U.S. hopes dams' demolition will let salmon return

They were known as June Hogs -- 100-pound salmon that, when stood on end, were taller than a man.

Up until a century ago, they returned annually to the Elwha River on Washington state's in runs so huge homesteaders reported the river turned into a wiggling mass from bank to bank. One count placed their number at 392,000.

Then, two dams were built across the river, and the spawning grounds were blocked, giving the fish less than five miles of river to breed. Today fewer than 3,000 fish return to the Elwha.

That's about to change.

In what would be the largest removal project ever in the United States, the federal government last week requested bids to demolish the two structures -- the 105-foot Elwha Dam, finished in 1913, and the Glines Canyon Dam, twice as tall as the Elwha Dam, finished in 1927.

The dams won't be blown up, but dismantled over roughly three years so the 19 million cubic yards of silt, gravel and rock behind them can be flushed downstream gradually.

The project will cost more than $300 million. The cost of removing the dams -- $60 million to $70 million -- is only a portion of the price tag.

Once the dams are down, it may take 10 years to re-establish the runs, but officials are determined the fish will return. Some will be flown by helicopter to the upper reaches of the Elwha watershed. To supplement the meager number of , others will be raised in a nearby hatchery and added to the runs. Eventually, the runs are expected to become wild.

Scientists say if the salmon runs can't be restored on the Elwha, they can't be restored anywhere.

More than 85 percent of the river's salmon habitat is in the Olympic National Park, remote backcountry even now barely touched by man.

"I have no doubt this will work," said Brian Winter, the Elwha Project manager for the National Park Service.

Winter, a fisheries biologist who has been working on restoring the Elwha runs since 1985, said the river is a living laboratory that has been studied for decades.

"This isn't so much about taking out the dams, it's about seeing the first salmon headed up stream," he said.

Others are calling it the "last dam summer" as demolition work is expected to begin next year.

"All eyes, including internationally, are on it to see how a river comes back to life," said Amy Kober of American Rivers. "The lessons we learn on the Elwha will apply to others around the nation."

To the Lower Elwha Klallam Tribe, the removal of the dams is about more than salmon. When the dams were built, the reservoirs that grew behind them flooded the tribe's only inland village and the "tribal creation site," where according to legend the tribe was created.

"We just have word of mouth about where they are," said Robert Elofson, the tribe's director of Elwha River restoration. "It's been 100 years."

The dam removal project began in 1992 when Congress approved the Elwha River Restoration Act.

The privately owned dams provided electricity that helped power the economy of the Olympic Peninsula, including the Bremerton Naval Shipyard and nearby paper mills.

There were several attempts to strip funding over the years, but they failed. Former U.S. Sen. Slade Gorton, R-Wash., unsuccessfully sought to link the Elwha project to a promise that four dams on the lower Snake River would never be breached to aid salmon runs in the Columbia River basin.

Before seeking bids to remove the dams, the Interior Department, which includes the Service, spent $24.5 million on a water treatment plant for the city of Port Angeles and $69.6 million for other water facilities. Port Angeles takes it water from the Elwha and there were concerns the silt released by the removal of the dams could affect water quality.

The Interior Department also paid $16.4 million to construct a new tribal fish hatchery. Work is also underway on some levy modifications.

Congress has been providing roughly $20 million in funding annually and nearly $55 million in economic stimulus money was also appropriated.

Rep. Norm Dicks, D-Wash., whose congressional district includes the Elwha, has championed the project from the beginning.

"There's no question we can do this," Dicks said of restoring the runs.

Dicks is an avid fisherman. In his congressional office is a mounted 54-pound salmon he caught in Alaska. He laughs when asked about catching a 100-pound .

No one is betting those giants will return to the Elwha.

But to those who have been working on the restoration project for 18 or more years, the end may be in sight.

"It's amazing we are so close," said Kober.

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Citation: U.S. hopes dams' demolition will let salmon return (2010, April 12) retrieved 22 January 2022 from https://phys.org/news/2010-04-demolition-salmon.html
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