Grays Harbor County, WA Shrink-Swell Risk

Shrink-swell potential in Grays Harbor County, WA

Low

Soil across 83.5% of Grays Harbor County, WA comes back "Low" in USDA's shrink-swell data, averaging 2.03% linear extensibility. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Grays Harbor County, WA - never a reading for one specific parcel. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Grays Harbor County: the real numbers

Grays Harbor 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.

Where this sits nationally

Among the 3,085 rated counties on this site, Grays Harbor County, WA ranks 1,956 most-constrained nationally, and 15 of 39 within Washington. Grays Harbor County covers 1,902 square miles and counts 77,893 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Tioga County, NY and Outagamie County, WI 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 Washington

Every county in Washington is on this site, including King County, WA and Klickitat County, WA. The full underlying dataset is downloadable directly, one row per county.