Figure 1-4 U.S. Locks, Percent Vessels Delayed, 1993-2006

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NOTE: The percentage of all vessels delayed before passing through a lock chamber.

SOURCE: U.S. Army Corps of Engineers, Waterborne Commerce Statistics Center, Navigation Data Center, available at http://www.iwr.usace.army.mil/ndc as of April 2007.

• Vessel delays have increased dramatically since 2003.
• Age of locks is considered to be a major factor in vessel delays.