Marshall County, OK Shrink-Swell Risk

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

High

USDA's SSURGO data puts Marshall County, OK's soil at "High" shrink-swell potential, an area-weighted linear extensibility of 6.82% across 29.4% of the county's surveyed land. Soil at this level can crack a standard foundation without moisture-control measures - consistent watering near the foundation, correct grading, root barriers - or added structural design.

This is a county figure, not a lot figure

USDA's survey covers the whole of Marshall County, OK at once, not any single address. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Marshall County will actually do.

Report cost vs. repair cost

Marshall County's soil reading is exactly the case where a report before construction, or before cracks widen, pays for itself. The report ($1,000-$5,000) is what tells you whether Marshall County's county-level reading applies to your lot; the repair ($5,000-$15,000) is what it costs if you skip that and find out from the cracks instead.

Marshall County's rank among Oklahoma counties

Nationally, Marshall County, OK is the 84-most-constrained of 3,085 rated counties for shrink-swell soil. Within Oklahoma alone it ranks 1 of 77. Marshall County, OK is 371 square miles with a population of 16,147.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Keweenaw County, MI and Franklin County, NE are worth a look for comparison.

How this reading is built, and its real limits · The warning signs of expansive-clay damage, explained

More of Oklahoma

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