US Soil Map & Swell Potential Of Reactive Soils

[jbiehl]

Unit contains abundant clay having high swelling potential
Part of unit (generally less than 50%) consists of clay having high swelling potential
Unit contains abundant clay having slight to moderate swelling potential
Part of unit (generally less than 50%) consists of clay having slight to moderate swelling potential
Unit contains little or no swelling clay
Data insufficient to indicate clay content of unit and/or swelling potential of clay (Shown in westermost states only)

To get a closer look at certain areas, you can visit here http://www.surevoid.com/soil_maps/risk_areas_us.php

[MountainDon]

There is also the Web Soil Survey site that is interactive. Data not available for all areas; our place in the mountains for example. It's too variable from one valley or ridge to another.

I thought we had a referral topic but all I can find is that it pops up here and there in assorted topics. Refer to...

http://countryplans.com/smf/index.php?topic=10057.0

and directly to the WSS itself...

http://websoilsurvey.nrcs.usda.gov/app/