Johnson County, WY Shrink-Swell Risk

Shrink-swell potential in Johnson County, WY

Moderate

Soil across 56.2% of Johnson County, WY comes back "Moderate" in USDA's shrink-swell data, averaging 3.04% linear extensibility. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

What this number does and doesn't tell you

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

Johnson County: the real numbers

Johnson 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.

Where this sits nationally

Among the 3,085 rated counties on this site, Johnson County, WY ranks 1,174 most-constrained nationally, and 6 of 23 within Wyoming. Johnson County, WY is 4,154 square miles with a population of 8,803.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Hidalgo County, NM and Rhea County, TN 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 Wyoming

Every county in Wyoming is on this site, including Big Horn County, WY and Goshen County, WY. The full underlying dataset is downloadable directly, one row per county.