Gulf of Mexico
Watershed

0/^EXlCO^

Mississippi River Drainage
Gulf Drainage, Non Mississippi
Non Gulf Drainage

~

State Boundaries
/ Hydrologic Unit Regions
Hydrologic Unit Subregions
Streams

Data Sources:

USGS Hydrologic Unit Map
Original Scale 1:250,000
USGS Gcip Data
Digital Chart of the World
Reach File 1

U.S. Navy ET0P05 5x5 Minute
Balhymelric and Topographic
Data Base
Bathymetric contours 50 meter interval
Index contours every 500 meters.

0 75 150 225 300 375 450 525

0 75 150 225 300

Environmental Protection Agency
Region 6 GIS
Water Quality Division
Dallas, Tx

4

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