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U.S. Flag Vessels by Type and Age
Figures include vessels available for operation.
Totals may be greater than sum because of unclassified vessels and vessels of unknown age.
a Age is based on the year the vessel was built or rebuilt.
b In 1992, Offshore support boats were designated as crew boats.
c In 1992, Tank barges were designated as Liquid barges.
U.S. Army Corps of Engineers, Waterborne Transportation Lines of the United States, Volume 1, National Summaries (New Orleans, LA: Annual Issues), table 4, available at as of Oct. 22, 2018.