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