Granite County, MT Shrink-Swell Risk

Shrink-swell potential in Granite County, MT

Low

Soil across 74.9% of Granite County, MT comes back "Low" in USDA's shrink-swell data, averaging 2.49% linear extensibility. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Granite 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).

Granite County: the real numbers

Granite 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 Granite County, MT compares

Among the 3,085 rated counties on this site, Granite County, MT ranks 1,577 most-constrained nationally, and 37 of 54 within Montana. The county spans 1,727 square miles, home to 3,602 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Wheeler County, GA and Louisa County, VA 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 Dawson County, MT and McCone County, MT. The full underlying dataset is downloadable directly, one row per county.