Wisconsin Department of Natural Resources - Hydrologic Units - 8 digit (Subbasins)

Description:

The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal extent of surface water drainage to a point except in coastal or lake front areas where there could be multiple outlets as stated by the "Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)" “Standard” (https://pubs.er.usgs.gov/publication/tm11A34). Watershed boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. This dataset represents the hydrologic unit boundaries to the 8-digit level for all HUs coded as being entirely or partially contained in Wisconsin.At a minimum, the HUs are delineated at 1:24,000-scale in the conterminous United States, meeting the National Map Accuracy Standards (NMAS). Higher resolution boundaries are being developed where partners and data exist and will be incorporated back into the WBD. WBD data are delivered as a dataset of polygons and corresponding lines that define the boundary of the polygon. WBD polygon attributes include hydrologic unit codes (HUC), size (in the form of acres and square kilometers), name, downstream hydrologic unit code, type of watershed, non-contributing areas, and flow modifications. The HUC describes where the unit is in the country and the level of the unit. WBD line attributes contain the highest level of hydrologic unit for each boundary, line source information and flow modifications. Staff in the WI DNR GIS Section downloaded the National WBD from the USGS National Map Staged Products Directory on April 13th, 2023: https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/WBD/National/GDB/. The USGS National WBD metadata indicates a Publication Date of 03-28-2023. WI DNR staff extracted all HUs entirely or partially contained in Wisconsin, using information in the WBD "STATES" attribute. The data were then projected to the Wisconsin Transverse Mercator coordinate referencing system (WKID 3071). This feature class includes a subset of the original WBD attribute data. For information about the complete set of available WBD attributes, refer to the NATIONAL_WBD_GDB.xml metadata file on the USGS National Map Staged Products Directory. *Versions of the HUC8s after 2020 do not include islands in the great lakes. The USGS WBD team in collaboration with other state, federal and international partners reviewed how the WBD was delineated in the Great Lake region in support of NHDPlus HR production and decided that each lake would be broken out as its own 8-digit HU and that all islands within the lake would be included in that lake's HU8 instead of being broken out into their own HU8s. This dataset was automatically cataloged from the creator's Open Data Portal. In some cases, publication year and bounding coordinates shown here may be incorrect. Additional download formats may be available on the author's website. Please check the 'More details at' link for additional information.

Resource Link:

https://data-wi-dnr.opendata.arcgis.com/datasets/wi-dnr::hydrologic-units-8-digit-subbasins

Identifier:

https://www.arcgis.com/home/item.html?id=6be95ea9107e4e2e89e372c0a13522e2&sublayer=0

Language:

English

Creator:

Wisconsin Department of Natural Resources

Provider:

American Geographical Society Library – UWM Libraries

Resource Class:

Datasets

Resource Type:

Digital maps

Temporal Coverage:

Issued 2021

Date Issued:

2021-07-13

Spatial Coverage:

Wisconsin and United States

Rights:

Although this data is being distributed by the American Geographical Society Library at the University of Wisconsin-Milwaukee Libraries, no warranty expressed or implied is made by the University as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the University in the use of this data, or related materials.

Access Rights:

Public

Format:

Shapefile