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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: 486

Velocity mapping using moving boat and side-looking acoustic Doppler current profilers at False River, CA in February and March 2022 Velocity mapping using moving boat and side-looking acoustic Doppler current profilers at False River, CA in February and March 2022

Moving boat (MB) acoustic Doppler current profile (ADCP) measurements collected at discrete cross-sections over an ~1.5 kilometer stretch of False River, near the San Joaquin River, CA. These data were collected on four separate days in March of 2022, and are georeferenced and depth-averaged. Side looking (SL) ADCP data was also georeferenced to provide an index for the moving boat ADCP
By
California Water Science Center

Up-looking acoustic Doppler current profiler data from Suisun Bay and lower Sacramento River, CA from June 2021 - August 2023 Up-looking acoustic Doppler current profiler data from Suisun Bay and lower Sacramento River, CA from June 2021 - August 2023

These data along with continuous monitoring at several locations (data provided through NWIS) are used to monitor bottom salinity and tidal currents associated with a project to better monitor X2 (position of 2 PSU [Practical Salinity Units] isohaline) in the lower Sacramento River and Suisun Bay, CA. Links to NWIS sites are provided in the associated web links under 'Related External...
By
California Water Science Center

Growth, survival, and tag retention results from PIT tagging Santa Ana Sucker in a mesocosm experiment Growth, survival, and tag retention results from PIT tagging Santa Ana Sucker in a mesocosm experiment

The Santa Ana Sucker (Pantosteus santaanae) is a federally threatened species of ray-finned fishes endemic to the Santa Ana, San Gabriel, and Los Angeles Rivers in southern California. Seasonal limitations on conventional sampling and inconsistencies in survey methodologies have led to an incomplete understanding of Santa Ana Sucker population dynamics. Therefore, alternative sampling...
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California Water Science Center

Stable Isotope Concentrations in Native Fish Tissues Sampled on November 19, 2019, from the Santa Ana River, near Colton, California (ver. 1.1, September 2025) Stable Isotope Concentrations in Native Fish Tissues Sampled on November 19, 2019, from the Santa Ana River, near Colton, California (ver. 1.1, September 2025)

This dataset includes carbon-13 (d13C) and nitrogen-15 (d15N) stable isotope analysis from muscle, fin, and eye lens (laminae) tissues from Santa Ana sucker (Pantosteus santaanae) and arroyo chub (Gila orcutti) collected by the Riverside Corona Resource Conservation District (RCRCD) during a fish salvage effort in the Santa Ana River, near Colton, California, USA, on November 19, 2019...
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California Water Science Center

Geochemical data for selected streams in the Clear Lake basin, Lake County, California (ver. 2.0, March 2026) Geochemical data for selected streams in the Clear Lake basin, Lake County, California (ver. 2.0, March 2026)

This dataset includes water-quality data collected at 16 sites in the Clear Lake Drainage Basin, Lake County, California, between November 2018 and March 2025. Sampling targeted high-flow events following rainfall and baseline conditions during the wet season (typically December through April) across multiple water years (WYs), with expanded coverage in WYs 2022–2024 and new data added...
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California Water Science Center

Data for assessing the susceptibility of groundwater used for domestic-supply, California (ver. 2.0, July 2026) Data for assessing the susceptibility of groundwater used for domestic-supply, California (ver. 2.0, July 2026)

This dataset provides groundwater age estimates for 257 wells used as domestic supply in six selected areas of California. Groundwater ages were estimated by calibration of environmental tracers (tritium, tritiogenic helium-3, sulfur hexafluoride, carbon-14 and radiogenic helium-4) to lumped parameter models (LPMs). Calibrated lumped parameter models provide the optimal mean age and...
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California Water Science Center

GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California

In the San Antonio Creek Valley Watershed (SACVW) of Santa Barbara County, California, climatic conditions, surface-water diversions, and groundwater withdrawals potentially affect water availability, magnitude of streamflow in San Antonio Creek, and the extent and quality of protected species habitat in the Barka Slough wetland. Future climate in central California may have warmer and...
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California Water Science Center

Development and efficiency of less intrusive survey methodologies for Santa Ana sucker (Pantosteus santaanae) monitoring Development and efficiency of less intrusive survey methodologies for Santa Ana sucker (Pantosteus santaanae) monitoring

The Santa Ana Sucker (Pantosteus santaanae) is a federally threatened species endemic to the Santa Ana, San Gabriel, and Los Angeles Rivers in southern California. Seasonal limitations on conventional sampling and inconsistencies in survey methodologies have led to an incomplete understanding of Santa Ana Sucker population dynamics. Therefore, alternative sampling methods that are not...
By
California Water Science Center

Pesticide Concentrations Measured During In-Situ Active Water Sampler Testing in Solano County, California, 2023 Pesticide Concentrations Measured During In-Situ Active Water Sampler Testing in Solano County, California, 2023

A novel U.S. Geological Survey-developed active water sampler was deployed at Ulatis Creek in Solano County, California for 24 hours from November 15, 2023 to November 16, 2023. Discrete surface water samples were collected at the start and end points of the active water sampler deployment interval for comparison to the active water sampler. Samples from the active water sampler and the...
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California Water Science Center

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...
By
California Water Science Center
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