Harper County, OK Shrink-Swell Risk

What Harper County, OK's soil means for a foundation

Low

USDA's SSURGO data puts Harper County, OK's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.91% across 86.7% of the county's surveyed land. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

This is a county figure, not a lot figure

USDA's survey covers the whole of Harper County, OK at once, not any single address. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Harper County.

Report cost vs. repair cost

With Harper County, OK rating "Low", 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.

Where this sits nationally

Nationally, Harper County, OK is the 2,066-most-constrained of 3,085 rated counties for shrink-swell soil. Within Oklahoma alone it ranks 70 of 77. The county spans 1,039 square miles, home to 3,209 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Power County, ID and Calumet 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

More of Oklahoma

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