1 Map data are shipments by
weight in tons. Waterborne shipments include foreign imports and exports but
exclude intrastate shipments.
NOTE: This map is based on
information from Waterborne Commerce of the United States data.
SOURCE: U.S.
Department of Transportation, Research and Innovative Technology
Administration, Bureau of Transportation Statistics, based on data from U.S.
Army Corp of Engineers, Waterborne Commerce
Statistics Center, CY 2002 Waterborne Tonnage by State, available at
http://www.iwr.usace.army.mil/, as of April 2005.