Table 3,,,,,,,
"Age of the U.S.-Flag Vessels: As of December 31, 19991",,,,,,,
,Age (percentage of total for each vessel type)2,,,,,,
Vessel type,Number,# 5,6–10,11–15,16–20,21–25,> 25
Vessels (total)3,"41,766",19.1,9.4,4.2,24.3,18,24.6
Self-propelled (total),"8,379",9.1,5.4,6,23.5,17.4,38.4
  Dry cargo,695,8.6,7.1,14,21,14.2,35
  Tanker,142,8.5,2.1,8.5,24.6,21.1,35.2
  Towboat,"5,098",5.9,2.7,2.9,21.6,18.7,48
  Passenger4,970,14.8,15.1,18.9,12.4,9.8,29.1
  Offshore supply,"1,470",16.7,7.8,4.1,38.8,19.3,13
Barge (total),"33,387",21.6,10.5,3.8,24.4,18.2,21.1
  Dry covered,"13,477",27.4,6.7,0.8,33.7,19.2,12.2
  Dry open,"9,146",22.5,17.5,7.6,22.2,15,15.1
  Lash/SEABEE5,"1,796",0,16,6.2,2,43.9,31.9
  Deck,"4,842",17.9,8.2,6.3,16,11,38
  Other dry cargo6,153,7.2,5.2,7.2,24.2,11.1,37.3
  Single hull tank,685,3.5,1.9,1.9,19.3,11.4,61.9
  Double hull tank,"2,621",16.6,10.4,0.8,19,21.6,31.7
  Other tank7,667,16,1.8,0.9,16.9,17.2,45.9
"1 Survey date as of December 31, 1998; includes updates through December 2000.",,,,,,,
"2 Age (in years) is based on the year the vessel was built or rebuilt, using calendar year 1999 as the base year.",,,,,,,
3 Total is greater than the sum because of 4 unclassified vessels and 168 of unknown age; figures include vessels available for operation.,,,,,,,
4 Includes passenger and excursion/sightseeing.,,,,,,,
5 Lighter aboard ship (barge rides on a mother ship).,,,,,,,
"6 Includes dry cargo barges that may be open or covered, railcar, pontoon, roll-on/roll-off, container, or convertible.",,,,,,,
"7 Includes tank barges that may be double-sided only, double-bottom only, or not elsewhere classified.",,,,,,,

"SOURCE: U.S. Army Corps of Engineers, Navigation Data Center, U.S. Waterway System Facts, available at http://www.wrsc.usace.army.mil/ndc/wcsc.htm.",,,,,,,