2008
DOI: 10.1007/s10750-008-9411-3
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Mitigating the effects of high-head dams on the Columbia River, USA: experience from the trenches

Abstract: Worldwide, humans have tremendously altered freshwater ecosystems and arguably, construction of dams has had the greatest effect. Maintaining natural ecological processes and developing mitigation strategies that will maintain species while retaining dam benefits is challenging. In the Columbia River, USA, over the last 30 years more than US$7 billion has been spent on efforts to save historically large runs of salmon. These efforts have included improving passage conditions at dams through construction of eff… Show more

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Cited by 62 publications
(57 citation statements)
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References 46 publications
(38 reference statements)
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“…The listing had major economic consequences for the fi shing industry and for the operators of the dams, who have spilled water to accommodate salmon migration, resulting in lost potential revenue ever since. Over the past several decades, improvements in fi sh passage at the dams and the implementation of a fi sh transportation program to bypass the impounded section of the river basin have improved the survival of seaward migrating juveniles (smolts) (Muir et al 2001 ), but adult return rates have not substantially improved (Williams 2008 ;Schaller et al 2007 ).…”
Section: Chinook S Almon Backgroundmentioning
confidence: 99%
“…The listing had major economic consequences for the fi shing industry and for the operators of the dams, who have spilled water to accommodate salmon migration, resulting in lost potential revenue ever since. Over the past several decades, improvements in fi sh passage at the dams and the implementation of a fi sh transportation program to bypass the impounded section of the river basin have improved the survival of seaward migrating juveniles (smolts) (Muir et al 2001 ), but adult return rates have not substantially improved (Williams 2008 ;Schaller et al 2007 ).…”
Section: Chinook S Almon Backgroundmentioning
confidence: 99%
“…Such influences might include altered migration timing due to slowed passage around dams (e.g. Raymond 1979Raymond , 1988, altered river flows and temperatures from water management (Zabel & Williams 2002, Williams 2008, Petrosky & Schaller 2010, or changes to hatchery release strategies (Rechisky et al 2012). Another management activity that directly affects salmon ocean arrival timing is barging (e.g.…”
Section: Introductionmentioning
confidence: 99%
“…Increased development of tributary streams, however, could have an equally substantial ecological impact if fish are not considered during design, construction and operation of new infrastructure projects. 25 …”
Section: Development In the Lower Mekong River Basinmentioning
confidence: 99%
“…25 However, the North American perspective also illustrates how difficult and costly it can be to mitigate fish passage impacts once infrastructure is built. In the Columbia river alone, more than US$7 billion has been spent (since 1950) on efforts to save iconic salmonid species 25 by constructing fishways, stock enhancement, screening irrigation diversions, habitat rehabilitation, and providing downstream passage. Whilst this has helped save salmonids from extinction, there still is a strong reliance on hatchery production throughout the entire catchment.…”
Section: Applying Biological Knowledge To Future Infrastructure Prmentioning
confidence: 99%
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