Roscommon County, MI Shrink-Swell Risk
Shrink-swell potential in Roscommon County, MI
Low
Soil across 95.5% of Roscommon County, MI comes back "Low" in USDA's shrink-swell data, averaging 0.99% linear extensibility. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Roscommon County, MI - 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 Roscommon County will actually do.
Roscommon County: the real numbers
Roscommon 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.
Where this sits nationally
Among the 3,085 rated counties on this site, Roscommon County, MI ranks 2,899 most-constrained nationally, and 65 of 83 within Michigan. Roscommon County, MI is 520 square miles with a population of 23,932.
Before you act on this
Orleans Parish, LA carries this site's most-constrained reading. Susquehanna County, PA and Shasta County, CA 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 Michigan
Every county in Michigan is on this site, including Antrim County, MI and Alpena County, MI. The full underlying dataset is downloadable directly, one row per county.