|Vessel types||Age group (years)|
|< = 5||610||1115||1620||2125||> 25|
NOTES: Total includes a small number of boats whose ages are unknown. Data includes vessels available for operation. Age is based on the year the vessel was built or rebuilt, using calendar year 2008 as the base year. Dry cargo includes dry bulk, containership, general cargo, and specialized cargo. Dry barges includes dry cargo barges that may be open or covered, lash/seabee, or deck. Tank barges include single and double hull barges.
SOURCE: 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 http://www.ndc.iwr.usace.army.mil/publications.htm as of July 7, 2010.