Lewis and Clark County, MT Shrink-Swell Risk

Lewis and Clark County's SSURGO shrink-swell reading

Low

In Lewis and Clark County, MT, 82.4% of the surveyed soil carries a "Low" shrink-swell rating, 1.99% linear extensibility on average. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

Before you rely on this for one address

Lewis and Clark County's reading is an average across the whole county, not a promise about any one lot inside it. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Lewis and Clark County will actually do.

Budgeting for Lewis and Clark County, MT

Lewis and Clark 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 Lewis and Clark County, MT compares

Among the 3,085 rated counties on this site, Lewis and Clark County, MT ranks 1,993 most-constrained nationally, and 45 of 54 within Montana. Lewis and Clark County, MT is 3,458 square miles with a population of 75,129.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Muskingum County, OH and Anchorage Municipality, AK 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 Golden Valley County, MT and Liberty County, MT. The full underlying dataset is downloadable directly, one row per county.