Allegan County, MI Shrink-Swell Risk

What Allegan County, MI's soil means for a foundation

Low

USDA's SSURGO data puts Allegan County, MI's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.41% across 85.4% of the county's surveyed land. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

This is a county figure, not a lot figure

USDA's survey covers the whole of Allegan County, MI 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 Allegan County will actually do.

Report cost vs. repair cost

With Allegan County, MI 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, Allegan County, MI is the 2,604-most-constrained of 3,085 rated counties for shrink-swell soil. Within Michigan alone it ranks 43 of 83. The county spans 825 square miles, home to 122,429 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Chautauqua County, NY and Dunn County, ND 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 Michigan

Every county in Michigan is on this site, including Gogebic County, MI and Oscoda County, MI. The full underlying dataset is downloadable directly, one row per county.