Figure 1-1 - Number of Lockages and Vessels, 1993-2006

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Figure 1-1 - Number of Lockages and Vessels.  If you are a user with disability and cannot view this image, please call 800-853-1351.

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 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.