U.S. Geological Survey 2026 vector digital data Reston, Virginia U.S. Geological Survey https://www.sciencebase.gov/catalog/item/67890afcd34e637252b872a5 https://www.usgs.gov/the-national-map-data-delivery https://www.usgs.gov/3d-hydrography-program https://apps.nationalmap.gov/downloader/ The 3D Hydrography Program (3DHP) data is an integrated, National, 3D-enabled hydrologic dataset derived from the USGS 3D Elevation Program (3DEP) data. For areas where Elevation-derived Hydrography (EDH) has not yet been collected, 3DHP data is supplemented by hydrologic vector data from the National Hydrography Dataset (NHD). As further EDH data is collected, it will replace the NHD data in those areas. 3DHP data ingested from EDH sources includes ‘value added’ catchments and flowline network derivative attributes. All the data is open and non-proprietary. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. This dataset is not intended to be used for site-specific regulatory determinations. 3DHP datasets include a three-dimensional (3D) hydrography network generated from, and integrated with, elevation data from the 3DEP to better represent stream gradients and channel conditions, along with waterbodies, hydrologic units, hydrologically enhanced elevation and other surfaces, and more consistent and accurate attributes. These data create a scalable 3D-in-part geospatial hydrography framework for general purpose use in geospatial analysis, visualization, modeling, cartography and other use cases The product represents the 3DHP dataset and the schema as of September 30, 2025. Future Annual Staged Product releases will reflect the schema at the time the product is generated and include more EDH-sourced hydrologic data holdings. 2024 present publication date Complete Annual -179.136572 -66.951381 71.352561 24.514909 USGS Metadata Identifier USGS:4e10157a-e4fd-41bf-aff0-6c537d7efbdf ISO 19115 Topic Category inlandWaters USGS Thesaurus geospatial analysis streamflow hydrographic datasets hydrology water resources river systems land surface characteristics topography cartography earth sciences geographic information systems digital elevation models surface water quality streamflow water resources stream discharge hydrologic maps geospatial datasets lidar IFSAR surface water (non-marine) geographic names none streams rivers lakes reservoirs hydrographic features channels waterbodies watersheds drainage basins catchment 3DHP open data EDH 3d-hydrography-program 3dep 3D-enabled hydro-enforced elevation derived hydrography National Open Geospatial Consortium GeoPackage 1.2 Geographic Names Information System United States US None All data are open and non-proprietary. Users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data U.S. Geological Survey mailing and physical address

12201 Sunrise Valley Drive

Reston VA 20192 1-888-ASK-USGS (1-888-275-8747) tnm_help@usgs.gov Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA Please visit https://answers.usgs.gov/, call 1-888-ASK-USGS or email tnm_help@usgs.gov to contact us. https://prd-tnm.s3.amazonaws.com/StagedProducts/Collections/Browse/3dhp_browse.jpg Thumbnail JPG image JPEG U.S. Geological Survey None Unclassified None Attributes are not systematically verified. Attribute errors may be present. Topological tests have not been completed, some disconnected features are possible. Not all hydrologic features on the ground (e.g. stream/river, lake/pond, etc.) may be mapped, and changes may have occurred since originally mapped. The level of mapping detail varies by geographic area. The USGS jointly manages these data with local and regional data stewards, usually at the State level, and some variations in content occur based on differences in local/regional stewardship. Horizontal accuracy for source data may be available in the original source product metadata file where available. Vertical accuracy for elevation data may be available in the original source product metadata file where available. U.S. Geological Survey Unknown vector digital data https://www.usgs.gov/ngp-standards-and-specifications/elevation-derived-hydrography-specifications Geospatial dataset 2021 present publication date EDH Elevation-Derived Hydrography (EDH) is a method used by the U.S. Geological Survey (USGS) to create accurate water flow pattern maps and surface water datasets. EDH utilizes lidar and IFSAR data, human-built features, and landscape classifications. EDH was used for populating the hydrologic unit 19050401 in Alaska. U.S. Geological Survey Unknown vector digital data https://www.usgs.gov/national-hydrography U.S. Geological Survey https://www.usgs.gov/national-hydrography/national-hydrography-dataset Geospatial Dataset 2016 2021 publication date NHD NHD data was used for the 3DHP 'national backbone', that is to get hydrologic coverage across the Nation. It was created in conjunction with the most current WBD, and 3DEP DEMs to create a hydro-enforced DEM for generation of the catchment raster and feature class, and flow direction/accumulation rasters, and used to compute and assign NHDFlowline Value Added Attributes (VAAs) in 3DHP (more details are available in the product's ReadMe file included as part of this dataset.) NHD data were used to populate this initial 3DHP dataset. 2024 Vector 0.00001 0.00001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137 298.2572221 North American Vertical Datum of 1988 0.001 meters Implicit coordinate An attribute summary can be found in the READMEs provided with the annual release. README PDF documents are provided with the annual release when downloaded. These documents include a summary of all attributes, as well as additional information about the data. U.S. Geological Survey - National Geospatial Program mailing and physical address

12201 Sunrise Valley Drive

Reston VA 20192 USA 1-888-ASK-USGS (1-888-275-8747) tnm_help@usgs.gov Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA Please visit https://answers.usgs.gov/, call 1-888-ASK-USGS or email tnm_help@usgs.gov to contact us. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Downloads https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/3DHP/ USGS TNM GIS Data Download: https://www.usgs.gov/the-national-map-data-delivery/gis-data-download None usgs_3dhp_all (MapServer) 1.0 https://www.esri.com/en-us/arcgis/open-vision/initiatives/standards-specifications An ArcGIS REST service for visualizing 3DHP data. https://3dhp.nationalmap.gov/arcgis/rest/services/usgs_3dhp_all/MapServer None usgs_3dhp_all (FeatureServer) 1.0 https://www.esri.com/en-us/arcgis/open-vision/initiatives/standards-specifications An ArcGIS REST service for visualizing 3DHP data. https://3dhp.nationalmap.gov/arcgis/rest/services/usgs_3dhp_all/FeatureServer None 20260514 U.S. Geological Survey - National Geospatial Program mailing and physical address

12201 Sunrise Valley Drive

Reston VA 20192 USA 1-888-275-8747 tnm_help@usgs.gov Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA Please visit https://answers.usgs.gov/, call 1-888-ASK-USGS or email tnm_help@usgs.gov to contact us. FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time None None None Unclassified None