Ottawa County, OK Shrink-Swell Risk

Ottawa County, OK's soil, for shrink-swell risk

Moderate

Ottawa County, OK: USDA's soil survey rates 49.4% of the county "Moderate" for shrink-swell potential (3.23% 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 Ottawa County's reading doesn't cover

Two lots a mile apart in Ottawa County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

What it costs to find out, versus to ignore it

With Ottawa County, OK rating "Moderate", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. 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 Ottawa County, OK compares

Nationally, Ottawa County, OK is the 1,023-most-constrained of 3,085 rated counties for shrink-swell soil. Within Oklahoma alone it ranks 41 of 77. Ottawa County covers 471 square miles and counts 30,404 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Wilson County, TN and Fannin 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

More of Oklahoma

Every county in Oklahoma is on this site, including Major County, OK and Okmulgee County, OK. The full underlying dataset is downloadable directly, one row per county.