Shannon County, MO Shrink-Swell Risk
Shrink-swell potential in Shannon County, MO
Low
Soil across 89.2% of Shannon County, MO comes back "Low" in USDA's shrink-swell data, averaging 1.56% linear extensibility. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Shannon County, MO - 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).
Shannon County: the real numbers
Shannon 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.
Shannon County's rank among Missouri counties
Among the 3,085 rated counties on this site, Shannon County, MO ranks 2,436 most-constrained nationally, and 106 of 114 within Missouri. Shannon County covers 1,004 square miles and counts 7,275 residents.
Before you act on this
Orleans Parish, LA carries this site's most-constrained reading. Sherman County, OR and Texas County, OK 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 Missouri
Every county in Missouri is on this site, including Mississippi County, MO and New Madrid County, MO. The full underlying dataset is downloadable directly, one row per county.