Coos County, OR Shrink-Swell Risk

Shrink-swell potential in Coos County, OR

Low

Soil across 69.7% of Coos County, OR comes back "Low" in USDA's shrink-swell data, averaging 2.52% 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 Coos 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).

Coos County: the real numbers

Coos 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.

Coos County's rank among Oregon counties

Among the 3,085 rated counties on this site, Coos County, OR ranks 1,543 most-constrained nationally, and 23 of 36 within Oregon. Coos County covers 1,596 square miles and counts 64,326 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Carlisle County, KY and Wilson County, TN 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 Crook County, OR and Multnomah County, OR. The full underlying dataset is downloadable directly, one row per county.