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Assistant Secretary average barge industry barge rates barge shipments Btu's bulk CAPACITY AT KEY cents a gallon coal commodities Congress Considered in Setting Department of Transportation detrimental diversion of traffic diversion to rail draft report dredging efficient transportation environment environmental impact Environmentalists estimated factors Federal freight fuel efficiency fuel tax GAO note horsepower Illinois River improvements increase in barge increased traffic inland waterways inland waterways system Interstate Commerce Commission key lock l0 percent l0-percent increase modes of transportation movement navigation user charges O&M costs Ohio Rivers operation and maintenance petroleum pipelines recreational result Setting Future Policy shippers and carriers ton-mile tonnage towboat traffic diversion traffic from waterways traffic volume transportation modes U.S. Army U.S. General Accounting upper Mississippi River Water Resources Council water transportation waterborne waterway traffic waterways carriers waterways industry waterways segments waterways shipments waterways user charges