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California's largest storms, such as the atmospheric river events happening now, unleash torrential rain and intense winds, posing significant challenges to infrastructure and triggering widespread flooding. Photos in carousal above by Travis Apo, hydrologist and Anthony Smith, physical scientist

We conduct hydrologic monitoring and investigative studies in partnership with Federal, State, and local agencies to assist them in managing California's water resources.

Local, state, and federal agencies partner with the USGS through cooperative agreements to gain understanding of a variety of hydrogeologic issues that have broad public relevance.

Thanks for visiting our USGS California Water Science Center website.