Tribes, Corps Studying Impacts Of Sediment Buildup (Deltas) At Mouths Of Columbia River Tribs; Impacts Temps, Predation, Salmon Survival

April 14th, 2023

The amount of sediment carried by Columbia River waters to the Pacific Ocean has declined by about half since Bonneville Dam was built in 1935. Much of the sediment no longer moved by the river has found a home at the mouths of tributaries, creating shallow sediment fans or deltas where warm water and predators impact juvenile salmon and steelhead, some listed under the federal Endangered Species Act.

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Comments On Corps’ Draft EIS for 13 Willamette Valley Dams Question Whether Plan Avoids Jeopardy For ESA-Listed Salmonids

March 23rd, 2023

A massive 2,000 page draft environmental impact statement on how Willamette River Valley dams impact threatened salmon, steelhead and bull trout is flawed and does not address one of its own primary goals, which is meeting obligations under the Endangered Species Act to avoid jeopardizing the existence of listed species, according to several groups and agencies that submitted comments to the U.S. Army Corps of Engineers in late February.

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With End Of La Nina, Ocean Conditions Likely Trending Downward For Salmon, Steelhead Survival, Mass Of Warm Water In North Pacific

March 16th, 2023

Good years in the Pacific Ocean for salmon and steelhead, as the last couple of years have been, are an anomaly. Instead, ocean conditions are generally trending downward, according to a NOAA Fisheries scientist briefing the Northwest Power and Conservation Council.

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California Current Ecosystem Status Report Shows Disconnect Between Oceanographic Predictions, Observed Conditions

March 16th, 2023

Ecological relationships across the Pacific Coast that once guided annual expectations such as salmon returns are evolving as climate change disrupts long-standing connections. NOAA Fisheries researchers report these findings in their latest Ecosystem Status Report for the California Current Ecosystem.

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