Natural origin spring/summer chinook salmon adult returns to the Snake River basin are declining at a rate of 19 percent each year and 77 percent of Snake River spring/summer chinook populations will fall below a quasi-extinction risk threshold of 50 fish for each distinct population by 2025 without emergency actions, Nez Perce tribal fisheries biologists warned this week.
Republican U.S. House members from eastern Washington and eastern Oregon are accusing Idaho Republican Rep. Mike Simpson of “in-depth coordination” with Oregon Gov. Kate Brown “behind the scenes” to “shepard” through Congress his proposal to breach the Lower Snake river dams to increase returns of salmon and steelhead to the Snake River basin.
Idaho Fish and Game released more than 1 million endangered Snake River sockeye salmon smolts from its Sawtooth Hatchery directly into the Upper Salmon River April 30 rather than transporting and then releasing the smolts into Redfish Lake Creek, which is normally the last stop for the smolts as they begin their downstream migration to the ocean.
Negotiating a transboundary water treaty is a complicated undertaking. There are many different, often competing, factors to consider. As Canada, British Columbia, and the Columbia Basin Indigenous Nations collaborate on positions and options for a modernized Columbia River Treaty with the United States, a new computerized model aims to help the parties understand just how these factors are interconnected.
The bypass systems at Columbia/Snake dams for juvenile salmon and steelhead are mostly attracting the smaller fish, which return as adults in lower numbers than larger fish. Is it the size of the fish impacting survival, or “delayed mortality” from dam passage?
With juvenile chinook and sockeye salmon, as well as juvenile steelhead, beginning their migration from the mid-Columbia River tributaries and hatcheries, but with very low water in the river due to a late spring runoff, salmon managers this week asked for augmentation flows originating from Grand Coulee Dam’s Lake Roosevelt.
The U.S. Army Corps of Engineers, Portland District is anticipating an insufficient water year as it refills its 13 Willamette Valley and two Rogue River Basin reservoirs for the upcoming recreation season.
After a week of increasing outflows at Idaho’s Dworshak Dam to support releases of juvenile salmon from Clearwater River hatcheries, the U.S. Army Corps of Engineers announced last Friday (April 16) that it will now begin to decrease those flows so that it can be assured of refilling the dam’s reservoir.
Eight years of spawning surveys in White Salmon River tributaries is showing the progression of how naturally-returning steelhead are repopulating the river after removal of Condit Dam in 2011.