Bureau of Transportation Statistics (BTS)
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Figure 1-3 U.S. Lock Usage by Type, 1993-2006

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Figure 1-3 U.S. Lock Usage by Type, 1993 to 2006. If you are a user with disability and cannot view this image, please call 800-853-1351.

NOTE: * "Other lockages" and "other" vessels are too close to the x axis to be seen.

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.
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