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Percent impervious surface for selected Chesapeake Bay watersheds This dataset contains watershed means of estimated percent impervious surfaces for three time periods: 1992, 2002, and 2012. Estimates are based on coefficients derived from comparing land use of the 2012 NAWQA Wall-to-wall Anthropogenic Land-use Trends (NWALT) product to the 2011 National Land Cover Database (NLCD) imperviousness, then applying those coefficients to previous years (1974-2002) of the NWALT dataset. Categories: Data; Types: Citation; Tags: Chesapeake Bay, Delaware, District of Columbia, James River, Maryland, All tags... New York, Pennsylvania, Potomac River, Rappahannock River, Susquehanna River, Virginia, West Virginia, impervious surfaces, surface water quality, Fewer tags Data on denitrification and ecological characteristics of nontidal floodplains, Chesapeake Bay watershed, USA, 2013-2016 This data set presents attributes of floodplain ecosystem characteristics including floodplain soil denitrification, floodplain soil biogeochemistry, floodplain vegetation, floodplain sedimentation, floodplain and channel morphometry, stream discharge and water quality, floodplain climate, floodplain physiographic region, and catchment land cover. Attributes are associated with 18 floodplains of the Chesapeake Bay watershed. For many of these attributes, mean values are summaries of multiple measurements made within each floodplain site. Categories: Data; Tags: Maryland, Pennsylvania, USGS Science Data Catalog (SDC), Virginia, West Virginia, All tags... air temperature, alluvial soil, biogeochemistry, climate, denitrification, floodplains, land cover, nitrogen, riparian soil, rivers, season, sediment deposition, soil, streams, Fewer tags Nearshore Water Quality Collected on Lake Erie on June 24, 2015, August 11, 2015, and August 19, 2015 This data release supports the following publication: Hittle, Elizabeth, 2017, Longshore water-current velocity and the potential for transport of contaminants: A pilot study in Lake Erie from Walnut Creek to Presque Isle State Park Beaches, Erie, Pennsylvania, June and August 2015: U.S. Geological Survey Open-File Report 2016–1206 126 p., https://doi.org/10.3133/ofr20161206 Water-quality grab samples were collected about a meter from shore and coincide with the 25 longshore water-current velocity transects as closely as conditions would allow. Nearshore water-quality grab samples were collected on June 24, August 11, and August 19, 2015. Samples were analyzed for bacteria concentration, temperature, specific condictivity,... Categories: Data; Tags: Erie County, Lake Erie, Pennsylvania, Presque Isle State Park, Suspended Sediment, All tags... Water Quality, Fewer tags Estimated Use of Water by Subbasin (HUC8) and Subwatershed (HUC12) in the Delaware River Basin, 2010 These datasets present offstream water use estimates from 2010 which are aggregated to the 8-digit (subbasin) and 12-digit (subwatershed) hydrologic unit level for the Delaware River Basin. The data support USGS Scientific Investigations Report 2015-5142. Categories: Data; Tags: DE, Delaware, Delaware River, Delaware River Basin, NJ, All tags... NY, New Jersey, New York, PA, Pennsylvania, USGS Science Data Catalog (SDC), Water Resources, water use, water withdrawals, withdrawals, Fewer tags South Dakota: NFHAP 2010 HCI Scores and Disturbances This shapefile contains landscape factors representing human disturbances summarized to local and network catchments of river reaches for the state of South Dakota. This dataset is the result of clipping the feature class 'NFHAP 2010 HCI Scores and Human Disturbance Data for the Conterminous United States linked to NHDPLUSV1.gdb' to the state boundary of South Dakota. Landscape factors include land uses, population density, roads, dams, mines, and point-source pollution sites. The source datasets that were compiled and attributed to catchments were identified as being: (1) meaningful for assessing fish habitat; (2) consistent across the entire study area in the way that they were assembled; (3) representative of... Categories: Data; Types: ArcGIS REST Map Service, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Anthropogenic factors, Aquatic habitats, Atlantic Coast FHP, Catchment areas, Connecticut, All tags... DC, Delaware, Environmental conditions, Florida, Georgia, Habitat suitability, Inland water environments, Landscape ecology, Linked to the National Hydrography Dataset Plus (1:100,000), Maine, Maryland, Massachusetts, National Assessment Data, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, River basins, Rivers, South Carolina, Spatial Data, Stream Characterization, Streams, Vermont, Virginia, Water quality measurement, West Virginia, Fewer tags Georgia: NFHAP 2010 HCI Scores and Disturbances This shapefile contains landscape factors representing human disturbances summarized to local and network catchments of river reaches for the state of Georgia. This dataset is the result of clipping the feature class 'NFHAP 2010 HCI Scores and Human Disturbance Data for the Conterminous United States linked to NHDPLUSV1.gdb' to the state boundary of Georgia. Landscape factors include land uses, population density, roads, dams, mines, and point-source pollution sites. The source datasets that were compiled and attributed to catchments were identified as being: (1) meaningful for assessing fish habitat; (2) consistent across the entire study area in the way that they were assembled; (3) representative of conditions... Categories: Data; Types: ArcGIS REST Map Service, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Anthropogenic factors, Aquatic habitats, Atlantic Coast FHP, Catchment areas, Connecticut, All tags... DC, Delaware, Environmental conditions, Florida, Georgia, Habitat suitability, Inland water environments, Landscape ecology, Linked to the National Hydrography Dataset Plus (1:100,000), Maine, Maryland, Massachusetts, National Assessment Data, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, River basins, Rivers, South Carolina, Spatial Data, Stream Characterization, Streams, Vermont, Virginia, Water quality measurement, West Virginia, Fewer tags Louisiana: NFHAP 2010 HCI Scores and Disturbances This shapefile contains landscape factors representing human disturbances summarized to local and network catchments of river reaches for the state of Louisiana. This dataset is the result of clipping the feature class 'NFHAP 2010 HCI Scores and Human Disturbance Data for the Conterminous United States linked to NHDPLUSV1.gdb' to the state boundary of Louisiana. Landscape factors include land uses, population density, roads, dams, mines, and point-source pollution sites. The source datasets that were compiled and attributed to catchments were identified as being: (1) meaningful for assessing fish habitat; (2) consistent across the entire study area in the way that they were assembled; (3) representative of conditions... Categories: Data; Types: ArcGIS REST Map Service, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Anthropogenic factors, Aquatic habitats, Atlantic Coast FHP, Catchment areas, Connecticut, All tags... DC, Delaware, Environmental conditions, Florida, Georgia, Habitat suitability, Inland water environments, Landscape ecology, Linked to the National Hydrography Dataset Plus (1:100,000), Maine, Maryland, Massachusetts, National Assessment Data, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, River basins, Rivers, South Carolina, Spatial Data, Stream Characterization, Streams, Vermont, Virginia, Water quality measurement, West Virginia, Fewer tags Chesapeake Bay River Input Monitoring Network 1985-2019: WRTDS output data Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay River Input Monitoring Network (RIM) stations for the period 1985 through 2019. 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). The load results represent the total mass of nitrogen, phosphorus, and suspended sediment that was exported from each of the RIM watersheds. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Chesapeake Bay Watershed, Delaware, Maryland, New York, Pennsylvania, All tags... United States, Virginia, WRTDS, Washington DC, West Virginia, load analysis, nitrogen, nutrients, phosphorus, rivers, suspended sediment, trends, water quality, weighted regression, Fewer tags Exploring the exceptional performance of a deep learning stream temperature model and the value of streamflow data: 3 Model inputs This data release component contains model inputs including river basin attributes, weather forcing data, and simulated and observed river discharge. Categories: Data; Tags: AL, Alabama, DE, Delaware, GA, All tags... Georgia, IA, ID, Idaho, Iowa, KS, Kansas, MA, MD, ME, MI, MS, Maine, Maryland, Massachusetts, Michigan, Mississippi, NC, NJ, NM, NV, NY, Nevada, New Jersey, New Mexico, New York, North Carolina, OH, OK, OR, Ohio, Oklahoma, Oregon, PA, Pennsylvania, RI, Rhode Island, SC, South Carolina, TN, TX, Tennessee, Texas, US, UT, United States, Utah, VA, Virginia, WA, WI, WV, WY, Washington, West Virginia, Wisconsin, Wyoming, deep learning, environment, inlandWaters, machine learning, modeling, streams, water resources, water temperature, Fewer tags National Fish Habitat Action Plan (NFHAP) 2010 HCI Scores and Human Disturbance Data (linked to NHDPLUSV1) for Desert Fish Habitat Partnership This shapefile contains landscape factors representing human disturbances summarized to local and network catchments of river reaches for the Desert Fish Habitat Partnership. This dataset is the result of clipping the feature class 'NFHAP 2010 HCI Scores and Human Disturbance Data for the Conterminous United States linked to NHDPLUSV1.gdb' to the boundary of the Desert Fish Habitat Partnership. Landscape factors include land uses, population density, roads, dams, mines, and point-source pollution sites. The source datasets that were compiled and attributed to catchments were identified as being: (1) meaningful for assessing fish habitat; (2) consistent across the entire study area in the way that they were assembled;... Categories: Data; Types: ArcGIS REST Map Service, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Anthropogenic factors, Aquatic habitats, Atlantic Coast FHP, Catchment areas, Connecticut, All tags... DC, Delaware, Environmental conditions, Florida, Georgia, Habitat suitability, Inland water environments, Landscape ecology, Linked to the National Hydrography Dataset Plus (1:100,000), Maine, Maryland, Massachusetts, National Assessment Data, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, River basins, Rivers, South Carolina, Spatial Data, Stream Characterization, Streams, Vermont, Virginia, Water quality measurement, West Virginia, Fewer tags Lake Erie Ecological Investigations 1980-2000: Benthic Invertebrate Community Analysis This Benthic Invertebrate Community Analysis dataset, a conceptual subgroup of the Lake Erie Ecological Investigations (LEEI) dataset, focuses on the benthic invertebrates sampled at Areas of Concern (AOCs) on Lake Erie. Per the Quality Assurance Project Plan (QAPP), the invertebrate samples were taken from sediments remaining from the sediment analysis. Identification of the invertebrates was completed by the same invertebrate taxonomist for both the 1998-2000 evaluation and 1986-87 historical evaluation (Smith et al. 1994) for increased consistency. Oligochaetes were identified to species if possible, chironomids were identified to genus, as adult specimens are needed for specific identification, and other taxa... Categories: Data; Tags: AOCs, Ameiurus nebulosus, Ashtabula, Ashtabula River, Black River, All tags... Black River, Buffalo, Buffalo River, Cleveland Harbor, Cleveland Harbor, Cuyahoga River, Cuyahoga River, Detroit, Detroit River, Detroit River, Great Lakes, Great Lakes, Great Lakes, Great Lakes Areas of Concern, Huron River, Lake Erie, Lake Erie, Lake Erie, Lake or marine sediment, Love Canal (historical), Maumee River, Michigan, Michigan, Mud Brook, Mud Brook, New York, New York, Niagara River, Niagara River, Ohio, Ohio, Old River, Old Woman Creek, Old Woman Creek, Ottawa River, PAHs, PCBs, Pennsylvania, Pennsylvania, Presque Isle Bay, Presque Isle Bay, aquatic ecosystems, benthos, benthos, biomarkers, biota, brown bullhead, contamination and pollution, datasets, ecotoxicology, environment, field sampling, fish, fish, freshwater ecosystems, heavy metal pollution, histology, industrial pollution, inlandWaters, invertebrates, invertebrates, liver tumors, metal elements, pathology, pesticide and herbicide contamination, plant and animal testing, polyaromatic hydrocarbons, polychlorinated biphenyls, population and community ecology, remediation, sediment, sediment analysis, species diversity, specimen collecting, toxic trace element contamination, water resources, Fewer tags 1) Best management practice implementation in the Chesapeake Bay watershed from 1985 to 2014 This metadata record documents 11 comma delimited tables representing the amount of reported best management practice (BMP) implementation for the years from 1985 to 2014 at three geographic scales: county or land-river modeling segment, River Input Monitoring (RIM) station drainage areas, and the entire Chesapeake Bay Watershed (CBWS). Data originated from the Chesapeake Bay Watershed jurisdictions including Maryland, Pennsylvania, Virginia, Delaware, New York, West Virginia, and the District of Columbia. Data were reported to the Chesapeake Bay Program for an annual review of progress toward meeting nitrogen, phosphorus, and sediment reduction goals. Categories: Data; Tags: Animal, Appomattox River, BMP, Best management practice, Chesapeake Bay, All tags... Chesapeake Bay watershed, Choptank River, Conservation practice, Delaware, District of Columbia, Isolation scenarios, James River, Land use, Land use change, Load reduction, Maryland, Mattaponi River, New York, Nitrogen, Non-RIM Eastern Shore, Non-RIM Western Shore, Nutrient sources, Pamunkey River, Patuxent River, Pennsylvania, Phosphorus, Potomac River, Rappahannock River, Sediment, Susquehanna River, USA, United States, Virginia, Watershed Model, West Virginia, Fewer tags Official Recognized Boundary of Eastern Brook Trout Joint Venture, 2013 This shapefile is the official boundary of the Eastern Brook Trout Joint Venture. The boundary was originally developed by the United States Fish and Wildlife Service and was updated in 2013 to reflect revisions from the Eastern Brook Trout Joint Venture, a recognized Fish Habitat Partnership (FHP) of the National Fish Habitat Partnership. Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, GeoTIFF, Map Service, Raster; Tags: Analytical boundary, Aquatic habitats, Boundaries, EBTJV, FHP Boundary, All tags... FHP Product, Fish habitats, Maine, Massachusetts, New Hampshire, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Spatial Data, Vermont, Virginia, Visual, Fewer tags Nitrogen, phosphorus, and suspended-sediment loads and trends measured at the Chesapeake Bay Nontidal Network stations: Water years 1985-2018 (ver. 2.0, May 2020) Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major 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). The load results represent the total mass of nitrogen, phosphorus, and suspended sediment that was exported from each of the NTN watersheds. To determine the trend in loads, the annual load results are flow normalized to integrate out the year-to-year variability in river discharge.... 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, load analysis, nitrogen, nutrients, phosphorus, rivers, suspended sediment, trends, water quality, weighted regression, Fewer tags Global Geochemical Database for Critical Minerals in Archived Mine Samples The Critical Minerals in Archived Mine Samples Database (CMDB) contains chemistry and geologic information for historic ore and ore-related rock samples from mineral deposits in the United States. In addition, the database contains samples from archetypal deposits from 27 other countries in North America, South America, Asia, Africa and Europe. Samples were obtained from archived ore collections under the U.S. Geological Survey's project titled "Quick Assessment of Rare and Critical Metals in Ore Deposits: A National Assessment" (2008 to 2013) in an effort to begin an assessment of the Nations' previously mined ore deposits for critical minerals. Mineralized and altered rock samples were provided by the Colorado... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alaska, Argentina, Arizona, Arkansas, Australia, All tags... Brazil, Burma, California, Canada, Chile, China, Colorado, Cuba, Democratic Republic of Congo, Economic Geology, Finland, Geochemistry, Germany, Honduras, Idaho, India, Indonesia, Japan, Kansas, Kentucky, Maine, Mauritania, Mexico, Michigan, Mineral Resources, Minnesota, Missouri, Montana, NGDB, Namibia, National Geochemical Database, Nevada, New Jersey, New Mexico, New York, North Carolina, Norway, Oklahoma, Oregon, Papua New Guinea, Pennsylvania, Peru, Philippines, Poland, Portugal, Russia, South Africa, South Carolina, South Dakota, Sweden, Tennessee, Texas, USGS Science Data Catalog (SDC), United States, Utah, Vietnam, Virginia, Washington, Wisconsin, Wyoming, Zambia, aluminum, antimony, arsenic, atomic emission spectroscopy, barium, beryllium, bismuth, boron, cadmium, calcium, cerium, chemical analysis, chromium, cobalt, copper, critical minerals, dysprosium, economic geology, erbium, europium, fluorine, gadolinium, gallium, geochemical data, geochemistry, geoscientific information, germanium, gold, hafnium, historic ores, holmium, indium, iron, lanthanum, lead, lithium, lutetium, magnesium, manganese, metallic mineral resources, mineral deposit type, mineral deposits, mineralogy, molybdenum, neodymium, nickel, niobium, nonmetallic mineral resources, palladium, phosphorus, platinum, potassium, praseodymium, rhenium, rock geochemistry, rocks and deposits, samarium, scandium, silicon, silver, strontium, sulfur, tantalum, tellurium, terbium, thallium, thorium, thulium, tin, titanium, tungsten, uranium, vanadium, ytterbium, yttrium, zinc, zirconium, Fewer tags Airborne Electromagnetic (AEM) Survey Inventory The U.S. Geological Survey (USGS) has been engaged in airborne electromagnetics (AEM) since the 1970s, playing a role in the development of early acquisition systems, developing calibration methods, refining standards for data acquisition, improving data processing, modeling, and interpretation methods, and expanding the range of AEM applications. However, USGS AEM survey visibility and data accessibility has not advanced as rapidly as our use of the technique. This data release catalogs AEM surveys in the United States that have contributed to studies under USGS programs including Water, Geologic Mapping, Minerals, Energy, Environmental Health, Ecosystems, Hazards, and Climate. This dataset contains locations for... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alabama, Arizona, Arkansas, California, Colorado, All tags... Connecticut, Delaware, Florida, Geophysics, 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), United States, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, electromagnetic surveying, frequency-domain, geophysics, geoscientificInformation, geospatial datasets, resistivity, time-domain, Fewer tags Compilation of Geologic and Seismic Velocity Characteristics at Advanced National Seismic System Strong Motion Accelerometer Sites Near-surface site characteristics are critical for accurately modeling ground motion, which in turn influences seismic hazard analysis and design of critical infrastructure. Currently, there are many strong motion accelerometers within the Advanced National Seismic System (ANSS) that are missing this information. We use a Geographic Information Systems (GIS) based framework to intersect the site coordinates of approximately 5,500 ANSS accelerometers located throughout the United States and its territories with geology and velocity information. We consider: (1) surficial geology from digitized geologic maps (Horton, 2017; Wilson et al., 2015; Sherrod et al., 2007; Bawiec, 1999; Saucedo, 2005; Bedrossian et al., 2012;... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: ANSS, Alabama, American Samoa, Arizona, Arkansas, All tags... California, Colorado, Connecticut, Delaware, Florida, Geography, Geophysics, Georgia, Guam, Idaho, Illinois, Indiana, Information Sciences, 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, Puerto Rico, Remote Sensing, Rhode Island, Seismic site characteristics, Seismology, Soil Sciences, South Carolina, South Dakota, Strong Motion, Structural Geology, Tennesee, Texas, USGS Science Data Catalog (SDC), United States, Utah, Vermont, Virginia, Vs30, Washington, West Virginia, Wisconsin, Wyoming, earthquake seismology, seismic stations, vs30 measurements, vs30 proxy, Fewer tags Benthic-macroinvertebrate and habitat data in Chester, Delaware, and Philadelphia Counties, Pennsylvania, 1998-2021 The Stream Conditions of Chester County Biological Monitoring Network was established by the U.S. Geological Survey and the Chester County Water Resources Authority in 1969. Benthic-macroinvertebrate, habitat, and stream chemistry data were collected annually from 1998-2021 at 18 fixed location sites. Additionally, nine flexible location sites were selected and sampled annually from 1998-2021. Some of the flexible location sites were sampled more than once over the study period. All data were collected in the fall months (October-November) during baseflow conditions. The benthic-macroinvertebrate data collected was used to calculate six metrics and to establish an index of biotic integrity for each sample, while... Categories: Data; Tags: Aquatic Biology, Chester County, Delaware County, Hydrology, Pennsylvania, All tags... Philadelphia County, USGS Science Data Catalog (SDC), Water Quality, biota, habitat quality, macroinvertebrates, Fewer tags Data compilation for regional synthesis of chemical characteristics of groundwater used for domestic supply in north-east and north-central Pennsylvania Groundwater quality data for 472 domestic well-water samples were retrieved from the USGS National Water Information System (NWIS) database and combined with descriptive information on the sampled well locations. The NWIS data for a sample, collected on the selected date, were averaged into a single record (one per well), and rounded according to USGS protocols. For evaluation and reporting, the water-quality data were further combined with physical attributes and classified by lithology, topographic position, physiographic province, region, redox, and pH (as standalone matrix, one row per well). A second data matrix file incorporating minimum reporting levels for censored and low-reported values (set to 0.99X highest... Categories: Data; Tags: Bradford County, Clinton County, Geochemistry, Groundwater Quality, Hydrology, All tags... Hydrology, Lycoming County, Pennsylvania, Pike County, Potter County, Sullivan County, USGS Science Data Catalog (SDC), Water Quality, Water Resources, Wayne County, Fewer tags Data for multiple linear regression models for estimating Escherichia coli (E. coli) concentrations or the probability of exceeding the bathing-water standard at recreational sites in Ohio and Pennsylvania as part of the Great Lakes NowCast, 2019 Site-specific multiple linear regression models were developed for one beach in Ohio (three discrete sampling sites) and one beach in Pennsylvania to estimate concentrations of Escherichia coli (E. coli) or the probability of exceeding the bathing-water standard for E. coli in recreational waters used by the public. Traditional culture-based methods are commonly used to estimate concentrations of fecal indicator bacteria, such as E. coli; however, results are obtained 18 to 24 hours post sampling and do not accurately reflect current water-quality conditions. Beach-specific mathematical models use environmental and water-quality variables that are easily and quickly measured as surrogates to estimate concentrations... Categories: Data; Tags: Environmental Health, Great Lakes, New York, Ohio, Pennsylvania, All tags... USGS Science Data Catalog (SDC), Water Quality, bacteria, economy, regression analysis, surface water (non-marine), water quality, Fewer tags 1 2 3 4 5 ... 27 »