Grant County, OR Shrink-Swell Risk

Shrink-swell potential in Grant County, OR

Moderate

Soil across 57.8% of Grant County, OR comes back "Moderate" in USDA's shrink-swell data, averaging 3.13% linear extensibility. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Grant County, OR - 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).

Grant County: the real numbers

Grant 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.

Grant County's rank among Oregon counties

Among the 3,085 rated counties on this site, Grant County, OR ranks 1,094 most-constrained nationally, and 12 of 36 within Oregon. Grant County covers 4,528 square miles and counts 7,093 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Fannin County, GA and Webster Parish, LA 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 Oregon

Every county in Oregon is on this site, including Wallowa County, OR and Polk County, OR. The full underlying dataset is downloadable directly, one row per county.