Contrasts emerge at Glines Canyon Dam

In-water demolition pauses at Glines Canyon Dam. / Photo courtesy of Tom Roorda

The delta and shoreline above Glines Canyon Dam provide a stunning contrast to the surrounding forest in this photo take yesterday by Tom Roorda.

Work in the Elwha River stopped Aug. 1 for the “fish window,” which will halt all in-water work until Sept. 15. During this time, steps are being taken to reduce flows of sediment, which can harm migrating salmon. Salmon are being trapped downstream for transport into clearer waters above the dams.

As you can see, the reservoir level has come down at Glines as more of the delta is exposed and the river seeks multiple routes on its downstream course.

Tom Roorda, owner of Northwestern Territories, has taken aerial photos of the Elwha and Glines Canyon dams and their sediment plumes since the beginning of dam removal. Check out his website, Roorda Aerial, which contains a slideshow of some interesting and beautiful aerial photos.

As we have discussed, the lower Elwha Dam has been removed and the river is flowing at historical levels. Massive amounts of sediment are moving downstream and into the Strait of Juan de Fuca. The finer sediments that have reached the Strait so far tend to disperse rather than accumulate.

During the fish window, work crews at Glines are preparing to demolish the intake tower, which is no longer in the river. A blast at the base will drop the tower onto its side, allowing a jackhammer attached to an excavator to break up the concrete.

In July, six controlled blasts lowered Glines Canyon Dam by 24 feet to the current elevation of 490 feet. About 90 feet of the original 210-foot-tall dam remain, according to the “Dam Removal Blog,” written Olympic National Park staff.

The two final blasts on July 29 and 31 notched the dam the final six feet to elevation 490 feet. Videos of three of the blasts can be viewed below in these explosive shots provided by URS:

July 15 blast at Glines Canyon Dam

July 29 blast at Glines Canyon Dam

July 31 blast at Glines Canyon Dam

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