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Historical methyl mercury in San Francisco Bay San Francisco Bay, California is considered a mercury-impaired watershed. Elevated concentrations of mercury are found in water and sediment as well as fish and estuarine birds. Sources of mercury to the watershed since 1845 include sediment-associated mercury from mercury mining, mercury losses from gold amalgamation activities in mines of the Sierra Nevada, aerial deposition of mercury from global and regional emissions to air, and the direct discharge of mercury to Bay waters associated with the urbanization and industrialization of the estuary. We assessed historical trends in mercury bioaccumulation by measuring mercury concentrations in feathers of the endangered California Ridgway’s rail (formerly California... Categories: Data; Tags: California Ridgway's Rail, Feathers, Ice Cores, Lake Tahoe, Mercury, All tags... San Francisco Bay, Sediment, Structural Equation Model, USGS Science Data Catalog (SDC), Wyoming, Fewer tags Sediment size distributions from San Pablo Bay and China Camp Marsh, California As part of the hydrodynamic and sediment transport investigations in San Pablo Bay and China Camp Marsh, California, particle size distributions of bed sediments were measured at most instrumented stations and are presented in a comma-delimited values spreadsheet. This portion of the data release presents San Pablo Bay and China Camp Marsh sediment particle size distributions from samples collected during multiple instrument deployments. Users are advised to check the data carefully for sampling time, location, and reference information. Categories: Data; Tags: China Camp, Marin County, Oceans, San Francisco Bay, San Pablo Bay, All tags... Sediment, Sedimentation, Substrate, USGS:59c45772e4b017cf313bea5f, grain-size analysis, ocean processes, particle-size analysis, sediment transport, sediments, Fewer tags Sediment Concentration, Water Velocity, and Suspended Particle Size and Settling Data to Estimate Estuarine Sediment Flux at Dumbarton Bridge, San Francisco Bay, CA from 2018 - 2019 Measurements of suspended sediment concentration, water velocity, suspended-sediment particle size, and suspended-sediment particle settling velocity were collected to estimate suspended-sediment flux and investigate sediment transport processes at Dumbarton Bridge in San Francisco Bay (NWIS station 373015122071000) from calendar year 2018 to 2019. Data were collected using: stationary and boat-mounted acoustic Doppler current meters (ADCP, a 1 MHz Nortek Aquadopp and a 1200kHz Teledyne RiverPro, respectively), four stationary and one profiling multiparameter water quality profiling sondes (YSI 6920), a stationary acoustic backscattering sensor (ABS, Sequoia LISST-ABS), a stationary laser diffraction particle size... Categories: Data; Tags: Don Edwards San Francisco Bay National Wildlife Refuge, Dumbarton Bridge, Dumbarton Point, San Francisco Bay, USGS Science Data Catalog (SDC), All tags... environment, estuarine processes, inlandWaters, oceans, sediment transport, surface water quality, Fewer tags Mercury speciation and other constituent data for surface water and bed sediment associated with the Hamilton Airfield Wetland Restoration, Novato, California. USA (ver. 4.0, March 2023) The Hamilton Wetland Restoration Project (HWRP) is a joint venture between the US Army Corps of Engineers (USACE; San Francisco District) and the California State Coastal Conservancy. The site is located on the property of the former Hamilton Army Airfield in Novato, California, along the western edge of San Pablo Bay, which is part of northern San Francisco Bay. The initial stages of wetland restoration, which included dredged sediment reuse, took place during 2009–2011. From 2011 until April 2014, the site was maintained as partially flooded through a temporary one-way culvert that allowed bay water onto the site. On April 25th, 2014, the outboard levee towards the north-eastern corner of the site was breached... Categories: Data, Data Release - Revised; Tags: Novato, San Francisco Bay, San Pablo Bay, USGS Science Data Catalog (SDC), biochemistry, All tags... boundaries, carbon isotope analysis, iron, mercury, mercury contamination, nutrient content (water), oxygen content (water), sediment geochemistry, sulfur, suspended material (water), wetland ecosystems, wetland restoration, Fewer tags Hillshade raster (235-degree azimuth, 20-degree sun angle) derived from lidar data collected after the August 24, 2014 South Napa earthquake Hillshade of lidar-derived, bare earth digital elevation model, with 235-degree azimuth and 20-degree sun angle, 0.25m resolution, depicting earthquake effects following the August 24, 2014 South Napa Earthquake. Categories: Data; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: California, Napa, Napa County, San Francisco Bay, earthquake occurrences, All tags... faulting (geologic), field inventory and monitoring, field methods, field sampling, geoscientificInformation, image collections, lidar, Fewer tags Benthic Community Dynamics in Coyote Creek and Artesian Slough, Southern San Francisco Bay, California, May 2016 to March 2018 Benthic invertebrate communities are monitored because the composition of those communities can affect and be affected by the water quality of an aquatic system. Benthic communities use and sometimes regulate the cycling of essential elements (for example, carbon). Benthic invertebrate taxa may also indicate acute and chronic stressors in an environment because they accumulate contaminants and can respond – sometimes dramatically - to oligotrophic and eutrophic conditions. Benthic communities affect water quality by grazing pelagic food resources and increasing the rate of nutrient regeneration through feeding and bioturbating sediments. South San Francisco Bay is a system dependent on phytoplankton as the base... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Alviso Slough, Annelids, Aquatic Biology, Benthic Ecosystems, Benthos, All tags... Bivalves, California, Community Ecology, Coyote Creek, Crustaceans, Don Edwards San Francisco Bay National Wildlife Refuge, Ecology, San Francisco Bay, USGS Science Data Catalog (SDC), slough, Fewer tags Erodibility Data from Gust Erosion Chamber Experiments in Grizzly Bay and San Pablo Bay, California, Summer 2019 A Gust erosion chamber was used to apply horizontal shear stress to sediment cores obtained from San Pablo and Grizzly (within Suisun) Bays in California. A pair of sediment cores were collected from the same approximate locations in each bay six times between June 12th, 2019 and August 15th, 2019 for a total of 12 experiments and 24 sediment core results. Locations were chosen to capture the benthic variability along the estuarine salinity gradient, are established benthic monitoring stations, proximity to historic/restored wetlands, and practicality for field operations. Sampling dates targeted spring and neap tide conditions. An onshore experiment was conducted on each core to apply shear stresses with stepwise... Categories: Data; Tags: CAWSC, California Water Science Center, Fine Unconsolidated Substrate, Grizzly Bay, Gust chamber, All tags... San Francisco Bay, San Pablo Bay, State of California, USGS Science Data Catalog (SDC), USGS-CC California Bay Delta, Water Resources, erosion, grab sampling, micro-erosion, oceans, sea-floor characteristics, sediment, sediment erosion, sediment transport, unconsolidated deposits, Fewer tags LEAN-corrected San Francisco Bay Digital Elevation Model, 2018 Lidar-derived digital elevation models often contain a vertical bias due to vegetation. In areas with tidal influence the amount of bias can be ecologically significant, for example, by decreasing the expected inundation frequency. We generated a corrected digital elevation mode (DEM) for tidal marsh areas around San Francisco Bay using the Lidar Elevation Adjustment with NDVI (LEAN) technique (Buffington et al. 2016). Survey-grade GPS survey data (6614 points), NAIP-derived Normalized Difference Vegetation Index, and original 1 m lidar DEM from 2010 were used to generate a model of predicted bias across tidal marsh areas. The predicted bias was then subtracted from the original lidar DEM and merged with the NOAA... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, GeoTIFF, Map Service, Raster; Tags: Remote Sensing, San Francisco Bay, USGS Science Data Catalog (SDC), biota, digital elevation models, All tags... estuary, lidar, wetlands, Fewer tags Discrete sample surface-water data for the Sacramento-San Joaquin River Delta The goal of this study was to develop a suite of inter-related water quality monitoring approaches capable of modeling and estimating the spatial and temporal gradients of particulate and dissolved total mercury (THg) concentration, and particulate and dissolved methyl mercury (MeHg), concentration, in surface waters across the Sacramento / San Joaquin River Delta (SSJRD). This suite of monitoring approaches included: a) data collection at fixed continuous monitoring stations (CMS) outfitted with in-situ sensors, b) spatial mapping using boat-mounted flow-through sensors, and c) satellite-based remote sensing. The focus of this specific Child Page is to present all field and laboratory-based data associated with... Categories: Data; Tags: Lower Sacramento, San Francisco Bay, San Joaquin Delta, chemical analysis, datasets, All tags... dissolved metals, environment, field monitoring stations, field sampling, laboratory methods, mercury, mercury analysis, nutrient content (water), oxygen content (water), real-time monitoring and reporting, surface water quality, suspended material (water), water chemistry, water column reflectivity, water pH, water properties, water quality, water sampling, water sampling, water temperature, Fewer tags Flow through system (FTS) and spectral absorption / attenuation sensor (ACS) data from boat mapping transects within the Sacramento-San Joaquin River Delta The goal of this study was to develop a suite of inter-related water quality monitoring approaches capable of modeling and estimating the spatial and temporal gradients of particulate and dissolved total mercury (THg) concentration and particulate and dissolved methyl mercury (MeHg) concentration in surface waters across the Sacramento / San Joaquin River Delta (SSJRD). This suite of monitoring approaches included: a) data collection at fixed continuous monitoring stations (CMS) outfitted with in-situ sensors, b) spatial mapping using boat-mounted, flow-through, sensors and c) satellite-based remote sensing. The focus of this specific Child Page is to present all data collected during the underway boat mapping component... Categories: Data; Tags: California, Lower Sacramento, Sacramento, San Francisco Bay, San Joaquin Delta, All tags... Solano, Yolo, chemical analysis, dissolved organic compounds, environment, environmental proxies, field inventory and monitoring, field sampling, nutrient content (water), optical methods, oxygen content (water), real-time monitoring and reporting, salinity, surface water quality, suspended material (water), transect sampling, water chemistry, water column reflectivity, water pH, water properties, water sampling, water sampling, water temperature, Fewer tags High resolution and discrete temporal and spatial water-quality measurements in support of modeling mercury and methylmercury concentrations in surface waters of the Sacramento-San Joaquin River Delta The Sacramento / San Joaquin River Delta (SSJRD) is contaminated with legacy mercury (Hg) from historical mining and mineral processing activities throughout the watershed, as well as from contemporary atmospheric and industrial inputs. The current project was designed for the purpose of developing high-resolution spatial and temporal models for estimating concentrations of mercury species in surface waters of the SSJRD. The field component of the project brings together three high-resolution platforms for collecting water-quality data (fixed continuous monitoring stations (CMS) outfitted with in-situ sensors, spatial mapping using boat-mounted flow-through sensors, and satellite-based remote sensing) coupled with... Categories: Data; Tags: California, Environmental Health, Geochemistry, Lower Sacramento, Remote Sensing, All tags... Sacramento, San Francisco Bay, San Joaquin Delta, Solano, USGS Science Data Catalog (SDC), Water Quality, Yolo, chemical analysis, environment, environmental proxies, field inventory and monitoring, field monitoring stations, field sampling, mercury, mercury analysis, mercury contamination, optical methods, remote sensing, suspended material (water), transect sampling, water chemistry, water column reflectivity, water properties, water sampling, water sampling, Fewer tags Data for monitoring trace metals in sediment and clam tissue near the Palo Alto Regional Water Quality Control Plant in South San Francisco Bay, California (ver 2.0, November 2022) Sediment particles can strongly bind metals, effectively repartitioning them from solution to a solid phase. As a result, sediments may accumulate and retain metals released to an aquatic environment. Sediment cores provide a historical record of metal inputs that can reveal anthropogenic influences (Förstner and Wittmann, 1979). Specifically, studies of sediment cores in San Francisco Bay chronicled metal inputs and suggested that legacy contamination can remain a chronic source of metals to the system owing to sediment mixing and redistribution (Hornberger and others, 1999; Van Geen and Luoma, 1999). Metals in sediments also indicate exposure levels to benthic animals through contact with, and ingestion of, bottom... Categories: Data; Tags: Benthic environments, Benthos, Benthos, Biological sampling, Bivalves, All tags... Burrowing organisms, Metals, San Francisco Bay, Sediments, aluminum, benthic ecosystems, biota, chromium, copper, geochemistry, iron, mercury, metal elements, nickel, sediment geochemistry, selenium, silver, zinc, Fewer tags Mercury speciation and other constituent data for surface water and bed sediment associated with the Hamilton Airfield Wetland Restoration, Novato, California. USA (ver. 2.0, June 2021) Note: This data release has been superseded by version 3.0, available here: https://doi.org/10.5066/P9Q2YP9K. The Hamilton Wetland Restoration Project (HWRP) is a joint venture between the US Army Corps of Engineers (USACE; San Francisco District) and the California State Coastal Conservancy. The site is located on the property of the former Hamilton Army Airfield in Novato, California, along the western edge of San Pablo Bay, which is part of northern San Francisco Bay. The initial stages of wetland restoration, which included dredged sediment reuse, took place during 2009–2011. From 2011 until April 2014, the site was maintained as partially flooded through a temporary one-way culvert that allowed bay water onto... Categories: Data, Data Release - Revised; Tags: Geochemistry, Novato, San Francisco Bay, San Pablo Bay, USGS Science Data Catalog (SDC), All tags... Water Quality, biochemistry, boundaries, carbon isotope analysis, iron, mercury, mercury contamination, nutrient content (water), oxygen content (water), sediment geochemistry, sulfur, suspended material (water), wetland ecosystems, wetland restoration, Fewer tags Breeding Waterbird Populations in South San Francisco Bay 2005-2019 The dataset includes three separate excel spreadsheets which provides waterbird (and predator) observations within individual survey units during the May 2019 breeding waterbird survey of south San Francisco Bay (2019WaterbirdSurveyFullData.xlsx), the total number of American avocets, black-necked stilts, and Forster's terns within each pond unit surveyed during the May 2019 survey (2019WaterbirdSurveyPondModel.xlsx), and the annual total number of nests for American avocets, black-necked stilts, and Forster's terns in south San Francisco between 2005 and 2019 (SouthBayWaterbirdNests2005-2019.xlsx). These data support the following publication: Hartman, C.A., Ackerman, J.T., Schacter, C.R., Herzog, M.P., Tarjan,... Categories: Data; Tags: San Francisco Bay, USGS Science Data Catalog (SDC), Wildlife Biology, biota, birds, All tags... estuarine ecosystems, land use change, long-term ecological monitoring, migratory species, population dynamics, wetland ecosystems, Fewer tags Orthomosaic images of the Whale's Tail Marsh region, South San Francisco Bay, CA This portion of the data release presents orthomosaic images of the Whale's Tail Marsh region of South San Francisco Bay, CA. The orthomosaics have resolutions of 2.5 centimeters per pixel and were derived from structure-from-motion (SfM) processing of repeat aerial imagery collected from fixed-wing aircraft. The raw imagery used to create these elevation models was acquired from an approximate altitude of 427 meters (1,400 feet) above ground level (AGL), using a Hasselblad A6D-100c camera fitted with an HC 80 lens, resulting in a nominal ground-sample-distance (GSD) of 2.5 centimeters per pixel. The acquisition flight lines were designed to provide approximately 50 percent overlap between adjacent flight lines... Categories: Data; Tags: Alameda County, Alameda Creek, Bathymetry and Elevation, CHMRP, Coastal and Marine Hazards and Resources Program, All tags... Mount Eden Creek, PCMSC, Pacific Coastal and Marine Science Center, San Francisco Bay, SfM, State of California, Structure-from-motion, U.S. Geological Survey, USGS, aerial and satellite photography, aerial photography, altimetry, geomorphology, geoscientificInformation, geospatial datasets, image mosaics, orthophotography, photography, remote sensing, remote sensing, structure from motion, Fewer tags Radiocarbon measurements, census counts of benthic foraminifera, diatoms, and palynomorphs, and geochemistry from core 721-1 obtained in 2002 off San Francisquito Creek in South San Francisco Bay The urbanized area of downtown Menlo Park is subject to persistent flooding and sediment deposition by San Francisquito Creek in South San Francisco Bay. To mitigate these events, a suite of cores was collected in 2002 at the mouth of the creek to determine sediment depositional rates on the delta. One of those cores (721-1) was selected for microbiological (pollen, diatoms, and foraminifera) and geochemical analyses to reconstruct a depositional record over the past two millennia. This data release provides radiocarbon dates, census counts of benthic foraminifera, diatoms, and palynomorphs, and the measurement of anthropogenic metals and other elements in sediments from this core. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: CMHRP, Coastal and Marine Hazards and Resources Program, Habitat, Hooks Point, Invertebrates, All tags... PCMSC, Pacific Coastal and Marine Science Center, San Francisco Bay, San Francisquito Creek, Substrate, U.S. Geological Survey (USGS), USGS, animals, bay, benthic foraminifera, biota, carbon-14 analysis, chemical analysis, diatoms, environment, foraminifera, geochemistry, geoscientificInformation, gravity coring, marine chemistry, mass spectroscopy, mercury analysis, none, organisms, palynology, protists, radiometric dating, sediment deposition, sediment geochemistry, sediment-pollutant interaction, society, Fewer tags Suspended sediment concentrations from water samples collected in San Pablo Bay and Grizzly Bay, California, 2020 Water samples were collected in San Pablo Bay and Grizzly Bay on five days from January through June 2020. The water samples were collected from a small vessel near pre-established USGS instrument moorings using a peristaltic pump or a Niskin bottle. Data are provided in a comma-delimited values spreadsheet. Categories: Data; Tags: CMHRP, Coastal and Marine Hazards and Resources Program, Grizzly Bay, PCMSC, Pacific Coastal and Marine Science Center, All tags... San Francisco Bay, San Pablo Bay, State of California, U.S. Geological Survey, USGS, Water-Quality Parameters, field sampling, marine water quality, oceans, suspended material (water), water sampling, water sampling, Fewer tags Bathymetric change of South San Francisco Bay, California: 1979 to 2020 This 50-m-resolution surface presents bathymetric change of South San Francisco Bay, California (hereafter referred to as South Bay). This surface compares a 1-m-resolution digital elevation model (DEM) of the southern portion of San Francisco Bay (Fregoso and others, 2021), comprised of bathymetry data in the South Bay region from the time period referred to as the 2010s because the majority of the surveys were in that decade, to a 50-m-resolution DEM of South Bay comprised of historic surveys from 1979 to 1985 (referred to as the 1980s because the majority of the surveys were in that decade). The creation of this change surface involved the resampling of the 1-m-resolution 2010s DEM to match the 50-m-resolution... Categories: Data; Tags: Bathymetry and Elevation, GPS measurement, Global Positioning System (GPS) observations, San Francisco Bay, South Bay, All tags... bathymetry, coastal processes, digital elevation models, elevation, geographic information systems, geographic information systems (GIS), geospatial datasets, inlandWaters, multibeam echo sounder, multibeam sonar, single-beam echo sounder, single-beam echo sounder, topographic mapping, topography, Fewer tags Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the San Francisco Bay, California: 2021-2022 High-resolution mapping surveys The dataset documents the spatial and temporal variability of nutrients and related water quality parameters at high spatial resolution in the San Francisco Bay of California, USA in 2021 and 2022. The dataset includes nitrate, temperature, conductivity, dissolved oxygen, and chlorophyll as well as information about phytoplankton community composition. Data-collection cruises were conducted under different environmental/flow conditions. Version history: On 3/15/24, the provisional data files hosted on this webpage were removed, and replaced with updated finalized files. Categories: Data; Tags: California, San Francisco Bay, San Pablo Bay, Suisun Bay, USGS Science Data Catalog (SDC), All tags... United States, bay, biogeochemistry, biota, drinking water use, environment, high frequency, high-resolution, hydrogeology, inlandWaters, nutrient content (water), nutrients, phytoplankton, public supply water use, real-time, statistical analysis, visualization methods, water quality, water quality, Fewer tags Selenium concentrations in tissues of the cyprinid Sacramento Splittail of the San Francisco Estuary (2010-11 and 2017) Estuaries provide critical habitat for a vast array of fish and wildlife but are also a nexus for core economic activities that mobilize and concentrate contaminants that can threaten aquatic species. Selenium (Se), an essential element and potent reproductive toxin, is enriched in parts of the San Francisco Estuary (SFE) to levels known to cause toxicity, yet the risk of Se to species that inhabit the SFE is not well understood. We quantified Se concentrations in muscle, liver, and ovary of the demersal cyprinid Sacramento Splittail from six regions in the SFE at three time points (fall 2010-11, spring 2017) to evaluate Se exposure risk. Here we report fish morphological attributes, total selenium concentrations... Categories: Data; Tags: Aquatic Biology, Ecology, Geochemistry, Geography, Geomorphology, All tags... Hydrology, Sacramento-San Joaquin Delta, San Francisco Bay, USGS Science Data Catalog (SDC), Water Resources, Wildlife Biology, bioaccumulation, biological monitoring, cyprinid, delta, estuary, exposure risk, selenium, Fewer tags 1 2 3 4 »