• Olympic: Three Parks in One

    Olympic

    National Park Washington

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  • Olympic Hot Springs Road Closed

    The Elwha Valley's Olympic Hot Springs Road is closed to public entry beyond the Altair Campground during removal of the Glines Canyon Dam. Olympic Hot Springs is not accessible from the Elwha.

Removal of the Glines Canyon Dam

Looking upstream at Glines Canyon dam

A view of Glines Canyon dam from downstream

Scott Church

Dam Removal Strategy:

The removal of the Glines Canyon dam will proceed through a series of steps.

  • First, water will be diverted through the penstock to lower Lake Mills Reservoir up to 80 feet. This will allow for work to occur at Elwha dam with some level of flood protection provided by the Lake Mills drawdown.
  • Once that preliminary work is accomplished at Elwha dam, removal of the upper portion of Glines Canyon dam can occur. At this point, water is flowing over the newly lowered dam crest. The dam will then be notched on alternating sides to create temporary spillways that can be used to further drain the reservoirs.
  • Layers of the dam can then be removed as the reservoir is drained through each new notch. This will be done on alternating sides of the dam until the sediments from the upstream delta have eroded downstream and are resting against the dam.
  • At this point, the remaining portion of the dam will be blasted and the river channel restored.

 
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This webpage was made possible in part by a grant from Washington’s National Park Fund.

Did You Know?

star-shaped purple flowers growing in a crack of a rock

That the Piper's bellflower is unique to the Olympic Mountains? Named after an early Olympic peninsula botanist, the Piper's bellflower grows in cracks and crevices of high elevation rock outcrops.