NOTE: A lockage is the transfer of a vessel(s), or that part of the
tow that can be contained in the lock chamber, through a chamber in a single
direction.
SOURCE: U.S. Army Corps of
Engineers, Waterborne Commerce Statistics Center, Navigation Data Center,
available at www.iwr.usace.army.mil/ndc as of April 2007.
The number of lockages has remained basically fl at over the past several
years.
The number of vessels traversing the locks has declined since the peak in
the late 1990s.
Barges (loaded and empty) remain the major vessel type traveling on the
U.S. inland waterways.
