Elwha sediment from dam removal monitored

PORT ANGELES — The U. S. Geological Survey says removing the two dams on the Elwha River is exposing 24 million cubic yards of sediment deposited in the reservoirs.

The agency said that’s enough sediment to fill the Seattle Seahawks’ CenturyLink Field eight times.

In a report published Tuesday the USGS said one-third to one-half of the sediment is expected to flow downstream in the next three to six years. In the year since the dam removal project started less than 1 percent of the sediment has eroded.

Scientists said the sediment will likely build the river bar and slow coastal erosion near the mouth of the river on the Strait of Juan de Fuca.

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