A two-year project to move trainloads of accumulated toxic mud from a dam and haul it 90 miles for disposal is set to begin soon. The work is a major step toward the 2008 removal of the century-old Milltown Dam on the Clark Fork River near Missoula. Arsenic and copper are among the contaminants in the mud tainted as historic mining in the Butte area sent pollution 120 miles down the Clark Fork, to its confluence with the Blackfoot River at Milltown. Benefits of removing the mud and the dam include pollution control and enhanced fish passage, the U.S. Environmental Protection Agency has said.

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