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Data

Providing current data for analysis, forecasting, and research

Providing current data for analysis, forecasting, and research

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

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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

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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

California Water Data

Filter Total Items: 425

Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025 Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025

Broad-area, high-resolution, boat-based water quality mapping surveys of the Sacramento-San Joaquin Delta (Delta) were conducted in June and September of 2024. Each survey was comprised of one day of high-resolution mapping. The regions covered included Discovery Bay and Old and Middle Rivers in the South Delta Tidal Transition Zone. On each day, the route of the mapping survey was...
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California Water Science Center

Integrated Hydrological Model for Simulating the Impacts of Spring Diversions on Streamflow in the Strawberry Creek Watershed, San Bernardino County, California Integrated Hydrological Model for Simulating the Impacts of Spring Diversions on Streamflow in the Strawberry Creek Watershed, San Bernardino County, California

The Strawberry Creek watershed, situated in the San Bernardino Mountains of southern California, features a group of natural springs known as Arrowhead Springs that have been augmented with diversions in the form of sub-horizontal borings and tunnels. Understanding the impact of these structures on streamflow through groundwater capture is crucial for understanding the impacts of spring...
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California Water Science Center

Domestic self-supplied household locations, counts, and withdrawal estimates in the conterminous United States: model and dataset for decadal year 2020 Domestic self-supplied household locations, counts, and withdrawal estimates in the conterminous United States: model and dataset for decadal year 2020

The U.S. Geological Survey is developing national water-use estimates as part of a project to support water resources management in the United States. Models support a nationally consistent approach to estimating water-use, are repeatable and reusable for their stated purpose which supports efficient updates to the results and have capabilities that allow users to generate forecasts of...
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California Water Science Center

Basin-fill thickness of the Arroyos and Northeast Air Force Research Laboratory areas, Edwards Air Force Base, California Basin-fill thickness of the Arroyos and Northeast Air Force Research Laboratory areas, Edwards Air Force Base, California

This data release contains a gridded shapefile of basin-fill thickness constructed from geologic maps, gravity-derived depth to bedrock, and a digital elevation model. The data were generated by the U.S. Geological Survey under cooperative agreement with the U.S. Air Force Civil Engineer Center to characterize the hydrogeology of the Arroyos and Northeast Air Force Research Laboratory...
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California Water Science Center

Select Borehole Data for the Salton Sea area and vicinity, Imperial-Riverside-San Diego-San Bernardino Counties, CA Select Borehole Data for the Salton Sea area and vicinity, Imperial-Riverside-San Diego-San Bernardino Counties, CA

Borehole lithology data from drillers' log descriptions were compiled for the Salton Sea area and vicinity. This data will be utilized to support hydrogeologic and hydrologic investigations. Data for some parts of the Salton Sea Watershed were already compiled for other USGS reports. These included Borrego Valley (Faunt and others, 2015), and the East Mesa (Shepherd and Rosenberg, 2024)...
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California Water Science Center

Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples

This dataset is comprised of cyanotoxin concentrations from whole water cyanotoxin samples collected at water quality stations in the Sacramento-San Joaquin Delta, beginning in 2020. Cyanotoxin congeners were measured from whole water cyanotoxin samples within the cyanotoxin classes: microcystins, anatoxins, cylindrospermopsins, saxitoxins, anabaenopeptins, and nodularin. Concentrations...
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California Water Science Center

Data for Per- and Polyfluoroalkyl Substances (PFAS) in groundwater samples collected by the California Groundwater Ambient Monitoring and Assessment Priority Basin Project, 2019-2024 Data for Per- and Polyfluoroalkyl Substances (PFAS) in groundwater samples collected by the California Groundwater Ambient Monitoring and Assessment Priority Basin Project, 2019-2024

The California Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP) analyzed per-and polyfluoroalkyl substances (PFAS) in groundwater samples collected from domestic and public drinking water supply wells in California. GAMA-PBP is a cooperative program between the U.S. Geological Survey and the California State Water Resources Control Board. This...
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California Water Science Center

Water quality and nutrient data from San Joaquin River and Stockton Waterfront, April and August 2024 Water quality and nutrient data from San Joaquin River and Stockton Waterfront, April and August 2024

This dataset records diel changes to water quality parameters, nutrients, and phytoplankton biomass in the south-eastern region of the Sacramento-San Joaquin Delta. Sampling occurred in August 2024 in the Stockton Waterfront (City of Stockton, San Joaquin County, California, USA) and San Joaquin River. Data was collected from approximately 6am to 9pm Pacific Standard Time on August 6, 13...
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California Water Science Center

Russian River Integrated Hydrologic Model (RRIHM): Streamflow-Routing Package (SFR) Russian River Integrated Hydrologic Model (RRIHM): Streamflow-Routing Package (SFR)

The Russian River Watershed (RRW) covers about 1300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
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California Water Science Center

Russian River Integrated Hydrologic Model (RRIHM): Agricultural Water Use Package (AG) Russian River Integrated Hydrologic Model (RRIHM): Agricultural Water Use Package (AG)

The Russian River Watershed (RRW) covers about 1300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
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California Water Science Center

Laboratory-based optical measurements for water samples collected from Clear Lake, California Laboratory-based optical measurements for water samples collected from Clear Lake, California

Clear Lake, located within the Coast Range west of California's Central Valley, is the largest natural freshwater lake contained fully within the state. The lake has three arms: a large open-water region to the northwest (Upper Arm), a smaller and narrower region to the southeast (Lower Arm), and the smallest and narrowest region to the east (Oaks Arm). Water quality in Clear Lake is...
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California Water Science Center

Sorption Coefficients (Kd) for Perfluorooctanoic acid (PFOA) and Perfluorooctanesulfonic acid (PFOS), and supporting soil properties at a 250-meter resolution, based on 30-meter resolution data from the Polaris Soils database Sorption Coefficients (Kd) for Perfluorooctanoic acid (PFOA) and Perfluorooctanesulfonic acid (PFOS), and supporting soil properties at a 250-meter resolution, based on 30-meter resolution data from the Polaris Soils database

Per- and polyfluoroalkyl substances (PFAS) chemicals are known to strongly sorb onto soils when being transported downward through the vadose zone. The degree to which this sorption occurs depends on the length of the specific PFAS molecular chain and the properties of the soil. The properties with greatest influence on the soils PFAS sorption potential are percent silt and clay, and...
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California Water Science Center
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