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Chesapeake Bay Nontidal Network 1985 – 2018: Daily High-Flow and Low-Flow Concentration and Load Estimates (ver. 1.1, November 2021) Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay Nontidal Network (NTN) stations for the period 1985 through 2018 Nutrient and suspended-sediment loads and changes in loads were determined by applying a weighted regression approach called WRTDS (Weighted Regression on Time, Discharge, and Season). A recently published extension of WRTDS allows users to separate these estimates into high- and low-flow conditions. This data release contains (1) a table of daily high- and low-flow concentration and load estimates for NTN stations between 1985 - 2018 and (2) an R file that contains... Categories: Data, Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Chesapeake Bay Watershed, Delaware, Maryland, New York, Pennsylvania, All tags... USGS Science Data Catalog (SDC), United States, Virginia, WRTDS, Washington DC, West Virginia, flow separation, load analysis, nitrogen, nutrients, phosphorus, rivers, suspended sediment, trends, water quality, weighted regression, Fewer tags 2008 - Present Ecosystem History of South Florida's Estuaries Database (ver. 2.0, June 2022) The 2008 - Present Ecosystem History of South Florida's Estuaries Database contains listings of all sites (modern and core) and modern monitoring site survey information (water chemistry, floral and faunal data, etc.). Three general types of data are contained within this database: 1) Modern Field Data (2008-present), 2) Master list of location information on all modern sites, and 3) Core data - location information. Data are available for modern sites (from 2008 to present) and cores in the general areas of Florida Bay, Biscayne Bay, and the southwest (Florida) coastal mangrove estuaries. Specific sites in the Florida Bay area include Taylor Creek, Bob Allen Key, Russell Bank, Pass Key, Whipray Basin, Rankin Bight,... Categories: Data Release - Revised; Tags: 002, 004, 007, 008, 012, All tags... 014, Alinas Reef, Alligator Bay, Arsenicker Bank, Arsenicker Key, Arsenicker Shoal, Barnes Key, Big Cypress National Preserve, Big Lostmans Bay, Biscayne Bay, Black Creek Canal, Black Point, Black Point Creek Canal, Bob Allen Key, Bottle Key, Broad River, Broad River Bay, Broward County, Buchanan Bank, Butternut Key, Buttonwood Keys, C-111 Canal, Caesars Cut, Cape Sable, Card Bank, Central Everglades, Chicken Key, Chokoloskee Bay, Clive Key, Collier County, Convoy Point, Crab Keys, Crocodile Point, Dead Terrapin Basin, Dragover Bank, Duck Key, Everglades National Park, FL, Featherbed Bank, Florida, Florida Bay, Florida City Canal, Florida Keys, Gopher Pass, Goulds Canal, Gun Rock Point, Harney River, Huston River, Ironwood Channel, Jim Foot Key, Johnson Key, Lake Key, Lignumvitae Basin, Little Blackwater Sound, Little Madeira Bay, Long Sound, Lostmans River, Manatee Bay, McCormick Creek, Miami-Dade County, Middle Key Basin, Military Canal, Monroe County, Monroe Lake, Mowry Canal, Nest Key, North Canal, North Prong Otter Creek, North River, Old Dan Bank, Old Sweat Bank, Otter Creek, Oyster Bay, Park Key, Pass Key, Pavillion Key, Pelican Bank, Peterson Keys, Ponce de Leon Bay, Porjoe Key, Princeton Canal, Prong Creek, Rabbit Key, Rabbit Key Basin, Rankin Basin, Rankin Lake, Roberts River, Rodgers River Bay, Russell Key, SW Big Cypress, Samphire Keys, Schooner Bank, Shark River, Shell Creek, Sid Key, South East Coast, Sprigger Bank, Spy Key, Storter Bay, Tarpon Bay, Taylor Creek, Trout Creek, US, USGS Science Data Catalog (SDC), United States, Whipray Basin, White Water Bay, biology, biota, climatologyMeteorologyAtmosphere, conservation paleobiology, diatoms, ecology, ecology, ecosystem history, environment, estuary, foraminifera, gastropods, geography, geologic core, geology, geoscientificInformation, inlandWaters, molluscs, mollusks, oceans, ostracodes, paleoecology, paleontology, pelecypods, pollen, salinity, sedimentology, vegetation, Fewer tags Digital elevations and extents of regional hydrogeologic units in the Northern Atlantic Coastal Plain aquifer system A digital model of the sedimentary Northern Atlantic Coastal Plain aquifer system is composed of 20 rasters and hydrogeologic unit extent polygons. Rasters describe the top elevations of regional aquifers and confining units at a resolution of 2640 feet (1/2 mile). The rasters are clipped to the extent polygons, which represent the spatial extents of the hydrogeologic units onshore and several miles offshore. This three-dimensional hydrogeologic model was constructed as part of a U.S. Geological Survey Groundwater Resources Program study of groundwater availability in the Northern Atlantic Coastal Plain (NACP) aquifer system, including parts of New York, New Jersey, Delaware, Maryland, Virginia, and North Carolina.... Categories: Data, Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Aquia aquifer, Delaware, Delmarva Peninsula, Eastern Shore, Fall Line, All tags... Fall Zone, Groundwater and Streamflow Information Program, Hydrogeology, Lower Chesapeake aquifer, Magothy aquifer, Maryland, Matawan aquifer, Monmouth-Mount Laurel aquifer, New Jersey, New York, North Carolina, Northern Atlantic Coastal Plain, Northern Atlantic Coastal Plain aquifer system, Piney Point aquifer, Potomac-Patapsco aquifer, Potomac-Patuxent aquifer, USGS Science Data Catalog (SDC), Upper Chesapeake aquifer, Virginia, confined, elevations, heterogeneous, hydrogeologic framework, hydrogeologic units, inlandWaters, surficial aquifer, unconfined, unconsolidated, Fewer tags Baseline groundwater-quality data from a densely developed coastal neighborhood, Falmouth, Massachusetts (2016 - 2021) (ver. 4.0, February 2022) This data release provides a comprehensive dataset of sampling-site characteristics and baseline groundwater-quality data collected from a network of multilevel sampling wells installed in a densely developed coastal neighborhood undergoing a conversion from onsite septic systems to municipal sewering. Groundwater samples were collected during multiple events from a total of 227 well screens at 15 locations using a peristaltic pump between June 2016 and September 2021. Samples were collected and preserved following methods documented in the U.S. Geological Survey National Field Manual (variously dated) and Savoie and others (2012). This dataset provides well construction information, groundwater levels, water-quality... Categories: Data, Data Release - Revised; Tags: Falmouth, Mara Vista, Massachusetts, USGS Science Data Catalog (SDC), groundwater, All tags... groundwater quality, nutrient content, water-quality data, Fewer tags Comprehensive Global Database of Earthquake-Induced Landslide Events and Their Impacts (ver. 2.0, February 2022) Currently, there are many datasets describing landslides caused by individual earthquakes, and global inventories of earthquake-induced landslides (EQIL). However, until recently, there were no datasets that provide a comprehensive description of the impacts of earthquake-induced landslide events. In this data release, we present an up-to-date, comprehensive global database containing all literature-documented earthquake-induced landslide events for the 249-year period from 1772 through August 2021. The database represents an update of the catalog developed by Seal et al. (2020), which summarized events through March 2020 and was based on the catalog developed by Nowicki Jessee et al. (2020). The revised catalog... Categories: Data, Data Release - Revised; Tags: Database, Disaster Impact, Earthquake, Earthquake Hazards, Earthquake-induced landslide, All tags... Fatality, GHSC, Landslide, Landslide Hazards, Natural Disaster, USGS, USGS Science Data Catalog (SDC), geoscientificInformation, Fewer tags Microsatellite data, boundaries of subpopulation centers, and estimated effective migration for greater sage-grouse collected in western North America between 1992 and 2015 (ver. 2.0, December 2022) Characterizing genetic structure across a species’ range is relevant for management and conservation as it can be used to define population boundaries and quantify connectivity. Here, we characterized population structure and estimated effective migration in Greater Sage-grouse (Centrocercus urophasianus). Our objectives were to (1) describe large-scale patterns of population genetic structure and gene flow and (2) to characterize genetic subpopulation centers across the range of Greater Sage-grouse. Samples from 2,134 individuals were genotyped at 15 microsatellite loci. Using standard STRUCTURE and spatial principal components analyses, we found evidence for four or six areas of large-scale genetic differentiation... Categories: Data, Data Release - Revised; Tags: Genetics, Subpopulation Center, USGS Science Data Catalog (SDC), Western North America, biota 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 SPARROW model inputs and simulated streamflow, nutrient and suspended-sediment loads in streams of the Southwestern United States, 2012 Base Year (ver. 2.0, October 2020) The U.S. Geological Survey's (USGS) SPAtially Referenced Regression On Watershed attributes (SPARROW) model was used to aid in the interpretation of monitoring data and simulate streamflow and water-quality conditions in streams across the Southwestern Region of the Unites States. SPARROW is a hybrid empirical/process-based mass balance model that can be used to estimate the major sources and environmental factors that affect the long-term supply, transport, and fate of contaminants in streams. The spatially explicit model structure is defined by a river reach network coupled with contributing catchments. The model is calibrated by statistically relating watershed sources and transport-related properties to monitoring-based... Categories: Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Arizona, California, Colorado, Hydrology, Idaho, All tags... Louisiana, Nevada, New Mexico, Nutrient Loads, Oregon, SPAtially Referenced Regression on Watershed attributes (SPARROW), Spatial analysis, Statistical analysis, Streamflow, Surface-water quality, Suspended-sediment loads, Texas, USGS Science Data Catalog (SDC), Utah, Water Quality, Water Resources, Wyoming, Fewer tags The State Geologic Map Compilation (SGMC) Geodatabase of the Conterminous United States The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States (https://doi.org/10.5066/F7WH2N65) represents a seamless, spatial database of 48 State geologic maps that range from 1:50,000 to 1:1,000,000 scale. A national digital geologic map database is essential in interpreting other datasets that support numerous types of national-scale studies and assessments, such as those that provide geochemistry, remote sensing, or geophysical data. The SGMC is a compilation of the individual U.S. Geological Survey releases of the Preliminary Integrated Geologic Map Databases for the United States. The SGMC geodatabase also contains updated data for seven States and seven entirely new State geologic... Categories: Data, Data Release - Revised; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alabama, Arizona, Arkansas, California, Colorado, All tags... Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, USGS Science Data Catalog (SDC), Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, age, bedrock geologic units, data services, dike, fault, fold, geographic information systems, geologic contacts, geologic map, geologic maps, geologic time periods, geology, geoscientificInformation, geospatial datasets, igneous rocks, metamorphic rocks, sedimentary rocks, structural geology, surficial geologic units, unconsolidated deposits, Fewer tags Geochemical Database for Iron Oxide-Copper-Cobalt-Gold-Rare Earth Element Deposits of Southeast Missouri The Geochemical Database for Iron Oxide-Copper-Cobalt-Gold-Rare Earth Element Deposits of Southeast Missouri (IOCG-REE_GX) contains new geochemical data compilations for samples from IOCG-REE type deposits in which each rock sample has one "best value" determination for each analyzed species, greatly improving speed and efficiency of use. IOCG-REE_GX was created and designed to compile whole-rock and trace element data from southeast Missouri in order to facilitate petrologic studies, mineral resource assessments, and the definition and statistics of geochemical baseline values. This relational database serves as a data archive in support of present and future geologic and geochemical studies of IOCG-REE type deposits,... Categories: Data, Data Release - Revised; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Boss-Bixby deposit, Bourbon deposit, Camel's Hump deposit, Carter County, Cedar Hill deposit, All tags... Crawford County, Dent County, Einstein/Silvermines deposit, FeOx-Cu-Au deposits, FeOx-Cu-Co-Au-REE deposits, Franklin County, IOA+/-REE deposits, IOCG deposits, IOCG-REE deposits, Iron County, Iron Mountain deposit, Iron Oxide-Copper-Cobalt-Gold-Rare Earth Elements deposits, Iron Oxide-apatite+/-Rare Earth Element deposits, Ketcherside Gap deposit, Kratz Spring deposit, Late Precambrian, Lower Pilot Knob deposit, Madison County, Mesoproterozoic, Missouri, NGDB, National Geochemical Database, Pea Ridge deposit, Reynolds County, Shepherd Mountain deposit, St. Francois County, St. Francois Mountains, St. Francois Mountains terrane, Ste. Genevieve County, Twin Rocks County, USA, USGS Science Data Catalog (SDC), United States of America, Washington County, environmental geochemistry, exploration geochemistry, geochemical data, rock chemistry, southeast Missouri, Fewer tags Rare Earth Element Occurrences in the United States Version 4.0 of this data release provides descriptions of more than 200 mineral districts, mines, and mineral occurrences (deposits, prospects, and showings) within the United States that are reported to contain substantial enrichments of the rare earth elements (REEs). These mineral occurrences include mined deposits, exploration prospects, and other occurrences with notable concentrations of the REEs. The inclusion of a particular mineral occurrence in this database is not meant to imply that it has economic potential. Rather, these occurrences were included to capture the distribution and characteristics of the known, reported REEs deposits in the United States, which are diverse in their geology and resource... Categories: Data, Data Release - Revised; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alaska, Arizona, Arkansas, BLM, Bureau of Land Management, All tags... California, Colorado, Earth MRI, Earth Mapping Resources Initiative, Florida, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Georgia, Idaho, Illinois, MRP, Mineral Resources Program, Mineralogy, Missouri, Montana, Nebraska, Nevada, New Jersey, New Mexico, New York, North Carolina, South Carolina, Tennessee, Texas, U.S. Geological Survey, USGS, USGS Mineral Deposit Database, USGS Science Data Catalog (SDC), USMIN, United States, Virginia, Wyoming, cerium, critical mineral, dysprosium, economic geology, economy, erbium, europium, gadolinium, geographic information systems, geoscientificInformation, geospatial datasets, holmium, lanthanum, location, lutetium, mine, mine sites, mineral commodity, mineral deposit areas, mineral deposit type, mineral deposits, mineral occurrence, mineral resources, natural resource exploration, neodymium, open pit mine, praseodymium, rare earth elements, samarium, surface workings, terbium, thulium, underground workings, ytterbium, yttrium, Fewer tags LEAN-Corrected DEM for Suisun Marsh 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 Suisun marsh using a modification of the Lidar Elevation Adjustment with NDVI (LEAN) technique (Buffington et al. 2016). GPS survey data (6912 points, collected across public and private land in 2018), Normalized Difference Vegetation Index (NDVI) derived from an airborne multispectral image (June 2018), a 1 m lidar DEM from September 2018, and a 1 m canopy surface model were used to generate models of predicted bias across the... Categories: Data, Data Release - Revised; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Remote Sensing, San Francisco Bay Estuary, Suisun marsh, USGS Science Data Catalog (SDC), digital elevation models, All tags... elevation, estuary, lidar, wetlands, Fewer tags Cladophora biomass and supporting data collected in the Great Lakes, 2018 (ver. 1.1, September 2020) Note: An error was discovered in the BenthicBiomas Table, mostly in designation of BDLs and zeros. Data are undergoing further QC and the corrected dataset will be posted soon. This dataset records Cladophora and associated submerged aquatic vegetation (SAV) biomass collected approximately monthly during the growing season of 2018 at stations located along the U.S. shoreline of Lakes Michigan, Huron, Erie, and Ontario. It also records a variety of supporting data collected at Cladophora measurement stations. These supporting data include: - seasonal time series of light, currents, wave action, temperature, specific conductivity, turbidity, pH, phycocyanin, chlorophyll, and dissolved oxygen from moored sensors... Categories: Data, Data Release - Revised; Tags: Aquatic Biology, CTD measurement, Ecology, Great Lakes Region, Lake Erie, All tags... Lake Huron, Lake Michigan, Lake Ontario, Limnology, USGS Science Data Catalog (SDC), Water Quality, acoustic Doppler current profiling, algae, algal blooms, aquatic biology, aquatic vegetation, benthos, biota, environment, eutrophication, freshwater ecosystems, habitat alteration, inlandWaters, invasive species, mollusks, nuisance species, nutrient content (water), optical methods, oxygen content (water), phosphorus, submerged aquatic vegetation, surface water quality, suspended material (water), turbidity, water pH, water sampling, water temperature, Fewer tags Daily streamflow datasets used to analyze trends in streamflow at sites also analyzed for trends in water quality and ecological condition in the Nation's rivers and streams In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project of the National Water-Quality Program. One of the major goals of the NAWQA project is to determine how water-quality conditions change over time. To support that goal, long-term consistent and comparable monitoring has been conducted on streams and rivers throughout the Nation. Outside of the NAWQA project, the USGS and other Federal, State, and local agencies also have collected long-term water-quality data to support their own assessments of changing water-quality conditions. Data from these multiple sources have been combined to support... Categories: Data Release - Revised; Types: Citation; Tags: National Water Quality Program, Puerto Rico, USGS Science Data Catalog (SDC), United States, Water Quality, All tags... daily streamflow, ecological streamflows, loads, pesticides, usgsnawqaswtrends, water quality, Fewer tags Fishes of Ryer Island, Suisun Bay, California, 2016-2017 This data set includes field data for fishes sampled using gill nets and otter trawls during daylight hours in and around Ryer Island, Suisun Bay, California. This data release includes all measured environmental parameters and fish taxa included in the analysis. First posted: April 17, 2019 Revised: August 27, 2019 Categories: Data, Data Release - Revised; Tags: Aquatic Biology, Aquatic Biology, California, Ecology, Fish Ecology, All tags... Low Salinity Zone, Ryer Island, Sacramento-San Joaquin Delta, San Francisco Bay Delta, San Francisco Estuary, Suisun Bay, Tidal Wetland, USGS Science Data Catalog (SDC), United States, Water Resources, Wildlife Biology, biota, environment, Fewer tags Water quality and ancillary data for assessment of uranium concentrations in groundwater, San Joaquin Valley, CA (ver. 1.1, December, 2019) High concentrations of uranium were detected in samples from wells used for domestic drinking water supplies in the San Joaquin Valley. Of 163 domestic wells sampled by the California Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP) and the National Water Quality Program (NWQP) in 2008-2015, 26 percent had uranium concentrations greater than the U.S. Environmental Protection Agency maximum contaminant level (EPA MCL) of 30 µg/L, with 13 percent of the wells having uranium concentration between 100 µg/L and 450 µg/L. To evaluate the potential anthropogenic and geologic causes of these anomalously high uranium concentrations, Rosen and others (2019) compiled water quality and... Categories: Data, Data Release - Revised; Tags: Fresno County, GAMA Priority Basin Project, Groundwater Ambient Monitoring and Assessment Program (GAMA), Kings County, Madera County, All tags... National Water Quality Assessment Program (NAWQA), San Joaquin Valley, Tulare County, USGS Science Data Catalog (SDC), domestic well water use, drinking water, geoscientificInformation, groundwater geochemistry, uranium, 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 Historical Ice Breakup Dates for Chequamegon Bay, Lake Superior, 1911 to 2021 (ver. 4.0, June 2021) Note: this data release has been superseded by version 5.0, available here: https://doi.org/10.5066/F7HT2NNP Ice breakup dates of Chequamegon Bay, Lake Superior from 1911 to 2021 were compiled by Lori Evrard (USGS, GLSC, Lake Superior Biological Station, Ashland, WI). Ice breakup date is the day in spring when winter ice cover substantially leaves a water body. Local residents deem "ice breakup" as when the ice moves northeast of a line straight across Chequamegon Bay out from Ellis Avenue (State highway 13). Another way ice breakup was determined has been if you could drive a boat from the outlet of Fish Creek to Houghton Point. The ice may move back and forth over that line but the ice is breaking up, moving... Categories: Data, Data Release - Revised; Tags: Ashland, Chequamegon Bay, Climatology, Great Lakes, Lake Superior, All tags... Wisconsin, bays, climatologyMeteorologyAtmosphere, lake ice, snow and ice cover, time series datasets, Fewer tags Non-linear baseflow separation model with parameters and results (ver. 2.0, October 2022) This data release provides source code and an R workspace with functions comprising a non-linear baseflow separation model, calibrated values of parameters and estimates of the baseflow component of daily streamflow at selected streamflow gages. Parameter values were determined by calibration of the model. Estimates of the baseflow component include daily values and the total baseflow as a fraction of streamflow for the analysis period. The file 'run_bf_sep.zip' in the directory 'Nonlinear Baseflow Model Source Code, Functions, and Scripts" has a complete set of model functions, parameters for 13,208 USGS streamflow gages, and a script to run the model. Instructions and software requirements for running the model... Categories: Data, Data Release - Revised; Tags: USGS Science Data Catalog (SDC), United States, baseflow, hydrograph separation, mathematical modeling, All tags... streamflow, Fewer tags Digitized Maps of the Potentiometric Surface of the Sparta Aquifer in North-Central Louisiana, 1886 to 2012 (ver. 1.1, April 2021) The Sparta aquifer is a primary source of groundwater in north-central Louisiana with more than 60 million gallons of water per day being withdrawn in 2015, and public supply and Industry account for over 90 percent of the water-use demand from the Sparta aquifer (Collier, 2018). Concentrated withdrawals from the Sparta aquifer have caused regional water-level declines within the Sparta aquifer (McGee and Brantly, 2015). Widespread concern about the potential effects of declining water levels has brought forth many questions regarding the sustainability of the aquifer as well as continued saltwater intrusion. In cooperation with the Louisiana Department of Transportation and Development, the U.S. Geological Survey... Categories: Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Arkansas, Kentucky, Louisiana, Memphis aquifer, Mississippi, All tags... Mississippi Embayment, Missouri, Sparta Aquifer, Sparta Sand, Tennessee, USGS Science Data Catalog (SDC), freshwater extent, groundwater, potentiometric surface, volume change, water-level, Fewer tags « 1 2 3 4 5 ... 18 »