Rapid changes seen as dam falls on Elwa River

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PORT ANGELES, Wash. — The final chunks of concrete are expected to fall this September in the nation’s largest dam removal project, but nature is already reclaiming the Elwha River on Washington’s Olympic Peninsula.

So much sediment, once trapped in reservoirs behind two hydroelectric dams, has flowed downstream that it has dramatically reshaped the river’s mouth, replenished eroding beaches and created new habitat for marine creatures not observed there in years.

Meanwhile, Chinook salmon and steelhead have been streaming into stretches of the Elwha River and its tributaries previously blocked by the Elwha Dam, which stood for nearly a century before it came down in 2012.

Demolition crews this month are waiting for river flows to drop, so they can begin removing the remaining 30-feet of Glines Canyon Dam.

Comments

GeneandCassie 8 months, 3 weeks ago

It is interesting to ponder the Elwha sediment releases and then to ponder sediment related topics of interest on the Snake River:

http://earthfix.opb.org/water/article/us-army-corp-of-engineers-plans-sediment-removal-w/

In one situation the plumes of released sediment are not a concern but in the other its a major issue......

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namvet60 8 months, 3 weeks ago

Very good links to this event. One might say that a lack of communication between entities is a foregone conclusion. To leave the Snake river out of Lewiston in the hands of environmentalist is insane. The environmentalist want to go by truck and rail with exception of transporting oil. What one wonders is what propels these big rigs down the road?

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GeneandCassie 8 months, 3 weeks ago

It is interesting to first ponder the Elwha sediment releases and then to ponder sediment related topics of interest on the Snake River:

http://earthfix.opb.org/water/article/us-army-corp-of-engineers-plans-sediment-removal-w/

In one situation the plumes of released sediment are not a concern but in the other its a major issue; involving a much smaller amount of sediment......

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