Idaho

A few regions containing expansive clay soil are found in this state. Location and potential for damage may vary. If you have concerns consult an experienced geologist.

Adapted from the “Swelling Clays Map Of The Conterminous United States” by W.W. Olive, A.F. Chleborad, C.W. Frahme, Julius Schlocker, R.R. Schneider, and R.L Shuster; 1989

MAP LEGEND

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

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