Data from Selected U.S. Geological Survey National Stream Water-Quality
Monitoring Networks (WQN)
USGS Digital Data Series DDS-37
By Richard B. Alexander, James R. Slack, Amy S. Ludtke, Kathleen K. Fitzgerald,
and Terry L. Schertz
Hydrologic Unit and State Geographic Information Files
Note that some of the following file extensions (i.e., ".DAT", ".FMT") are
non-standard MIME types and your browser may request additional action.
- STATES.DAT gives the correspondence
between the state codes used in the
STATIONS.DAT file and the state names.
See the STATES.FMT file for
details of the file layout.
- HUCS.TXT gives an explanation of hydrologic
units, regions, sub-regions,
accounting units, cataloging units, and hydrologic unit codes (HUC).
- HUC_NAME.TXT gives the full description
of all the hydrologic units.
- HUC_AREA.DAT gives the drainage area of
the hydrologic units by region,
subregion, accounting unit, and cataloging unit.
- SREGIONS.DAT gives the names of the
hydrologic regions and subregions.
The pathname for this page is <html/wqn/wq/geograp.htm>
Last modified: Thu Jan 16 15:46:41 EST 1997