San Juan County, CO Shrink-Swell Risk
Shrink-swell potential in San Juan County, CO
Low
Soil across 77.9% of San Juan County, CO comes back "Low" in USDA's shrink-swell data, averaging 2.12% 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 San Juan County, CO - never a reading for one specific parcel. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in San Juan County will actually do.
San Juan County: the real numbers
San Juan 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.
How San Juan County, CO compares
Among the 3,085 rated counties on this site, San Juan County, CO ranks 1,879 most-constrained nationally, and 39 of 63 within Colorado. San Juan County covers 388 square miles and counts 821 residents.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Clearwater County, ID and Catoosa County, GA 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 Colorado
Every county in Colorado is on this site, including Gilpin County, CO and Elbert County, CO. The full underlying dataset is downloadable directly, one row per county.