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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

Baseline geomorphic map and land-surface parameters, derived from integrated topobathymetric elevation data, for the mainstem Klamath River corridor downstream of Iron Gate Dam, CA, 2018 Baseline geomorphic map and land-surface parameters, derived from integrated topobathymetric elevation data, for the mainstem Klamath River corridor downstream of Iron Gate Dam, CA, 2018

This data release includes a file geodatabase with high-resolution geospatial products that illustrate the geomorphology and various land-surface parameters along a 313-kilometer segment of the mainstem Klamath River corridor downstream of Iron Gate Dam, CA. The geospatial products were derived from topobathymetric elevation data collected to document baseline topography and bathymetry...
By
California Water Science Center

Evaluation of Hydrodynamic Mixing in Keswick Reservoir, California, 2021-22 Evaluation of Hydrodynamic Mixing in Keswick Reservoir, California, 2021-22

California's State Water Resources Control Board (SWRCB) wishes to quantify how water and constituents introduced via the outflow from the Spring Creek Diversion Dam mix with water within Keswick Reservoir. Of primary interest is the degree of dilution that exists when this introduced flow reaches the main stem of Keswick Reservoir, and how this mixing is influenced by different...
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California Water Science Center

Lower Salinas Valley Hydrologic Models: Discretization Data (ver. 1.2, August 2024) Lower Salinas Valley Hydrologic Models: Discretization Data (ver. 1.2, August 2024)

The Lower Salinas Valley Hydrologic Models’ discretization data includes a shapefile of the model domain and layers and a shapefile of the water balance subregions. The Lower Salinas Valley Hydrologic Models (LSVHM) include a historical model, the Salinas Valley Integrated Hydrologic Model (SVIHM) and a reservoir operations model, the Salinas Valley Operational Model (SVOM). While the...
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California Water Science Center

Salinas Valley Hydrologic Models: Surface Water Data (ver. 1.1, September 2024) Salinas Valley Hydrologic Models: Surface Water Data (ver. 1.1, September 2024)

This digital dataset contains the surface water data used for both the Salinas Valley Watershed Model (SVWM) and the Lower Salinas Valley Hydrologic Models (Salinas Valley Integrated Hydrologic Model (SVIHM) and Salinas Valley Operational Model (SVOM)). The surface water dataset includes describes two regions of the Salinas River Watershed; the upper region is occurs primarily within San...
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California Water Science Center

Marine Observations of Longfin Smelt Spirinchus thaleichthys in the northeast Pacific Ocean Marine Observations of Longfin Smelt Spirinchus thaleichthys in the northeast Pacific Ocean

This dataset is a compilation of Longfin Smelt observations from multiple sources, including research institutions and museums, and local, state, and federal fisheries agencies.
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California Water Science Center

Central Valley Hydrologic Model version 2 (CVHM2): Observation Data (Groundwater Level, Streamflow) (ver. 3.0, April 2026) Central Valley Hydrologic Model version 2 (CVHM2): Observation Data (Groundwater Level, Streamflow) (ver. 3.0, April 2026)

This digital dataset includes two sets of observational data (groundwater level and streamflow) used to calibrate the updated Central Valley Hydrologic Model (CVHM2). Subsidence and Aquifer-System Compaction Data Used as Observations are available in the companion data release (Brandt and others, 2026; https://doi.org/10.5066/P144BREY). CVHM2 is a tool that can be used to quantify the
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California Water Science Center

Central Valley Hydrologic Model version 2 (CVHM2): Subsidence and Aquifer-System Compaction Data Used as Observations Central Valley Hydrologic Model version 2 (CVHM2): Subsidence and Aquifer-System Compaction Data Used as Observations

The Central Valley, and particularly the San Joaquin Valley, has a long history of land subsidence caused by groundwater development. The extensive withdrawal of groundwater from the unconsolidated deposits of the San Joaquin Valley lowered groundwater levels and caused widespread land subsidence—reaching 9 meters by 1981. More than half of the thickness of the aquifer system is composed...
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California Water Science Center

Central Valley Hydrologic Model version 2 (CVHM2): Subsidence Package Central Valley Hydrologic Model version 2 (CVHM2): Subsidence Package

This digital dataset contains datasets used to develop the Subsidence Package in CVHM2. Data includes number of delay interbeds per model cell (Neq), equivalent thickness for a delay interbeds (Beq), and the zones used to define subsidence parameters. Beq and Neq are calculated from the database of well logs, which is provided in the parent dataset. Five zones are used to define...
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California Water Science Center

Central Valley Hydrologic Model version 2 (CVHM2): Groundwater Pumping Central Valley Hydrologic Model version 2 (CVHM2): Groundwater Pumping

This digital dataset contains datasets used to develop the Multi Node Well (MNW2) Package in CVHM2. It includes well locations, well properties for Municipal Pumping, Rural Pumping, Recovery Pumping, and Agricultural Pumping. The data release also includes pumping rates for Municipal Pumping, Rural Pumping, Recovery Pumping. Agricultural Pumping are estimated in CVHM2 by the farm process...
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California Water Science Center

Historical produced water chemistry data compiled for the Santa Maria Valley Oil Field, Santa Barbara County, California Historical produced water chemistry data compiled for the Santa Maria Valley Oil Field, Santa Barbara County, California

This digital dataset contains historical geochemical and other information for 89 samples of produced water from 84 sites in the Santa Maria Valley Oil Field in Santa Barbara County, California. Produced water is a term used in the oil industry to describe water that is produced from oil wells as a byproduct along with the oil and gas. Additionally, 3 samples from 3 sites that represent...
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California Water Science Center

Generalized use classification for groundwater sites in California with publicly available water-quality data in the U.S. Geological Survey National Water Information System (NWIS) data archive (ver. 1.1, April 2025) Generalized use classification for groundwater sites in California with publicly available water-quality data in the U.S. Geological Survey National Water Information System (NWIS) data archive (ver. 1.1, April 2025)

The U.S. Geological Survey Water Data for the Nation (WDFN; U.S. Geological Survey, 2025) data archive contains publicly available water-quality data for approximately 21,000 groundwater wells and springs in California. This data release publishes site type information and a generalized use classification for each site. The generalized use category is derived from, but is not equivalent...
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California Water Science Center

Bed material grain size distributions for surficial samples from Iron Gate, Copco, and J.C. Boyle Reservoirs Bed material grain size distributions for surficial samples from Iron Gate, Copco, and J.C. Boyle Reservoirs

This product summarizes the collection and analysis of bed material sample grain size distribution collected from the Iron Gate, Copco, and J.C. Boyle Reservoirs located in Northern California and Southern Oregon on the Klamath River. Samples were collected on June 16, 2020 from cores (less than 1m depth) and processed for the full size distribution.
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California Water Science Center
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