Harmful algal bloom and aquatic weeds data from the Sacramento-San Joaquin Delta, collected to evaluate the impact of the 2021 Temporary Urgency Change Order and Emergency Drought Barrier

A data set containing daily average air temperatures and degree days above 19 degrees Celsius for the region near the upper San Francisco Estuary (Delta) from 2015-2021. Values are based on averages of three continuous weather observation stations located near the Delta: San Joaquin River McCune station (SJR), Harvey O' Banks Pumping Plant (HBP), and San Joaquin River at Mossdale (MSD).

A data set containing concentrations of chlorophyll-a and three nutrient parameters (Dissolved Ammonia, Dissolved Nitrate + Nitrite, and Dissolved Ortho-phosphate) in water samples collected at various locations in the San Francisco Estuary (Delta) east of Chipps Island for 2014-2021.

A data set containing daily averages of various continuous water quality parameters measured in the water in-situ at the stations near Franks Tract located in the upper San Francisco Estuary (Delta). Water quality parameters include Dissolved Oxygen, pH, and Chlorophyll Fluorescence. Data was collected by DWR and USGS from 2015-2021.

A data set containing daily average water temperatures and degree days above 19 degrees Celsius for the upper San Francisco Estuary (Delta) from 2015-2021. Values are based on averages of six continuous water quality stations located in the Central and Southern Delta: False River near Oakley (FAL), Middle River near Holt (HLT), Holland Cut near Bethel Island (HOL), Middle River at Middle River (MDM), Old River at Quimbly (ORQ), and Old River at Franks Tract near Terminous (OSJ).

A data set containing counts of pixel values derived from HAB satellite data within 4 Cyano Index categories for four open water regions in the upper San Francisco Estuary (Delta): Franks Tract, Mildred Island, Clifton Court Forebay, and Liberty Island. Summary statistics cover the summer through fall (June-Oct) in 2019-2021. The Cyano Index categories (Low, Moderate, High, and Very High) were based on WHO recreational guidance level thresholds. The data set also includes counts of pixels that were below the detection limit for the imagery processing method and counts of pixels that were either invalid or missing.

A data set containing CyanoHAB incident reports in the upper San Francisco Estuary (Delta) in 2021. Most of this data is from the State Water Board's HAB Incident Report Map. This is combined with the maximum advisory levels for Microcystins that occurred at each station in 2021 from the cyanotoxin concentration data in the Cyanotoxins table. The advisory levels were developed by the California Cyanobacteria and Harmful Algal Bloom Network (CCHAB).

A data set containing Cyanotoxin concentrations in whole-water grab samples collected at various locations in the upper San Francisco Estuary (Delta). The majority of the available cyanotoxin data was collected in 2021, so this data set only includes data from 2021 for all stations except for Big Break Regional Shoreline. Big Break has a longer monitoring history, so all data collected at this location from 2015–2021 are included in this data set.

A data set containing Microcystis visual index, secchi depth, and water temperature data collected at various locations in the upper San Francisco Estuary (Delta) from 2007-2021.

A data set containing phytoplankton community data of potentially toxic Cyanobacteria collected by DWR's Environmental Monitoring Program at various locations in the upper San Francisco Estuary (Delta) from 2014-2021.

Daily flow parameters modeled by DWR's Dayflow program

Fluorescence of various algal taxa measured by USGS and DWR during mapping surveys of the Delta. Data were collected with a Fluoroprobe.

UC Davis CSTARS analysis of hyperspectral imagery giving area covered by aquatic vegetation by region and year.

Fluridone (herbicide) treatments at Franks Tract

Suite of environmental variables hypothesized to affect or be affected by aquatic vegetation. Variables were generally collected in or near focal sites. Values are means of monthly measurements taken during the period each year expected to foster the most vegetation growth, March-October.

Field sampling of submersed aquatic vegetation in Franks Tract and Big Break by the UC-Davis CSTARS lab. Sampling was conducted using a weighted thatch rake head attached to a rope.

Submersed aquatic vegetation monitoring data produced by SePRO and Division of Boating and Waterways. Available data are from surveys conducted annually in October of 2014-2021. Samples collected using a thatch rake head attached to a rope.

Sacramento Valley Hydrologic index and water year classification by water year.

Maps, figures, and tables with additional information.

Report on the impact of the 2021 TUCP and Emergency Drought Barrier on Harmful Algal Blooms and Aquatic Weeds in the Sacramento San Joaquin Delta

This method step describes provenance-based metadata as specified in the LTER EML Best Practices. This provenance metadata does not contain entity specific information.

A link to the original metadata web page on the EDI Portal

A link to the EDI Quality Metadata Page