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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: 465

Pesticide concentrations in multiple stream matrices collected near Mead, Nebraska, 2022 Pesticide concentrations in multiple stream matrices collected near Mead, Nebraska, 2022

The AltEn bioenergy plant (Mead, Nebraska, USA) previously (2015 to 2021) generated ethanol from almost 100% unused/expired treated corn seeds. This use of treated corn seeds as a feedstock for ethanol production resulted in accumulation of large amounts of contaminated wastewater and solid residue at the plant, a portion of which was applied to surrounding farmland. To better understand...
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California Water Science Center

Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California

This dataset includes water-quality and sediment data for 647 environmental samples collected at 53 surface-water sites in Cache Creek (Cache C) watershed, Yolo County, California, between December 2009 and April 2019, and data for 190 associated quality-control samples (replicates and blanks). About 90 percent of the samples were collected at the following six primary sites that were...
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California Water Science Center

Salinas Valley Integrated Hydrologic and Reservoir Operations Model, Monterey and San Luis Obispo Counties, California Salinas Valley Integrated Hydrologic and Reservoir Operations Model, Monterey and San Luis Obispo Counties, California

The Salinas Valley Groundwater Basin in Monterey and San Luis Obispo Counties of California is a highly productive agricultural area, contributes significantly to the local economy, and provides a substantial portion of vegetables and other agricultural commodities to the Nation. Increases in agricultural development and population have put increasing demand on both surface water and...
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California Water Science Center

Abundance and Distribution of Fishes in Lower Blue Lake, Lake County, California Abundance and Distribution of Fishes in Lower Blue Lake, Lake County, California

Field data for fishes sampled using bottom and surface gill nets during daylight hours on October 22-24, 2024 in Lower Blue Lake, Lake county, California, USA. This data release includes the results of all measured environmental parameters and fish taxa included in the analysis.
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California Water Science Center

Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project

The U.S. Geological Survey collected groundwater samples from 44 wells used for domestic and small system drinking water supplies in the western Central Valley, California in 2023. The wells were sampled for the Western Central Valley domestic-supply aquifer study unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin...
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California Water Science Center

Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2024 Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2024

This dataset includes fish population and habitat data collected in 2024 to support development of the upper Santa Ana River Habitat Conservation Plan for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcuttii) in the Santa Ana River, California.
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California Water Science Center

Upper Feather River Watershed 30-meter Basin Characterization Model - Monthly Historical Climate and Hydrology Upper Feather River Watershed 30-meter Basin Characterization Model - Monthly Historical Climate and Hydrology

Note: This data release has been deprecated. Please see new data release here: https://doi.org/10.5066/P138MUCW. This data release includes downscaled climate inputs and hydrologic outputs from the Basin Characterization Model (BCM) version 8 (v8), described in Flint et al. (2021a), in a 30 by 30-meter spatial resolution at a monthly time step from water years 1896 to 2023 for the upper...
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California Water Science Center

Water Quality and Zooplankton Data from the Floating Wetland Experiment on Bouldin Island in the Sacramento-San Joaquin Delta, California Water Quality and Zooplankton Data from the Floating Wetland Experiment on Bouldin Island in the Sacramento-San Joaquin Delta, California

This data release includes water quality and zooplankton data collected concurrently with the Floating Wetland Experiment in the West Pond on Bouldin Island in the Sacramento-San Joaquin Delta. Data were collected to monitor water quality and zooplankton community composition before and after the installation of a floating tule wetland. The data were collected at a site near the floating...
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California Water Science Center

Historical and future simulated streamflow and sediment loads from Clear Lake tributaries in California Historical and future simulated streamflow and sediment loads from Clear Lake tributaries in California

This dataset includes simulated streamflow and sediment discharge for major tributaries contributing to Clear Lake, California. Historical hourly streamflow and sediment for each tributary location were outputs from an Hydrological Simulation Program - FORTRAN (HSPF) model. The historical data is available at an hourly time step from October 1980 to March 2024. The future time series...
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California Water Science Center

Stable Isotopes of Fish, Invertebrates, and Vegetation in the Northern Sacramento-San Joaquin Delta, California, 2022-2024 Stable Isotopes of Fish, Invertebrates, and Vegetation in the Northern Sacramento-San Joaquin Delta, California, 2022-2024

This dataset includes lab data for stable isotopes of fish tissue, invertebrates, and vegetation collected during daylight hours in the Northern Sacramento-San Joaquin Delta and drainage channels of the Yolo By-Pass, California, USA during summer 2022, 2023, and 2024. This data release includes all animal taxa and isotope values.
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California Water Science Center

Geochemical data for groundwater and surface water from the Waste Rock Dam area, Sulphur Bank Mercury Mine, Lake County, California Geochemical data for groundwater and surface water from the Waste Rock Dam area, Sulphur Bank Mercury Mine, Lake County, California

The Sulphur Bank Mercury Mine in Lake County, California, was the site of historical mercury mining from 1880s through 1973.Since 1990, the mine area has been a Superfund site managed by the U.S. Environmental Protection Agency (USEPA). As part of a Remedial Investigation, the USEPA and the U.S. Geological Survey (USGS) are collaborating on a groundwater investigation in a part of the...
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California Water Science Center

Geochemical and isotopic data for soils and sediments from the Clear Lake drainage basin, Lake County, California (ver. 2.0, August 2025) Geochemical and isotopic data for soils and sediments from the Clear Lake drainage basin, Lake County, California (ver. 2.0, August 2025)

This dataset includes geochemical, isotopic, and particle-size data for soil and sediment samples collected at approximately 500 sites in the Clear Lake drainage basin, Lake County, California, between November 2021 and December 2023. Data are also reported for ten soil samples collected during October 2018 soon after the Ranch Fire in the upper Scotts Creek watershed. Samples of lakebed...
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California Water Science Center
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