The elimination of the Elwha dams was the biggest dam elimination venture in U.S. historical past. Greater than 20 million tons of sediment have been launched–a few decade’s price of accumulation–considerably altering the river channel and floodplain. Woody particles that had been held behind the dams was dispersed alongside the river’s size downstream of the previous reservoirs.
Now, salmon are once more spawning in pristine river habitats of the Olympic Nationwide Park, and sediment is once more flowing down the river and to the eroding shoreline. The river continues to vary a decade after the final dam was eliminated.
Take a look at this 10-year retrospective from the USGS.