California Water Science Center

Data and Tools

Basic hydrologic data collection, processing, analysis, dissemination, and archiving are major parts of the California Water Science Center program. Streamflow data, for example, are used for flood and water-supply forecasts, planning and design, river regulation, streamflow statistics, and research investigations. Much of the data are available on a near-real-time basis by satellite telemetry.

California Water Dashboard

California Water Dashboard

View California's real-time stream, lake, reservoir, precipitation, water quality, and groundwater stations in context with current weather and hazard conditions.

Current Conditions

California Groundwater Quality

California Groundwater Quality

This interactive webmap plots water-quality data from domestic and public-supply wells sampled by the USGS for the California GAMA Priority Basin Project, and allows users to download datasets.

Water Quality Data
Filter Total Items: 292
Date published: September 28, 2021

California Wildfires

Wildfires pose significant threat in an increasingly arid California landscape, threatening life, property, and air quality, and having long-term impacts on the state's water. Knowing the location and extent of wildfires may help scientists and resource managers predict and manage potential impacts burns may have upon California's water quality, availability, and movement.

Date published: September 28, 2021

MODFLOW-USG model used to evaluate water management issues in the Los Angeles Coastal Plain, California

The Los Angeles Coastal Plain Groundwater Model predicts water levels under future water-management scenarios, base case wet and dry scenarios, increased pumpage wet and dry scenarios, and optimized replenishment wet and dry scenarios.

Date published: June 5, 2021

Grid Cells and Modeled Groundwater Levels to Characterize Hydrologic Conditions for Public-supply Aquifers in California's Central Valley, 1990-2020

This data release documents grid cells and modeled groundwater levels for hydrologic characterization of aquifer areas used for public drinking-water supply in California’s Central Valley from 1990 to 2020.

Date published: June 2, 2021

Interferometric Synthetic Aperture Radar Data, Mojave River and Morongo Groundwater Basins, Southwestern Mojave Desert, California, 2014-19

Synthetic aperture radar (SAR) data from the European Space Agency's (ESA) Sentinel-1A satellite were acquired for this study from the Alaska Satellite Facility (ASF) and used to generate spatially detailed land-surface deformation maps (interferograms) for the Mojave River and Morongo groundwater basins during 2014–19 using InSAR methods.

Date published: May 27, 2021

Erodibility Data from Gust Erosion Chamber Experiments in Grizzly Bay and San Pablo Bay, California, Winter 2020

A Gust erosion chamber was used to apply horizontal shear stress to sediment cores obtained from San Pablo and Grizzly (within Suisun) Bays in California. A pair of sediment cores were collected from the same approximate locations in each bay five times between January 22nd, 2020 and March 11th, 2020 for a total of 10 experiments and 20 sediment core results.

Date published: May 27, 2021

Acoustic doppler current profiler (ADCP) transect data at Benicia Bridge and Mallard Island, 2019

Field observations of water and suspended-sediment fluxes were conducted at Benicia Bridge and Mallard Island during the 2019 water year wet season to capture suspended-sediment flux during elevated Sacramento-San Joaquin Delta discharge.

Date published: May 20, 2021

Water Quality data compiled for Groundwater development leads to decreasing arsenic concentrations in the San Joaquin Valley, California

Groundwater arsenic concentrations in the San Joaquin Valley have varied over the decades from 1980 to 2019. This report was compiled to determine whether arsenic concentrations are increasing or decreasing and the mechanism controlling the trends.

Date published: May 20, 2021

Bay-Delta Water Quality Survey, 2018 and 2020 Comparison

Delta Survey Data Visualization Contents for 2018 and 2020

Date published: April 27, 2021

From Snow to Flow

A majority of the water in the western U.S. comes from snowmelt, but changes in the timing, magnitude, and duration of snowmelt can alter water availability downstream. This data visualization story explores what changing snowmelt means for water in the West, and how new USGS efforts can advance snow science by modeling snowpack and snowmelt dynamics and linking these results to streamflow....

Date published: April 22, 2021

Airborne thermal infrared imagery and longitudinal stream temperature profiles, Hat Creek, California, August 2018

This dataset includes georeferenced high-resolution, airborne thermal infrared (TIR) imagery, a polyline shapefile of the channel centerline, and a tabular file with longitudinal stream temperature profiles for Hat Creek, a tributary to the Pit River located in northeastern California.

Date published: April 21, 2021

Hydrologic data in Hinkley and Water Valleys, San Bernardino County, California, 2015-2018

Data were collected to help define hydrologic controls on groundwater movement as part of a U.S. Geological Survey (USGS) study on background concentrations of hexavalent chromium in groundwater aquifers near Hinkley, California. Most data associated with the background study are available through the National Water Information System (NWIS) website, and GeoLog Locator.