Sitka City and Borough, AK Shrink-Swell Risk
Sitka City and Borough, AK has no shrink-swell rating on file
Unrated
This county has no matching soil survey data - too rare a gap to guess at. A local geotechnical report is the only way to know. Sitka City and Borough, AK covers 2,870 square miles and is home to 8,355 people, but the dominant soil here carries no SSURGO linear-extensibility data to report.
What Sitka City and Borough's reading doesn't cover
Two lots a mile apart in Sitka City and Borough can carry different soil, even though they share one countywide reading. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Sitka City and Borough will actually do.
What it costs to find out, versus to ignore it
With no SSURGO reading to go on, Sitka City and Borough has no county-level steer either way on foundation risk. A geotechnical report typically runs $1,000-$5,000; a real foundation repair, if it comes to that, runs $5,000-$15,000. The report is the cheap way to find out first.
Before you act on this
Orleans Parish, LA carries this site's most-constrained reading. Hillsdale County, MI and Burnet County, TX 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 Alaska
Every county in Alaska is on this site, including Dillingham Census Area, AK and Denali Borough, AK. The full underlying dataset is downloadable directly, one row per county.