Almost 60 percent of the U.S. domestic waterborne trade tonnage is moved on the inland waterways. This market consists of carriers that transport freight between U.S. ports. At least 80 percent of the tonnage in this trade is carried by barge.
NOTE: Please see A Time Series Analysis of U.S. Inland Waterways Trade, page 116, for a detailed analysis of the underlying trend.
|Inland Waterways Commercial Tonnage||May-01||May-02|
|All commodities (million short tons)||47.7||47.4|
|All commodities percent change from same month previous year||-10.84||-0.63|
NOTE: The current value is compared to the value from the same period in the previous year to account for seasonality.
A trendline has been provided for Inland waterways commercial tonnage. The trend has been calculated through a statistical procedure called Structural Modeling, in which the time series under study is decomposed into seasonal, trend and irregular components. For further information on this statistical procedure, see: S.J. Koopman, et al., Structural Time Series Analyser, Modeller and Predictor (STAMP), London: Timberlake Consultants Ltd. , 2000
SOURCE: U.S. Army Corps of Engineers, Waterborne Commerce Statistics Center, Monthly Indicators, June 2002, available at: http://www.iwr.usace.army.mil/ndc/wcsc.htm.