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Seasonally Adjusted Transportation Data
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Source:
Tonnage carried on internal U.S. waterways - U.S. Army Corps of Engineers, Waterborne Commerce Statistics Center, Internal U.S. Waterway Monthly Tonnage Indicators available at http://www.navigationdatacenter.us/wcsc/wcmthind.htm
Seasonally-adjusted tonnage carried on internal U.S. waterways - U.S. Department of Transportation, Bureau of Transportation Statistics (BTS) calculation from U.S. Army Corps of Engineers, Waterborne Commerce Statistics Center, Internal U.S. Waterway Monthly Tonnage Indicators available at http://www.navigationdatacenter.us/wcsc/wcmthind.htm