An Undammed River’s Sediment Brings New Life Downstream

Anne Shaffer sits on the sandy shoreline of the Elwha River and looks around in amazement. Just two years ago, this area would have been under about 20 feet of water.

So far about 3 million cubic yards of sediment — enough to fill about 300,000 dump trucks — has been released from the giant bathtubs of sediment that formed behind the two hydroelectric dams upstream. And that’s only 16 percent of what’s expected to be delivered downstream in the next five years.

All of that sediment is already reshaping the mouth of the Elwha, which empties into the Strait of Juan de Fuca on the northern shore of Washington's Olympic Peninsula.

The depth at the mouth of the river has changed by about 50 feet. Long, charcoal-colored sandy beaches have formed where there once only smooth, platter-sized cobblestones.

Watch video report:
http://kuow.org/post/undammed-river-s-sediment-brings-new-life-downstream