Keith A Loftin

The Bonnet Carré Spillway (BCS), located about 28 miles northwest of New Orleans, was constructed by the US Army Corp of Engineers in the early 1930s as part of an integrated flood-control system for the lower Mississippi River (MR). The BCS control structure consists of 350 individual bays that can be opened to divert water from the river to Lake Pontchartrain to relieve pressure on downstream levees. Lake Pontchartrain (LP) is hydrologically connected to the Mississippi Sound (MS Sound) and the Gulf of Mexico and is more accurately characterized as an estuarine embayment. BCS openings have occurred twelve times prior to 2019 because of high Mississippi River stages, typically in late spring. In 2019, the spillway...

Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Aquatic Biology, USGS Science Data Catalog (SDC), Water Quality, Water Resources

Concentrations of glyphosate and atrazine compounds in 100 Midwest United States streams in 2013

Temporal patterns in glyphosate and atrazine concentrations were measured weekly by the U.S. Geological Survey (USGS) during the 2013 growing season in 100 small streams in the Midwestern United States. Concentrations also were measured every 2 days at a subset of 8 of the sites, all located in Missouri. Glyphosate was detected more frequently in urban streams than in agricultural streams, and at concentrations similar to those in streams with high agricultural land use in the watershed. In contrast, atrazine was detected more frequently and at higher concentrations in agricultural streams than in urban streams. This data release provides watershed characteristics and 2013 glyphosate and atrazine compound concentrations...

Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Corn Belt, ELISA, Illinois, Indiana, Iowa, All tags... Kansas, Kentucky, Minnesota, Missouri, Nebraska, Ohio, South Dakota, USGS Science Data Catalog (SDC), United States, Water Quality, Wisconsin, atrazine, glyphosate, herbicide, river, spring flush, stream, Fewer tags

Exposure potential of saltmarsh units in Edwin B. Forsythe National Wildlife Refuge to environmental health stressors (polygon shapefile)

Natural and anthropogenic contaminants, pathogens, and viruses are found in soils and sediments throughout the United States. Enhanced dispersion and concentration of these environmental health stressors in coastal regions can result from sea level rise and storm-derived disturbances. The combination of existing environmental health stressors and those mobilized by natural or anthropogenic disasters could adversely impact the health and resilience of coastal communities and ecosystems. This dataset displays the exposure potential to environmental health stressors in the Edwin B. Forsythe National Wildlife Refuge (EBFNWR), which spans over Great Bay, Little Egg Harbor, and Barnegat Bay in New Jersey, USA. Exposure...

Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, Map Service; Tags: Atlantic Ocean, Barnegat Bay, Edwin B. Forsythe National Wildlife Refuge, Great Bay, Little Egg Island, All tags... New Jersey, United States, coastal ecosystems, coastal processes, contaminant transport, contamination, ecological processes, ecotoxicology, environment, environmental assessment, estuary, facility registry service, inlandWaters, marsh health, oceans, polygon shapefile, resilience, salt marsh, sediment, sedimentation, toxic release inventory, vegetation, vulnerability, wetland ecosystems, wetland ecosystems, wetland functions, Fewer tags

Cyanotoxin, chlorophyll-a, and cyanobacterial toxin genetic data for samples collected at eleven large river sites throughout the United States, June through October 2018

This U.S. Geological Survey (USGS) data release provides discretely measured cyanotoxin, chlorophyll-a, and cyanobacterial toxin genetic data for samples collected from eleven large river sites throughout the United States, from June through October 2018. Discrete water-quality samples were analyzed for cyanotoxins (anatoxin, cylindrospermopsin, microcystin, and saxitoxin), chlorophyll-a, and cyanobacterial toxin genetics as part of a National Water-Quality Assessment Project pilot study to describe cyanobacteria and cyanotoxin occurrence in the Nation's large rivers.

Categories: Data; Tags: Anatoxin, Aquatic Biology, California, Chattahoochee River near Whitesburg, GA, Chlorophyll-a, All tags... Connecticut, Connecticut River at Thompsonville, CT, Contaminants, HABS, Cyanotoxin genetics, Cyanotoxins, Cylindrospermopsin, Delaware River at Trenton, NJ, Discretely measured, Dolichospermum (formerly Anabaena), Ecology, Environmental Health, Enzyme-linked immunosorbent assay (ELISA), Genetics, Georgia, Kansas, Kansas River at De Soto, KS, Limnology, Maryland, Microcystin, Microcystis, Minnesota, Mississippi River at Hastings, MN, Missouri, Missouri River at Hermann, MO, New Jersey, Ohio, Ohio River at Cannelton Dam at Cannelton, IN, Oregon, Pheophytin-a, Phytoplankton community composition, Planktothrix, Quantitative polymerase chain reaction (qPCR), Sacramento River at Freeport, CA, Saxitoxin, Susquehanna River at Conowingo, MD, Texas, Trinity River below Dallas, TX, USGS Science Data Catalog (SDC), USGS Station ID 01184000, USGS Station ID 01463500, USGS Station ID 01578310, USGS Station ID 02338000, USGS Station ID 03303280, USGS Station ID 05331580, USGS Station ID 06892350, USGS Station ID 06934500, USGS Station ID 08057410, USGS Station ID 11447650, USGS Station ID 14211720, United States, Water, Water Quality, Water Quality, Water quality, Willamette River at Portland, OR, anaC gene, cyrA gene, mcyE gene, sxtA gene, Fewer tags

Microcystin, chlorophyll, and cell-count data for assessing the effect of salinity tolerance on cyanobacteria associated with a harmful algal bloom in Lake Okeechobee, Florida, July 9 to 17, 2017

This U.S. Geological Survey (USGS) Data Release provides microcystin, chlorophyll, and cell-count data for assessing the effect of salinity tolerance on cyanobacteria associated with a harmful algal bloom in Lake Okeechobee, Florida. All data are reported as raw measured values and are not rounded to USGS significant figures. Water and algal bloom material were collected from Lake Okeechobee, Florida on July 7, 2017. This dataset includes measurements of subsamples taken in the laboratory, collected July 9 to July 17, 2017, at nine different salinity concentrations.

Categories: Data; Tags: Chlorophyll, Cyanobacteria, Dolichospermum, Florida, Harmful Algal Bloom, All tags... Lake Okeechobee, Microcystin, Microcystis, Pheophytin, Salinity, USGS Science Data Catalog (SDC), United States, Fewer tags