Content-Description:
USGS Hydrologic Units Maps
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Water Resources |
Hydrologic Unit Maps
What are Hydrologic Units?
Adapted from Seaber, P.R., Kapinos, F.P., and Knapp, G.L., 1987,
Hydrologic Unit Maps:
U.S. Geological Survey Water-Supply Paper 2294, 63 p.
Updated information not from this source is enclosed in square brackets.
A copy of USGS Water-Supply Paper 2294 may be ordered from
USGS Information Services
The United States is divided and sub-divided into successively
smaller hydrologic units which are classified into four levels:
regions, sub-regions, accounting units, and cataloging units. The
hydrologic units are arranged within each other, from the smallest
(cataloging units) to the largest (regions). Each hydrologic unit
is identified by a unique hydrologic unit code (HUC) consisting of
two to eight digits based on the four levels of classification in
the hydrologic unit system.
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[Figure 1. Map of Water Resources Regions]
Click for a larger (13K) image.
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The first level of classification divides the Nation into 21
major geographic area, or regions. These geographic areas
contain either the drainage area of a major river, such as the
Missouri region, or the combined drainage areas of a series of
rivers, such as the Texas-Gulf region, which includes a number
of rivers draining into the Gulf of Mexico. Eighteen of the
regions occupy the land areaof the conterminous United States.
Alaska is region 19, the Hawaii Islands constitute region 20,
and Puerto Rico and other outlying Caribbean areas are region 21.
[The regions are shown in figure 1.]
The second level of classification divides the 21 regions into
222 subregions. A subregion includes the area drained by a river system, a
reach of a river and its tributaries in that reach, a closed basin(s), or a
group of streams forming a coastal drainage area.
The third level of classification subdivides many of the subregions into
accounting units. These 352 hydrologic accounting units nest within, or are
equivalent to, the subregions.
The fourth level of classification is the cataloging unit, the smallest
element in the hierarchy of hydrologic units. [Efforts are underway
to add further levels of subdivisions.]
A cataloging unit is a geographic area
representing part of all of a surface drainage basin, a combination of
drainage basins, or a distinct hydrologic feature. These units subdivide
the subregions and accounting units into smaller areas There are 2150
Cataloging Units in the Nation. [Cataloging Units sometimes are called
"watersheds." See, for example, the
EPA Surf Your Watershed site.]
List of Hydrologic Units
Access, by region, the text-formatted list
of hydrologic units names and numbers from USGS Water-Supply Paper 2294.
You also may download the National file to your computer in either the
original format or in
tab-delimited format.
Paper Maps
Paper maps include a hydrologic unit map of the United States, and
hydrologic unit maps for each State. They delineate the hydrographic
boundaries of major river basins and show numeric codes assigned to
each river basin. The maps were prepared in a cooperative project
between the USGS and the U.S. Water Resources Council, which was
initiated in 1972. State maps are published at a scale of 1:500,000. A
hydrologic unit map of the U.S. (unfortunately, out of print) is at a
scale of 1:2,500,500.
Paper maps may be ordered from
USGS Information Services
Digital Spatial Data Sets
View of huc2m coverage.
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1:2,000,000-scale Hydrologic Units (huc2m)
This is a sophisticated coverage with extensive documentation.
Attribute tables show hydrologic
unit names and flow direction among cataloging units.
The coastline of the U.S. is included and land/water polygons
are distinguished.
Unofficial offshore extensions of cataloging units are shown.
The coverage was developed for
work on the National Water Summary.
The coverage is available on line, at no charge, via links from the
metadata file.
It may be retrieved as a single file for the entire U.S., or by Water Resources Region.
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1:250,000-scale Hydrologic Units (huc250k)
The data for this large coverage was originally collected
for the Geographic Information Retrieval and Analysis System (GIRAS)
at a scale of 1:250K. Some areas,
notably major cities in the west, were recompiled at a scale of 1:100K.
The coverage was compiled to provide the National Water Quality Assessment
(NAWQA) study units with an intermediate- scale river basin boundary for extracting other
GIS data layers.
The coverage is available on line, at no charge, via links from the
metadata file.
It may be retrieved as a single file for the entire U.S., or by Water Resources Region.
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U.S. Department of the Interior, U.S. Geological Survey
Maintainer: Water Webserver Team
Last update: 12:54:2 Wed 4Feb98
URL: http://water.usgs.gov/public/GIS/huc.html
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