Spill Test Set To Begin On Columbia, Snake; Could Validate Benefits For Outmigrating Smolts

Federal, state and tribal officials have agreed to a three-year trial to see if increasing spill down the Columbia and Snake Rivers can “significantly boost” outmigrating salmon and steelhead smolt numbers.


It’s already believed to, but the deal will allow for more flexible spring operations at eight dams to test the idea beginning next year through 2021, according to a report in the Lewiston Tribune.

“Collaboration is key to this new approach to Columbia River system management. Working together, the region’s states, tribes, and federal agencies have developed an approach that demonstrates environmental stewardship and affordable sustainable energy are not mutually exclusive,” reads a joint statement from “key supporters” of the agreement.

The parties include the Nez Perce Tribe, Oregon, Washington, BPA, Army Corps and Bureau of Reclamation. The states of Idaho and Montana are also on board with it.

The trial will include the four Lower Snake dams in Washington and the four on the shared Columbia between Washington and Oregon.

Both states will need to “harmonize” how they measure total dissolved gas measured below the spillways, with Washington’s Department of Ecology needing to up its allowance by early April and consider boosting it to 125 percent for tests in 2020.

A 2017 report by the Fish Passage Center says that “increasing spill for fish passage within the safe limits of 125% total dissolved gas has a high probability of improving smolt to adult return rates.”

The more fish, the more for fishermen of all fleets to catch and orcas to eat as well as escaping to spawn in the wild.

“It’s incremental progress at time when Columbia River spring Chinook are projected to return at very low numbers,” said spill advocate Liz Hamilton at the Northwest Sportfishing Industry Association, who added that it was “hardly the bold action we were seeking in (Governor Jay Inslee’s) Orca task force prey work group.”

She said NSIA will be watching closely, especially as dissolved gas levels are ramped up to the 125 percent benchmark.

“It can’t happen soon enough,” she said.

But concerns have been raised that spilling water will reduce electrical generation capacity in the hydropower system, and according to outdoor reporter Eric Barker’s piece in the Tribune, this week’s agreement was panned by Rep. Cathy McMorris Rodgers, who also introduced a bill in the House this year against it.

In early 2018, U.S. District Court Judge Michael Simon, who has been overseeing a long-running case over Columbia salmon and dam management, had ordered spill to occur.


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