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Microplastics in Lake Mead National Recreation Area, 2017-2018: U.S. Geological Survey data release This dataset describes the quantity and morphology of microplastics in water, surficial sediment, sediment core, fish, and shellfish samples from Lake Mead National Recreation Area (Nevada/Arizona). Water and surficial sediment samples were collected once at 9 locations. A sediment core (33 cm long) was extracted from Las Vegas Bay to assess changes in microplastic deposition over time. Striped bass (Morone saxatilis), common carp (Cyprinus carpio), quagga mussels (Dreissena bugensis), and Asian clams (Corbicula fluminea) were sampled at a subset of locations to assess biological uptake of microplastics. Sampling and analysis methods are described in the Processing Steps section of the metadata. All samples were... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Environmental Health, Lake Mead, Lower Colorado, USGS Science Data Catalog (SDC), Water Quality, All tags... Water Resources, biota, contamination and pollution, inlandWaters, microplastics, surface water quality, Fewer tags TDS concentration and load time series for Lower Colorado River Basin tributaries of the Colorado River from WRTDS modeling, 1938 to 2021 Total dissolved solids (TDS) in surface waters affect water quality and useability and are of particular concern in the Colorado River Basin. Estimates of current and past TDS concentration and flux in rivers support appropriate management and salinity control measures. In this study we estimated the total dissolved solid concentration and flux at 11 sites on tributaries of the Colorado River, starting as early as 1938 until 2021. Of these sites, eight were not affected by dams. For these we estimated daily and water year flow normalized TDS concentration and flux using the Weighted Regressions on Time Discharge and Season (WRTDS) water quality modeling framework. For the three sites situated below dams, we used... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Colorado River, Colorado River, Gila River, Lower Colorado, Mogollon Creek, All tags... Salt River, San Pedro River, Total Dissolved Solids (TDS), USGS Science Data Catalog (SDC), Verde River, Virgin River, WRTDS, Water Quality, modeling, salinity, time series, water quality, Fewer tags