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Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska A systematic water-quality study of the Fortymile River and many of its major tributaries in eastern Alaska was conducted in June of 1997 and 1998. Surface-water samples were collected for chemical analyses to establish regional baseline geochemistry values and to evaluate the possible environmental effects of suction-dredge placer gold mining and bulldozer-operated placer gold mining (commonly referred to as “cat mining”). In general, the water quality of the Fortymile River is very good, with low total dissolved solids and only two cases in which the concentration of any element exceeded primary or secondary drinking-water quality standards. In both cases, iron exceeded secondary drinking-water limits. At... Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Adaptation planning 1-Best management practices, Baseline 2-Maps of Anthropogenic Disturbances, Monitoring 5-Physical Science, landscape scale conservation: Human Activity Streamgage and basin outline shapefiles for the Red River of the North This data shows select streamgage locations throughout the Red River of the North Basin upstream of Emerson, Manitoba, and basin outlines for eight subbasins.. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Crookston, Emerson, Fargo, Halstad, Kindred, All tags... Manitoba, Minnesota, Neche, North Dakota, Pembina River, Red Lake River, Red River of the North, Sheyenne River, phosphorus, surface water quality, Fewer tags Tsunami Evacuation Travel Time Map for Del Norte County, CA, 2010, for Bridges Intact and a Fast Walking Speed The travel time map was generated using the Pedestrian Evacuation Analyst model from the USGS. The travel time analysis uses ESRI's Path Distance tool to find the shortest distance across a cost surface from any point in the hazard zone to a safe zone. This cost analysis considers the direction of movement and assigns a higher cost to steeper slopes, based on a table contained within the model. The analysis also adds in the energy costs of crossing different types of land cover, assuming that less energy is expended walking along a road than walking across a sandy beach. To produce the time map, the evacuation surface output from the model is grouped into 1-minute increments for easier visualization. The times in... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Del Norte County, evacuation, hazard preparedness, hazards, tsunamis, All tags... vulnerability, Fewer tags Marine Arctic polygon distribution of Arctic Lamprey (Lethenteron camtschaticum) (Tilesius, 1811) Region(s) of distribution of Arctic Lamprey (Lethenteron camtschaticum) (Tilesius, 1811) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: (Tilesius, 1811), Alaska, Arctic, Arctic, Arctic Lamprey, All tags... Beaufort Sea, Bering Sea, Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Lethenteron camtschaticum, Northwest Territories, Nunavut, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Arctic Flounder (Liopsetta glacialis) (Pallas, 1776) Region(s) of distribution of Arctic Flounder (Liopsetta glacialis) (Pallas, 1776) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: (Pallas, 1776), Alaska, Arctic, Arctic, Arctic Flounder, All tags... Beaufort Sea, Bering Sea, Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Liopsetta glacialis, Northwest Territories, Nunavut, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Chum Salmon (Oncorhynchus keta) (Walbaum, 1792) Region(s) of distribution of Chum Salmon (Oncorhynchus keta) (Walbaum, 1792) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: (Walbaum, 1792), Alaska, Arctic, Arctic, Beaufort Sea, All tags... Bering Sea, Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Chum Salmon, Distributions, Northwest Territories, Nunavut, Oncorhynchus keta, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Pink Salmon (Oncorhynchus gorbuscha) (Walbaum, 1792) Region(s) of distribution of Pink Salmon (Oncorhynchus gorbuscha) (Walbaum, 1792) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: (Walbaum, 1792), Alaska, Arctic, Arctic, Beaufort Sea, All tags... Bering Sea, Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Northwest Territories, Nunavut, Oncorhynchus gorbuscha, Pink Salmon, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Gelatinous Seasnail (Liparis fabricii) Krøyer, 1847 Region(s) of distribution of Gelatinous Seasnail (Liparis fabricii) Krøyer, 1847 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alaska, Arctic, Arctic, Beaufort Sea, Bering Sea, All tags... Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Gelatinous Seasnail, Krøyer, 1847, Liparis fabricii, Northwest Territories, Nunavut, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Atlantic Poacher (Leptagonus decagonus) (Bloch & Schneider, 1801) Region(s) of distribution of Atlantic Poacher (Leptagonus decagonus) (Bloch & Schneider, 1801) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: (Bloch & Schneider, 1801), Alaska, Arctic, Arctic, Atlantic Poacher, All tags... Beaufort Sea, Bering Sea, Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Leptagonus decagonus, Northwest Territories, Nunavut, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Bigeye Sculpin (Triglops nybelini) Jensen, 1944 Region(s) of distribution of Bigeye Sculpin (Triglops nybelini) Jensen, 1944 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alaska, Arctic, Arctic, Beaufort Sea, Bering Sea, All tags... Bering Strait, Bigeye Sculpin, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Jensen, 1944, Northwest Territories, Nunavut, Triglops nybelini, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Groundwater Levels in the Equus Beds Aquifer near Wichita, Kansas, January 2016 (deep contours shapefile) This dataset is the result of measurements of groundwater levels in the Equus Beds aquifer near Wichita, Kansas, in January 2016. Potentiometric surfaces are interpolated for the shallow and deep parts of the aquifer, and rasters of the potentiometric surfaces are included in this data release. Wells were classified as being screened in the shallow or deep parts of the aquifer based on station name (some wells have a layer identifier in the station name) or, if no indication of aquifer layer was given in the station name, based on the depth of the well; wells with depths less than 80 feet below land surface were classified as shallow and wells with depths of 80 feet or deeper were classified as deep. Contours with... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas River, Bentley, Burrton, Equus Beds aquifer, Halstead, All tags... Harvey County, High Plains aquifer, Kansas, Kisiwa Creek, Little Arkansas River, Sedgwick, Sedgwick County, Wichita, aquifer, groundwater, groundwater level, hydrology, water-level altitude, Fewer tags Echosounder Points, Schoharie Reservoir, 2014 From 2013 to 2015, bathymetric surveys of New York City’s six West of Hudson reservoirs (Ashokan, Cannonsville, Neversink, Pepacton, Rondout, and Schoharie) were performed to provide updated capacity tables and bathymetric maps. Depths were surveyed with a single-beam echo sounder and real-time kinematic global positioning system (RTK-GPS) along planned transects at predetermined intervals for each reservoir. A separate set of echo sounder data was collected along transects at oblique angles to the main transects for accuracy assessment. Field survey data was combined with water-surface elevations in a geographic information system to create three-dimensional surfaces representing reservoir-bed elevations in the... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Delaware County, GPS measurement, Greene County, Schoharie County, Schoharie Reservoir, All tags... bathymetry, single-beam echo sounder, Fewer tags Echosounder Points, Neversink Reservoir, 2014 From 2013 to 2015, bathymetric surveys of New York City’s six West of Hudson reservoirs (Ashokan, Cannonsville, Neversink, Pepacton, Rondout, and Schoharie) were performed to provide updated capacity tables and bathymetric maps. Depths were surveyed with a single-beam echo sounder and real-time kinematic global positioning system (RTK-GPS) along planned transects at predetermined intervals for each reservoir. A separate set of echo sounder data was collected along transects at oblique angles to the main transects for accuracy assessment. Field survey data was combined with water-surface elevations in a geographic information system to create three-dimensional surfaces representing reservoir-bed elevations in the... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GPS measurement, Neversink Reservoir, Sulllivan County, bathymetry, single-beam echo sounder Tsunami Evacuation Travel Time Map for Humboldt County, CA, 2010, for Bridges Removed and a Fast Walking Speed The travel time map was generated using the Pedestrian Evacuation Analyst model from the USGS. The travel time analysis uses ESRI's Path Distance tool to find the shortest distance across a cost surface from any point in the hazard zone to a safe zone. This cost analysis considers the direction of movement and assigns a higher cost to steeper slopes, based on a table contained within the model. The analysis also adds in the energy costs of crossing different types of land cover, assuming that less energy is expended walking along a road than walking across a sandy beach. To produce the time map, the evacuation surface output from the model is grouped into 1-minute increments for easier visualization. The times in... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Humboldt County, evacuation, hazard preparedness, hazards, tsunamis, All tags... vulnerability, Fewer tags Groundwater Levels in the Equus Beds Aquifer near Wichita, Kansas, January 2016 (shallow contours shapefile) This dataset is the result of measurements of groundwater levels in the Equus Beds aquifer near Wichita, Kansas, in January 2016. Potentiometric surfaces are interpolated for the shallow and deep parts of the aquifer, and rasters of the potentiometric surfaces are included in this data release. Wells were classified as being screened in the shallow or deep parts of the aquifer based on station name (some wells have a layer identifier in the station name) or, if no indication of aquifer layer was given in the station name, based on the depth of the well; wells with depths less than 80 feet below land surface were classified as shallow and wells with depths of 80 feet or deeper were classified as deep. Contours with... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas River, Bentley, Burrton, Equus Beds aquifer, Halstead, All tags... Harvey County, High Plains aquifer, Kansas, Kisiwa Creek, Little Arkansas River, Sedgwick, Sedgwick County, Wichita, aquifer, groundwater, groundwater level, hydrology, water-level altitude, Fewer tags Marine Arctic polygon distribution of Shulupaoluk (Lycodes jugoricus) Knipowitsch, 1906 Region(s) of distribution of Shulupaoluk (Lycodes jugoricus) Knipowitsch, 1906 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alaska, Arctic, Arctic, Beaufort Sea, Bering Sea, All tags... Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Knipowitsch, 1906, Lycodes jugoricus, Northwest Territories, Nunavut, Shulupaoluk, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Sakhalin Sole (Limanda sakhalinensis) Hubbs, 1915 Region(s) of distribution of Sakhalin Sole (Limanda sakhalinensis) Hubbs, 1915 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alaska, Arctic, Arctic, Beaufort Sea, Bering Sea, All tags... Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Hubbs, 1915, Limanda sakhalinensis, Northwest Territories, Nunavut, Sakhalin Sole, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Arctic Staghorn Sculpin (Gymnocanthus tricuspis) (Reinhardt, 1830) Region(s) of distribution of Arctic Staghorn Sculpin (Gymnocanthus tricuspis) (Reinhardt, 1830) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: (Reinhardt, 1830), Alaska, Arctic, Arctic, Arctic Staghorn Sculpin, All tags... Beaufort Sea, Bering Sea, Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Gymnocanthus tricuspis, Northwest Territories, Nunavut, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Marine Arctic polygon distribution of Halfbarred Pout (Gymnelus hemifasciatus) Andriashev, 1937 Region(s) of distribution of Halfbarred Pout (Gymnelus hemifasciatus) Andriashev, 1937 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alaska, Andriashev, 1937, Arctic, Arctic, Beaufort Sea, All tags... Bering Sea, Bering Strait, Chukchi Sea, Chukchi-Beaufort Lease Area, Distributions, Gymnelus hemifasciatus, Halfbarred Pout, Northwest Territories, Nunavut, U.S. Exclusive Economic Zone, Yukon, biogeography, ecology, fish, marine, marine fishery resources, northeast Russia, northwest Canada, Fewer tags Western Lake Erie Restoration Assessment Dikes (2016) This dataset is the output of a python script/ArcGIS model that identifes dikes as having a difference in elevation above a certain threshold. If the elevation difference was below a certain threshold the area was not considered a dike; however, if the difference in elevation between two points was significantly high then the area was marked as a dike. Areas continuous with eachother were considered part of the same dike. Post processing occured. Users examined the data output, comparing the proposed dike locations to aerial imagery, flowline data, and the DEM. Dikes that appeared to be false positives were deleted from the data set. These data include parameter inputs from external sources current to 2016. For... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Great Lakes, LIDAR, Lake Erie, biogeography, coastal ecosystems, All tags... coastal processes, connectivity, decision support methods, digital elevation models, dikes, drainage, ecological processes, environmental assessment, estuarine ecosystems, estuarine processes, freshwater ecosystems, geodesign, geographic information systems, geography, geospatial analysis, geospatial datasets, habitats, hydrographic datasets, interagency programs, land use change, restoration, surface-water level, water resources, wetland ecosystems, wetland functions, Fewer tags « 1 2 3 4 5 ... 16 »