News | Northwest Power and Conservation Council

Corps of Engineers Report: Steller Sea Lions Are Taking A Big Bite Out Of Fish Runs At Bonneville Dam

March 12, 2021
John Harrison

The number of California sea lions is declining, but the number of Stellers remains high. Monitoring now occurs in all seasons except summer.

Sea Lion Reports: Stellers Are Staying Longer At Bonneville And Feasting On Winter Steelhead

May 05, 2020
John Harrison

Big sea lions are causing big problems for Columbia River salmon and steelhead, according to the U.S. Army Corps of Engineers' annual report on sea lion predation at Bonneville Dam.

More Sea Lions, Fewer Fish

June 09, 2017
John Harrison

More sea lions and fewer spring Chinook salmon at Bonneville Dam this year was not good news for the fish.

Sea Lion Fish Feast

March 01, 2017
John Harrison

The number of salmon and steelhead consumed by sea lions at Bonneville Dam last year, more than 9,500 fish, was the second-largest since observations and monitoring began in 2002, according to a report by the U.S. Army Corps of Engineers. During their annual spring foray into the Columbia River, sea lions also killed lamprey and sturgeon.

Sea Lions Feast on Salmon and Steelhead at Bonneville Dam

May 19, 2016
John Harrison

Fish kills peak in the first week of May, then decline. More than 50 of the most aggressive hunters have been permanently removed.

Spring Chinook Crowd the Fish Ladders at Bonneville Dam

April 30, 2015
John Harrison

An avalanche of spring Chinook hit Bonneville Dam in late April and early May, then tapered off into the middle of the month. Bonneville, 146 miles inland from the Pacific Ocean, is the first place on the Columbia River where

California Sea Lions at Bonneville Dam Aren't the Problem

March 22, 2012
Carol Winkel

There's a common perception that the National Oceanic and Atmospheric Administration's decision to allow Oregon, Washington, and Idaho to kill California sea lions at Bonneville Dam addresses the fish predation problem there. But right now, most of the damage is

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Corps of Engineers Report: Steller Sea Lions Are Taking A Big Bite Out Of Fish Runs At Bonneville Dam

Sea Lion Reports: Stellers Are Staying Longer At Bonneville And Feasting On Winter Steelhead

More Sea Lions, Fewer Fish

Sea Lion Fish Feast

Sea Lions Feast on Salmon and Steelhead at Bonneville Dam

Spring Chinook Crowd the Fish Ladders at Bonneville Dam

California Sea Lions at Bonneville Dam Aren't the Problem

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