St. Joseph County, MI Shrink-Swell Risk
Shrink-swell potential in St. Joseph County, MI
Low
Soil across 97.9% of St. Joseph County, MI comes back "Low" in USDA's shrink-swell data, averaging 0.93% 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 St. Joseph 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 St. Joseph County will actually do.
St. Joseph County: the real numbers
St. Joseph 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 St. Joseph County, MI compares
Among the 3,085 rated counties on this site, St. Joseph County, MI ranks 2,928 most-constrained nationally, and 67 of 83 within Michigan. St. Joseph County, MI is 501 square miles with a population of 61,171.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Chester County, PA and Asotin County, WA 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 Ontonagon County, MI and Iron County, MI. The full underlying dataset is downloadable directly, one row per county.