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Severe flooding in the mountainous region of northern California has produced texturally and morphologically distinct gravel deposits. Observations of the erosion and deposition produced by the devastating floods of December 1964 allowed comparison and identification of ancient flood deposits. Age limitations have been assigned to these ancient floods at four widely scattered detailed study sites in northern California. Long-lived coniferous trees, both living and those killed by the 1964 floods, have been used to assign minimum ages to these deposits. Maximum ages have been determined on the basis of radiocarbon dating of material entrained in the same deposits. Regional extension of standard flood frequencies is not attempted. Comparison with historic records at the four detailed study sites suggests that severe floods of magnitude similar to that of December 1964 have occurred several times in the last

Historic flood information for northern California streams from geological and botanical evidence