Custer County, ID Shrink-Swell Risk

Shrink-swell potential in Custer County, ID

Low

Soil across 83.6% of Custer County, ID comes back "Low" in USDA's shrink-swell data, averaging 1.91% 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 Custer County, ID - 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).

Custer County: the real numbers

Custer 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.

Custer County's rank among Idaho counties

Among the 3,085 rated counties on this site, Custer County, ID ranks 2,065 most-constrained nationally, and 27 of 44 within Idaho. The county spans 4,922 square miles, home to 4,597 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Taylor County, IA and Pitt County, NC 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 Idaho

Every county in Idaho is on this site, including Clearwater County, ID and Fremont County, ID. The full underlying dataset is downloadable directly, one row per county.