Park County, MT Shrink-Swell Risk

Shrink-swell potential in Park County, MT

Low

Soil across 78% of Park County, MT comes back "Low" in USDA's shrink-swell data, averaging 1.8% 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 Park County, MT - 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 Park County will actually do.

Park County: the real numbers

Park 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.

Park County's rank among Montana counties

Among the 3,085 rated counties on this site, Park County, MT ranks 2,173 most-constrained nationally, and 48 of 54 within Montana. Park County covers 2,802 square miles and counts 18,074 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Pleasants County, WV and Larimer County, CO 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 Ravalli County, MT and Valley County, MT. The full underlying dataset is downloadable directly, one row per county.