Mineral County, MT Shrink-Swell Risk
Mineral County, MT: no USDA soil-survey match
Unrated
Unlike most of the 3,144 counties on this site, Mineral County, MT has nothing to show: This county has no matching soil survey data - too rare a gap to guess at. A local geotechnical report is the only way to know.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Mineral County, MT - never a reading for one specific parcel. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).
Mineral County: the real numbers
Mineral County carries no dominant soil rating, so there's no shortcut here - it comes down entirely to a site-specific report. A geotechnical report typically runs $1,000-$5,000; a real foundation repair, if it comes to that, runs $5,000-$15,000. The report is the cheap way to find out first.
For contrast
Orleans Parish, LA carries this site's most-constrained reading. Ramsey County, MN and Yuba 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 Montana
Every county in Montana is on this site, including Toole County, MT and Gallatin County, MT. The full underlying dataset is downloadable directly, one row per county.