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USGS Water-Quality Data for the Nation - National Water Information System (NWIS)
The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands,... -
Watershed Boundary Dataset (WBD) - USGS National Map Downloadable Data Collection NGDA
The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It... -
National Hydrography Dataset (NHD) - USGS National Map Downloadable Data Collection NGDA
The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface... -
1/3rd arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection NGDA
This is a tiled collection of the 3D Elevation Program (3DEP) and is 1/3 arc-second (approximately 10 m) resolution. The 3DEP data holdings serve as the elevation layer of The... -
USGS Surface-Water Data for the Nation - National Water Information System (NWIS)
The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands,... -
USGS Groundwater Data for the Nation - National Water Information System (NWIS)
The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands,... -
USGS Water Use Data for the Nation - National Water Information System (NWIS)
The U.S. Geological Survey's National Water-Use Information Program is responsible for compiling and disseminating the nation's water-use data. The USGS works in cooperation... -
Base-flow index grid for the conterminous United States
This 1-kilometer raster (grid) dataset for the conterminous United States was created by i nterpolating base-flow index (BFI) values estimated at U.S. Geological Survey (USGS)... -
Hydrologic landscape regions of the United States
Hydrologic landscape regions (HLRs) in the United States were delineated by using geographic information system (GIS) tools and statistical methods including principal... -
Attributes for NHDPlus Catchments (Version 1.1): Level 3 Nutrient Ecoregions, 2002
This data set represents the area of each level 3 nutrient ecoregion in square meters, compiled for every catchment of NHDPlus for the conterminous United States. The source... -
Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: Hydrologic Landscape Regions
This data set represents the area of Hydrologic Landscape Regions (HLR) compiled for every catchment of NHDPlus for the conterminous United States. The source data set is a... -
Attributes for NHDplus Catchments (Version 1.1) for the Conterminous United States: Population Density, 2000
This data set represents the average population density, in number of people per square kilometer multiplied by 10 for the year 2000, compiled for every catchment of NHDPlus for... -
Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: STATSGO Soil Characteristics
This data set represents estimated soil variables compiled for every catchment of NHDPlus for the conterminous United States. The variables included are cation exchange... -
Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: Physiographic Provinces
This dataset represents the area of each physiographic province (Fenneman and Johnson, 1946) in square meters, compiled for every catchment of NHDPlus for the conterminous... -
Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: NLCD 2001 Land Use and Land Cover
This data set represents the estimated area of land use and land cover from the National Land Cover Dataset 2001 (LaMotte, 2008), compiled for every catchment of NHDPlus for the... -
Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: Level 3 Ecoregions
This data set represents the estimated area of level 3 ecological landscape regions (ecoregions), as defined by Omernik (1987), compiled for every catchment of NHDPlus for the... -
Attributes for NHDPlus Catchments (Version 1.1)for the Conterminous United States: Contact Time, 2002
This data set represents the average contact time, in units of days, compiled for every catchment of NHDPlus for the conterminous United States. Contact time, as described in... -
Attributes for NHDPlus Catchments (Version 1.1) in the Conterminous United States: Bedrock Geology
This data set represents the area of bedrock geology types in square meters compiled for every catchment of NHDPlus for the conterminous United States. The source data set is...
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