U.S.-flag Great Lakes freighters carried 10.4 million tons of dry bulk cargo in August, 3.7 percent more than in August 2010.
Iron ore volume was 4.8 million tons, up 8 percent; limestone was 2.9 million tons, up almost 21 percent; and coal was 2.2 million tons, down 7.5 percent.
Through the end of August, laker volume stands at 55.1 million tons, a 3.2 percent increase compared to the same point in 2010.
Laker cargo up nearly 4% in August
