Posts Tagged ‘dams


The view of the river…

has changed over the years. Abandoned Native American (Wasco’s) village near The Dalles Oregon..The Dalles Dam in the background on the Columbia River. Washington State across the river.

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Smolts & the Dams (How Do They Die? How Could They Be Saved?)

“Observers thought that what was killing salmon in hydroelectric dams was the blunt trauma of striking the turbine blades, or maybe concrete. But the Sensor Fish and its armory of sensors discovered that the culprit was an abrupt change in pressure as a smolt falls past the blades.

The pressure drop sometimes causes a fish to “burp” from its internal air bladder so by the time it reaches the tailrace (the bottom pool of the dam) it is negatively buoyant. In other words, it sinks like a stone. In order to restore its internal equilibrium, the smolt immediately surfaces to gulp some air. And at the surface an enemy awaits.

Birds of prey have figured out that the tailrace of a dam is an all-you-can-eat salmon buffet. They swoop down on the traumatized, beleaguered fish and add to salmon mortality.” More


McKenzie River (Oregon) Environmental Assessment of Flows

McKenzie River (Oregon)

This is an interesting study on the McKenzie River drainage, a significant tributary of the Willamette River. The report is informative re data collected, comparisons made and how it could be applied to other rivers by the Department of Interior. The Nature Conservancy was also involved in the study.

Key Elements

• This report presents the results of a study that is part of the Nature Conservancy Sustainable Rivers Project begun in 2002 in partnership with U.S. Army Corps of Engineers.

• The study objective was the creation of an environmental flow framework for the McKenzie River basin, Oregon, necessary to sustain aquatic and terrestrial ecosystems.

• The goal of this report is to provide a hydrologic, geomorphic, and ecological baseline assessment for basin stakeholders.

The McKenzie River Study

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August 2020

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