Grundy County, MO Shrink-Swell Risk
Shrink-swell potential in Grundy County, MO
High
Soil across 49.3% of Grundy County, MO comes back "High" in USDA's shrink-swell data, averaging 6.19% linear extensibility. Ground like this needs active moisture control to keep a conventional foundation from cracking - it's not automatic either way.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Grundy 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).
Grundy County: the real numbers
Given Grundy County's rating, spending a few thousand now is the way to avoid spending tens of thousands later. A geotechnical report runs $1,000-$5,000 (typically $2,700); an actual foundation repair, once cracking sets in, typically runs $5,000-$15,000 (around $10,000 typical) - roughly 4x the report.
Where this sits nationally
Among the 3,085 rated counties on this site, Grundy County, MO ranks 107 most-constrained nationally, and 11 of 114 within Missouri. Grundy County, MO is 435 square miles with a population of 9,766.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Jefferson County, IL and Charlton County, GA are worth a look for comparison.
How this reading is built, and its real limits · The warning signs of expansive-clay damage, explained
Elsewhere in Missouri
Every county in Missouri is on this site, including Oregon County, MO and Bollinger County, MO. The full underlying dataset is downloadable directly, one row per county.