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  2. The 10-digit HUCs divide the larger sub-region into watersheds, and the 12-digit HUCs divide the watersheds into sub-watersheds.
    www.in.gov/idem/nps/what-is-a-watershed/hydrolo…
    HUC 8 maps the subbasin level, analogous to medium-sized river basins (about 2200 nationwide, pictured in red in the image); and HUC 12 is a more local sub-watershed level that captures tributary systems (about 90,000 nationwide used by EnviroAtlas to display national metrics for the conterminous U.S.).
    enviroatlas.epa.gov/enviroatlas/datafactsheets/pdf/…
    Watersheds are delineated by USGS using a nationwide system based on surface hydrologic features. This system divides the country into 22 regions (2-digit), 245 subregions (4-digit), 405 basins (6-digit), ~2,400 subbasins (8-digit), ~19,000 watersheds (10-digit), and ~105,000 subwatersheds (12-digit).
    nas.er.usgs.gov/hucs.aspx
    WBDs are represented as polygons that define the boundary of the HUs. The HUs are given a Hydrologic Unit Code (HUC) that ranges from 2 digits to 12 digits. These codes describe where the unit is in the country and the level of the unit.
    developers.google.com/earth-engine/datasets/catal…
     
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  4. Hydrologic Unit Maps | U.S. Geological Survey - USGS.gov

  5. Science in Your Watershed: Locate Your Watershed …

    Find your watershed by using the 8-digit Hydrologic Unit Code (HUC) on a map of the United States. Learn more about the USGS Water Science in Your Watershed program and the new Watershed Finder Menu Interface.

  6. Hydrologic Unit Codes: What Are They? - ArcGIS …

    Learn how hydrologic unit codes (HUCs) identify drainage basins in the United States in a nested arrangement of six levels. Explore the map and the interactive features to see the HUCs for each region, subregion, basin, subbasin, …

  7. Watershed Boundary Dataset | U.S. Geological …

    The Watershed Boundary Dataset (WBD) is a seamless, national hydrologic unit dataset that defines the drainage area of surface water to an outlet point. The WBD contains eight levels of progressive hydrologic units identified by unique …

  8. Hydrologic unit system (United States) - Wikipedia

  9. Nonindigenous Aquatic Species

    Each hydrologic unit is assigned a 2-digit to 12-digit number that uniquely identifies each of the six levels of classification within six two-digit fields. An example is shown below using hydrologic unit code 180902030303:

  10. USGS Water Resources: About USGS Water Resources

  11. What is a Hydrologic Unit Code (HUC)? - SDSU …

    Mar 22, 2022 · HUC is a system of land area classification based on surface hydrologic features. Learn about the levels, digits, and names of HUC, and how they differ from 8-digit to 12-digit units.

  12. EnviroAtlas Interactive Map | US EPA

    Sep 3, 2024 · HUC Navigation | Identify upstream or downstream 12-digit HUCs within the stream network from any given point in the conterminous US. Elevation Profile | View the elevation profile of a selected line segment.

  13. Science in Your Watershed: Locate Your Stream Site by 12-Digit …

  14. IDEM: Nonpoint Source: Hydrologic Unit Codes: What Are They

  15. Surface Water Quality and Hydrologic Units (HUCs) - Ohio

  16. Hydrologic Units - 12 digit (Subwatersheds) - ArcGIS

  17. Science in Your Watershed - Find Watershed Information - USGS

  18. HUC12: USGS Watershed Boundary Dataset of Subwatersheds

  19. How to Find Your River Mile Watershed Code

  20. Hydrologic Unit Codes - HUC's - Idaho State University

  21. Science in Your Watershed - USGS

  22. Endangered and Threatened Wildlife and Plants; Removing …