one row per county.