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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: 439

Model Archive Summary for Turbidity Derived Suspended-Sediment Concentrations at 11337190 San Joaquin River at Jersey Point, California (2015-2023) Model Archive Summary for Turbidity Derived Suspended-Sediment Concentrations at 11337190 San Joaquin River at Jersey Point, California (2015-2023)

This Model Archive Summary (MAS) describes the development of a turbidity derived suspended-sediment concentration (SSC) time-series computation model. The MAS includes all the methods and techniques used to develop the model for USGS station 11337190 San Joaquin River at Jersey Point, California. The time-series suspended-sediment concentration data are representative of the cross...
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California Water Science Center

Model Archive Summary and Time-Series Suspended-Sediment Concentrations Computed from a Surrogate Turbidity Regression at U.S. Geological Survey Station 11455420; Sacramento River at Rio Vista, California (2020 - 2023) Model Archive Summary and Time-Series Suspended-Sediment Concentrations Computed from a Surrogate Turbidity Regression at U.S. Geological Survey Station 11455420; Sacramento River at Rio Vista, California (2020 - 2023)

Continuous 15-minute time-series suspended-sediment concentration (SSC) data computed from California Department of Water Resources (CDWR) instream turbidity data with a YSI EXO multi-parameter water quality sonde. A Model Archive Summary (MAS) describes the development of a continuous 15-minute SSC time-series regression model.
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California Water Science Center

Organic Contaminants at Trespass Cannabis Grows on Federal Land in California, USA Organic Contaminants at Trespass Cannabis Grows on Federal Land in California, USA

Despite the legalization of recreational cannabis in California, illegal cultivation persists, particularly on public lands (trespass grows). These operations often divert water unlawfully and apply unauthorized chemical fertilizers and pesticides. This dataset reports the presence, and in some cases concentrations, of persistent chemicals in soil, water, and sediment in nearby streams...
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California Water Science Center

Electrical resistivity tomography at Installation Restoration Site 1119 at Camp Pendleton, San Diego County, California, 2024 Electrical resistivity tomography at Installation Restoration Site 1119 at Camp Pendleton, San Diego County, California, 2024

Marine Corps Base (MCB) Camp Pendleton is an approximately 125,000 acre facility located in coastal southern California between the Los Angeles and San Diego metropolises. Established in 1942, historical military activities on the MCB Camp Pendleton have resulted in the release of environmental contaminants at numerous sites. To mitigate the risk to human health and the environment at...
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California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2024 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2024

Zooplankton samples were collected in the summer/fall of 2024 at multiple sites in the Sacramento River, Yolo Bypass, and Cache Slough Region of California and analyzed for a suite of 160 current-use pesticides and pesticide degradates by the U.S. Geological Survey Organic Chemistry Research Laboratory. Samples were collected at two sites in the Bypass, at a comparison site on the...
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California Water Science Center

Assessing spatial variability of nutrients, phytoplankton, and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2023 High resolution mapping surveys Assessing spatial variability of nutrients, phytoplankton, and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2023 High resolution mapping surveys

Broad-area, high-resolution, boat-based water quality mapping surveys of the Sacramento-San Joaquin Delta and Suisun Bay (Delta) of California, USA were conducted under different environmental/flow conditions in May, July, and October of 2023. The spatial and temporal variability of nutrients, phytoplankton, and related water quality parameters were assessed. This dataset includes...
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California Water Science Center

Fine Scale Historical Climate and Hydrology for Sentinel Monitoring Locations in California using the Basin Characterization Model (BCM) Fine Scale Historical Climate and Hydrology for Sentinel Monitoring Locations in California using the Basin Characterization Model (BCM)

This data release includes downscaled climate inputs and hydrologic outputs from 41 Basin Characterization Models (BCM) version 8 (v8), described in Flint and others (2021), with a 10 by 10-meter spatial resolution at monthly intervals from water years 1896 to 2023. Forty-one (41) models were developed for sentinel monitoring locations in Wildlife Areas and Ecological Reserves in...
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California Water Science Center

Geochemical, mineralogical, and grain-size data for deep cores from the Cache Creek Settling Basin and streambed sediments from the Sacramento River watershed Geochemical, mineralogical, and grain-size data for deep cores from the Cache Creek Settling Basin and streambed sediments from the Sacramento River watershed

The Cache Creek Settling Basin (CCSB) is a 13.3 km2 levee-bounded sediment retention basin located at the modern terminus of Cache Creek near the eastern boundary of Yolo County, approximately two miles NE of Woodland, California. The Cache Creek Settling Basin was constructed in 1937 by the U.S. Army Corps of Engineers to trap suspended sediment from the upper Cache Creek watershed...
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California Water Science Center

Data and model for mapping groundwater total dissolved solids at the San Ardo Oil Field, Monterey County, California, USA Data and model for mapping groundwater total dissolved solids at the San Ardo Oil Field, Monterey County, California, USA

The U.S. Geological Survey (USGS) compiled and analyzed data for mapping groundwater total dissolved solids (TDS) at the San Ardo Oil Field in Monterey County, California. Data include groundwater TDS and bicarbonate concentration from oil well and groundwater well samples, formation resistivity from borehole geophysical logs, porosity from well logs and rock core samples, temperature...
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California Water Science Center

Repeat microgravity data from Anza Valley, California, 2019-2023 Repeat microgravity data from Anza Valley, California, 2019-2023

This dataset represents the network-adjusted results of relative- and absolute-gravity surveys performed from 2019 to 2023 in and near Anza Valley, California. Relative surveys were done using a Zero Length Spring, Inc. Burris relative-gravity meter. Absolute-gravity surveys were done using a Micro-g LaCoste, Inc. A-10 absolute-gravity meter. The effect of solid Earth tides and ocean...
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California Water Science Center

Quartz Valley Geologic Framework and Borehole Data Quartz Valley Geologic Framework and Borehole Data

The Quartz Valley Geologic Framework uses geologic data gathered from previous publications (Mack, 1958) and airborne electromagnetic (AEM) surveys (California Department of Water Resources, 2024) in conjunction with the well log database presented in this data release to create an understanding of the extents and thicknesses of geologic units including channel alluvium, alluvium and...
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California Water Science Center

Groundwater-quality data in the Western Slope of the Sierra Nevada Domestic-Supply Aquifer Study Unit, 2024: Results from the California GAMA Priority Basin Project (ver. 1.1, February 2026) Groundwater-quality data in the Western Slope of the Sierra Nevada Domestic-Supply Aquifer Study Unit, 2024: Results from the California GAMA Priority Basin Project (ver. 1.1, February 2026)

The U.S. Geological Survey collected groundwater samples from 38 wells used for domestic and small system drinking water supplies in the south-central Sierra Nevada region, California in 2023 and 2024. The wells were sampled for the Western Slope of the Sierra Nevada domestic-supply aquifer study unit of the California Groundwater Ambient Monitoring and Assessment Program Priority Basin...
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California Water Science Center
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