Tracking Sediments’ Fate In Largest-Ever Dam Removal

Elwha river estuary. Photograph: © SAF — Coastal Care


Salmon are beginning to swim up the Elwha River for the first time in more than a century. But University of Washington marine geologists are watching what’s beginning to flow downstream, sediments from the largest dam-removal project ever undertaken.

The 108-foot Elwha Dam was built in 1910, and after decades of debate it was finally dismantled last year. Roughly a third of the 210-foot Glines Canyon Dam still stands, holding back a mountain of silt, sand and gravel…

Read Full Article, University Of Washington

Largest US Dam Removal Releases Huge Amount Of Sediment, Yale Environment 360
Scientists tracking the aftermath of the largest dam removal in U.S. history say the dismantling of a dam in northwestern Washington state has unleashed about 34 million cubic yards of sediment and debris that built up for more than a century.

Sediment Starts to Really Hit The Elwha, The Seattle Times
Long expected, the heavy loads of sediment created by demolition of Glines Canyon Dam and Elwha Dam are starting to hit the Elwha river.

On The Elwha, A New Life When The Dam Breaks, The Smithsonian
Nobody figured the largest dam removal project ever attempted in the U.S. was going to be easy, or fast.The nation’s largest and most ambitious dam removal will begin this month, when workers start demolishing two antique dams on Washington state’s Elwha River…

Elwha, The Grand Experiment
Stanford University’s School of Humanities and Sciences, and their Knight Risser Prize for Western Journalism, has honored Lynda Mapes of the Seattle Times with a Special Citation for the report, “Elwha: The Grand Experiment”, which focusses on the largest dam removal project in the world currently underway in Washington State.