Grand County, CO Shrink-Swell Risk
Grand County, CO's soil, for shrink-swell risk
Low
Grand County, CO: USDA's soil survey rates 78.9% of the county "Low" for shrink-swell potential (1.81% 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 Grand County's reading doesn't cover
Two lots a mile apart in Grand County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).
What it costs to find out, versus to ignore it
With Grand County, CO rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. 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
Nationally, Grand County, CO is the 2,162-most-constrained of 3,085 rated counties for shrink-swell soil. Within Colorado alone it ranks 45 of 63. The county spans 1,847 square miles, home to 16,154 people.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Anoka County, MN and Crittenden County, KY 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
More of Colorado
Every county in Colorado is on this site, including Custer County, CO and Prowers County, CO. The full underlying dataset is downloadable directly, one row per county.