Allen County, OH Shrink-Swell Risk

Shrink-swell potential in Allen County, OH

Moderate

Soil across 85.5% of Allen County, OH comes back "Moderate" in USDA's shrink-swell data, averaging 3.97% linear extensibility. A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Allen County, OH - 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 Allen County will actually do.

Allen County: the real numbers

Allen 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 Allen County, OH compares

Among the 3,085 rated counties on this site, Allen County, OH ranks 583 most-constrained nationally, and 18 of 88 within Ohio. Allen County covers 403 square miles and counts 100,866 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Graves County, KY and Mahnomen 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 Ohio

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