Fallon County, MT Shrink-Swell Risk

Shrink-swell potential in Fallon County, MT

Moderate

Soil across 55.7% of Fallon County, MT comes back "Moderate" in USDA's shrink-swell data, averaging 3.41% 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 Fallon County, MT - never a reading for one specific parcel. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Fallon County.

Fallon County: the real numbers

Fallon 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.

Fallon County's rank among Montana counties

Among the 3,085 rated counties on this site, Fallon County, MT ranks 904 most-constrained nationally, and 27 of 54 within Montana. The county spans 1,621 square miles, home to 2,946 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Brown County, OH and Rutland County, VT 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 Roosevelt County, MT and Judith Basin County, MT. The full underlying dataset is downloadable directly, one row per county.