Marshall County, SD Shrink-Swell Risk

Shrink-swell potential in Marshall County, SD

Moderate

Soil across 59.2% of Marshall County, SD comes back "Moderate" in USDA's shrink-swell data, averaging 3.71% linear extensibility. A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Marshall County, SD - never a reading for one specific parcel. 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.

Marshall County: the real numbers

Marshall 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.

How Marshall County, SD compares

Among the 3,085 rated counties on this site, Marshall County, SD ranks 722 most-constrained nationally, and 47 of 66 within South Dakota. The county spans 838 square miles, home to 4,395 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Clay County, IN and Jefferson County, KS 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 South Dakota

Every county in South Dakota is on this site, including Jones County, SD and Ziebach County, SD. The full underlying dataset is downloadable directly, one row per county.