California Drought Report #83: California Drought History

Sierra Foothill Commentary

In seeking more information on the potential for more drought following the current floods, I ran across some additional drought information in this study:

Klamath/San Joaquin/Sacramento Hydroclimatic Reconstructions from Tree Rings, February 7, 2014, David M. Meko, Connie A. Woodhouse, and Ramzi Touchan

The reconstructed flows in the Klamath, Sacramento, and San Joaquin basins allow an assessment of the instrumental period of record, in terms of drought duration and severity, in a long-term context, The longest run of below median flow years extends to 21 consecutive years in the Klamath River reconstruction, 10 years in the Sacramento and 13 years in the San Joaquin Two intervals of 10 years are indicated in the Sacramento: late 1200s and in the 1920s-1930s. In the San Joaquin, the 13-yr run occurs in the late 1400s. The 21-yr run in the Klamath occurs in the mid- to late 1600s. Numerous periods of low…

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