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Mono Lake, California
 Mono Lake, California

Mono Lake, showing calcium carbonate “tufa tower” formations that originally formed beneath the lake but are now exposed after the water level dropped. The eastern flank of the Sierra Nevada range is shown in the background. (Photo by D. J. DePaolo.)

"Save Our Water" Logo
"Save Our Water" Logo
Cliff Palace, Mesa Verde
Cliff Palace, Mesa Verde
Donner Lake, California
Donner Lake, California

Donner Lake, Sierra Nevada Range, California (Photo taken by B. Lynn Ingram).

Dust Bowl, 1930s
Dust Bowl, 1930s
Folsom Lake
Folsom Lake
Folsom Lake, 2014
Folsom Lake, 2014
Giant Sequoia Trunk Section
Giant Sequoia Trunk Section

A cut section of a Giant Sequoia trunk from Tuolumne Grove, Yosemite National Park, California, showing AD dates of fires (photo courtesy of Thomas Swetnam, Laboratory of Tree-Ring Research, University of Arizona).

Hohokam
Hohokam
John Wesley Powell
John Wesley Powell
John Wesley Powell, 1869
John Wesley Powell, 1869
Lake Powell, 2006
Lake Powell, 2006
Lake Powell, 2009
Lake Powell, 2009
Lake Tahoe
Lake Tahoe
Marsh Sediment, San Francisco Bay
Marsh Sediment, San Francisco Bay

 Frances Malamud-Roam and Anders Noren coring marsh sediments adjacent to San Francisco Bay (Photo taken by B. Lynn Ingram)

Montezuma Well
Montezuma Well
Montezuma’s Castle
Montezuma’s Castle

Montezuma’s Castle, a cliff dwelling occupied by the Sinagua, located just north of Camp Verde in central Arizona. (Photo by B. Lynn Ingram.)

Oroville Lake, 2014
Oroville Lake, 2014
Pueblo Cliff Dwelling, Colorado
Pueblo Cliff Dwelling, Colorado

Ancient pueblo cliff dwelling at Mesa Verde, southwestern Colorado. (Photo taken by B. Lynn Ingram)

Sacramento Valley, California
Sacramento Valley, California

Frances Malamud-Roam, B. Lynn Ingram, and Christina Brady coring a small oxbow lake in the Sacramento Valley, California. (Photo taken by Anders Noren, University of Minnesota, LaCore curator.)

San Francisco Bay, California
San Francisco Bay, California

Sediment core taken by Frances Malamud-Roam and B. Lynn Ingram from beneath San Francisco Bay, California. (Photo taken by B. Lynn Ingram.)

Shasta Lake, 1965
Shasta Lake, 1965
The Colorado River
The Colorado River
West Walker River, Sierra Nevada Range
West Walker River, Sierra Nevada Range

An ancient tree stump submerged in the West Walker River, eastern Sierra Nevada. (Photo courtesy of D. J. DePaolo.)