This is the Glines Canyon Dam in the Olympics, soon to be removed by the National Parks Service. At 200ft high, it is clearly an impenetrable obstacle for oceangoing salmon.
Demolition of the dam will proceed with cutting successive notches in the dam face, and then finally dynamiting the base of it away. There is a massive reservoir of silt lurking at the bottom of the other side, and dealing with that will be a significant challenge to the river restoration.
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