_At the Milltown Reservoir Superfund site, the river was diverted into a bypass channel two days ago, the last step before the Clark Fork and Blackfoot rivers are released Friday from their century-long confinement behind Milltown Dam.
It will be the first time since 1908 that the rivers have flowed freely, a milestone in the $120 million cleanup, restoration and redevelopment of Milltown Reservoir. . . .
The breaching - which could take anywhere from a few minutes to an hour - will drop the reservoir level 14 feet and unleash 300,000 tons of sediment scoured from the mouth of the Blackfoot River, which is relatively free of toxic wastes.