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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

Physical and biological data linked to stratification events in Suisun Bay, CA Physical and biological data linked to stratification events in Suisun Bay, CA

This data release contains all collected data sampled during vertical stratification events, as well as during times of vertical mixing within and around Suisun Cutoff, in Suisun Bay, CA. Data were collected using a holistic approach spatially and temporally, looking at hydrodynamics, biotic compositions, and water biogeochemistry throughout the water columns at designated points in...
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California Water Science Center

Index Velocity and Stage-Area Rating Tables for Twenty-Two Monitoring Stations in the Sacramento-San Joaquin Delta Index Velocity and Stage-Area Rating Tables for Twenty-Two Monitoring Stations in the Sacramento-San Joaquin Delta

This data release contains acoustic Doppler current profiler (ADCP) configuration information, stage-area and index velocity rating tables, and associated metadata for 22 U.S. Geological Survey (USGS) flow monitoring stations in the Sacramento-San Joaquin Delta.
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California Water Science Center

Pesticide Exposure in Wet Meadows of Southeast Idaho, 2025 Pesticide Exposure in Wet Meadows of Southeast Idaho, 2025

Wet meadow habitats in southeast Idaho, which are important areas for wetland-dependent wildlife, are managed by four National Wildlife Refuges (NWR). Threats to this important, but regionally declining habitat include pesticide drift from adjacent and nearby lands. In this study, four NWRs, Camas, Minidoka, Bear Lake, and Grays Lake, are investigated for the presence of pesticides...
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California Water Science Center

Pesticide Concentrations in Tadpoles Collected from Ponds and Reservoirs near Mead, Nebraska 2022-2024 Pesticide Concentrations in Tadpoles Collected from Ponds and Reservoirs near Mead, Nebraska 2022-2024

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 evaluate the...
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California Water Science Center

Santa Ana River temperature data, Santa Ana River, California Santa Ana River temperature data, Santa Ana River, California

This data release compiles multi-year temperature datasets from the Santa Ana River, including continuous temperature records collected by USGS, San Bernardino Valley Municipal Water District, and Riverside-Corona Resource Conservation District to support analyses of spatial and temporal thermal conditions.
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California Water Science Center

Laboratory-based optical measurements for surface waters of the Upper Colorado River Basin collected during synoptic raft trips Laboratory-based optical measurements for surface waters of the Upper Colorado River Basin collected during synoptic raft trips

This data release contains optical measurements for surface water samples collected during synoptic raft trips during three different sampling events. Data collection was performed by the University of Colorado at Boulder, Colorado (CO), and the U.S. Geological Survey (USGS) in Lakewood, CO. The raft was steered in the center of the river thalweg, generally between Kremmling, Colorado...
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California Water Science Center

MODFLOW-OWHM Used to Evaluate Groundwater Sustainability Goals of the Central Valley, California MODFLOW-OWHM Used to Evaluate Groundwater Sustainability Goals of the Central Valley, California

The Central Valley Hydrologic Model version 2 (CVHM2) simulation period has been extended to the year 2100 to assess the feasibility of groundwater level sustainability goals established under California's Sustainable Groundwater Management Act (SGMA). The original CVHM2 model simulated monthly groundwater budgets from 1961 to 2019. This data release extends the simulation period to the...
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California Water Science Center

Vertical profiles of field fluorometer measurements throughout the water column of Clear Lake, Lake County, California Vertical profiles of field fluorometer measurements throughout the water column of Clear Lake, Lake County, California

Clear Lake is a 180 km2 freshwater lake located approximately 120 km northwest of Sacramento in the California Coast Range. The lake is a popular sport-fishing destination, however, there are fish consumption advisories associated with mercury (Hg) contamination for several species. The lake has three arms: a large open-water region to the northwest (Upper Arm), a smaller and narrower...
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California Water Science Center

Basin Characterization Model (BCMv8) for the Adelaida area, San Luis Obispo County, California, USA - Monthly Historical Climate and Hydrology for water years 1896-2024 Basin Characterization Model (BCMv8) for the Adelaida area, San Luis Obispo County, California, USA - Monthly Historical Climate and Hydrology for water years 1896-2024

This data release includes climate inputs and hydrologic outputs from the Basin Characterization Model (BCM) version 8 (v8), described in Flint and others (2021), in a 270 by 270-meter spatial resolution at a monthly time step from water years 1896 to 2024 for the Adelaida area of San Luis Obispo County, California. This data release includes five child items: 1. 30-year summaries, 2...
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California Water Science Center

Pesticide concentrations in moths and other insects collected from the United States and Canada, 2022 to 2024 Pesticide concentrations in moths and other insects collected from the United States and Canada, 2022 to 2024

Both aquatic and terrestrial insects can undergo complex evolutionary phases throughout their lifespan. Insects in a larval phase can accumulate and retain some chemicals, such as pesticides, throughout their various life cycles. Mature insects are often more mobile than their younger counterparts, making them able to transport pesticides over further distances. Insectivores (animals...
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California Water Science Center

California 270-meter Basin Characterization Model using Weather Generator Scenarios, Part I - Monthly Climate and Hydrology California 270-meter Basin Characterization Model using Weather Generator Scenarios, Part I - Monthly Climate and Hydrology

This data release includes the downscaled climate inputs from twenty-four Weather Generator Scenarios and hydrologic outputs using the Basin Characterization Model (BCM) version 8 (v8), described in Flint and others (2021a), with a 270 by 270-meter spatial resolution at a monthly time steps from water years 1916 to 2018 for California. The twenty-four Weather Generator scenarios are...
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California Water Science Center

Data Used to Calculate Flow Logs for Wells on Marine Corps Base Camp Pendleton, California, 2024 Data Used to Calculate Flow Logs for Wells on Marine Corps Base Camp Pendleton, California, 2024

This dataset contains velocity and flow log data collected in 2024 for water production wells (PW) located on Marine Corps Base Camp Pendleton, PW-2602 and PW-2604. Data were collected using the tracer-pulse method described in Izbicki and others (1999), in which a pulse of a rhodamine dye tracer is injected to a known depth in an operating well and the travel time of the tracer to a...
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California Water Science Center
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