The San Joaquin flows into the Bay Delta near Stockton, Calif.
The San Joaquin River flowing near Sacramento, Calif.
Dry San Joaquin
More than 100 miles (160 kilometers) of the San Joaquin runs dry, according to American Rivers.
The California aquaduct. About 80 percent of the state's water diversions go to agriculture.
An irrigation canal in California. Diversions take more than 70 percent of the San Joaquin's flow, according to American Rivers.
California's current drought is exacerbating water management problems. Here, a dry irrigation canal.
Drying San Joaquin
The San Joaquin slows to a trickle near San Mateo Road in the Bay Area.
Drying San Joaquin Bed
A view of the drying San Joaquin riverbed near San Mateo Road.
San Joaquin Diversions
Diversions from the San Joaquin River near Stockton, Calif.
San Joaquin and the Bay Delta
The San Joaquin River snakes through development in the Bay Delta region.
Stephanie Pappas, Live Science Contributor
Stephanie interned as a science writer at Stanford University Medical School, and also interned at ScienceNow magazine and the Santa Cruz Sentinel. She has a bachelor's degree in psychology from the University of South Carolina and a graduate certificate in science writing from the University of California, Santa Cruz.