California Expansive Soils Map
‹ Return to Where to Find Expansive Soils in California
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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