EnviroAtlas - HU12_polygon

This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the entire United States. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "Federal Guidelines, Requirements, and Procedures for the National Watershed Boundary Dataset; Chapter 3 of Section A, Federal Standards, Book 11, Collection and Delineation of Spatial Data; Techniques and Methods 11-A3" (04/01/2009). http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/index.html . Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level subwatersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow modification.

Data and Resources

Field Value
__category_tag_16e15f51-d96e-4051-9124-75665abdc6ff ["Water"]
access_constraints ["Use Constraints: The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in the U.S.A. The NRCS should be acknowledged as the data source in products derived from these data. The Watershed Boundary Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application of the data. Federal, State, or local regulatory bodies are not to reassign to the Natural Resources Conservation Service any authority for the decisions they make. The Natural Resources Conservation Service will not perform any evaluations of these maps or purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these maps to scales greater than that at which they were originally delineated can result in misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data from the source distributor.", "Access Constraints: None"]
bbox-east-long -12.68151645
bbox-north-lat 61.7110157
bbox-south-lat 6.65223303
bbox-west-long -138.21454852
contact-email EnviroAtlas@epa.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2012-01-01"}]
frequency-of-update asNeeded
licence ["https://edg.epa.gov/EPA_Data_License.htm"]
licence_url https://edg.epa.gov/EPA_Data_License.htm
metadata-date 2020-10-16
metadata-language eng; USA
metadata_type geospatial
old-spatial {"type": "Polygon", "coordinates": [[[-138.21454852, 6.65223303], [-12.68151645, 6.65223303], [-12.68151645, 61.7110157], [-138.21454852, 61.7110157], [-138.21454852, 6.65223303]]]}
progress completed
resource-type dataset
responsible-party [{"name": "US Environmental Protection Agency, Research Triangle Park", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-138.21454852, 6.65223303], [-12.68151645, 6.65223303], [-12.68151645, 61.7110157], [-138.21454852, 61.7110157], [-138.21454852, 6.65223303]]]}
spatial_harvester true
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • 12-digit-hucs
  • alabama
  • alaska
  • amerigeo
  • amerigeoss
  • arizona
  • arkansas
  • basin
  • boundaries
  • california
  • ckan
  • colorado
  • connecticut
  • delaware
  • ecology
  • ecosystem
  • ecosystem-services
  • enviroatlas
  • environment
  • environmental-atlas
  • florida
  • geo
  • georgia
  • geoss
  • hawaii
  • huc
  • huc12
  • hydrologic-unit-code
  • hydrologic-units
  • idaho
  • illinois
  • indiana
  • iowa
  • kansas
  • kentucky
  • louisiana
  • maine
  • maryland
  • massachusetts
  • michigan
  • minnesota
  • mississippi
  • missouri
  • modeling
  • montana
  • national
  • natural-resources
  • nebraska
  • nevada
  • new-hampshire
  • new-jersey
  • new-mexico
  • new-york
  • north-america
  • north-carolina
  • north-dakota
  • ohio
  • oklahoma
  • oregon
  • pennsylvania
  • region
  • rhode-island
  • south-carolina
  • south-dakota
  • sub-basin
  • sub-region
  • subwatershed
  • surface-water
  • tennessee
  • texas
  • united-states
  • united-states-of-america
  • usa
  • utah
  • vermont
  • virginia
  • washington
  • washington-dc
  • water
  • watershed
  • watershed-boundaries
  • watershed-boundary-dataset
  • wbd
  • west-virginia
  • wisconsin
  • wyoming
isopen False
metadata_created 2025-11-21T11:55:26.477527
metadata_modified 2025-11-21T11:55:26.477531
notes This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the entire United States. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "Federal Guidelines, Requirements, and Procedures for the National Watershed Boundary Dataset; Chapter 3 of Section A, Federal Standards, Book 11, Collection and Delineation of Spatial Data; Techniques and Methods 11-A3" (04/01/2009). http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/index.html . Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level subwatersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow modification.
num_resources 5
num_tags 86
title EnviroAtlas - HU12_polygon