FILE - This Friday, March 28, 2008 picture shows the site of the Milltown Dam in Milltown, Mont. After a hundred years, the Blackfoot and Clark Fork Rivers are now able to flow freely without being blocked. The federal government has hauled away millions of tons of toxic sediment and removed a reservoir as part of a Superfund site cleanup in southwestern Montana's fishing country, only to encounter a hitch - the changes may impede a threatened species of trout. (AP Photo/James Snook)

After a hundred years the Blackfoot and Clark Fork Rivers are now able to flow freely without being blocked by the Milltown Dam on Friday, March 28, 2008, in Milltown Mont. The two rivers now flow where the Milltown Dam powerhouse once stood. (AP Photo/James Snook)

 James Snook / The Associated Press
 

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    Section:/national/health-science