|Vessel types||Age group (years)|
|< 6||6-10||11-15||16-20||21-25||> 25|
NOTES: Data includes vessels available for operation. Age is based on the year vessels were built or rebuilt. Passenger includes passenger excursion/sightseeing, combination passenger and dry-cargo vessels, and ferries.
SOURCE: U.S. Army Corps of Engineers, Waterborne Transportation Lines of the United States, Volume 1, National Summaries (New Orleans, LA: annual issues).