Evaluation of Directed Flow to Improve Fish Guidance for the Surface Collection Program, Cowlitz Falls Dam: Annual Report for 2000

Publication Date



Report prepared for U.S. Army Corps of Engineers, Walla Walla District.


fish guidance, guidance, watershed, salmonids, barriers, upstream, adult, juvenile, fish facility, stream habitat, habitat, collection facility, smolt, efficiency, chinook, salmon, coho, steelhead


No abstract supplied. From executive summary: Historically, the Cowlitz River watershed supported abundant runs of anadromous salmonids. However, the construction of Mayfield and Mossyrock dams created permanent barriers to upstream and downstream passage of adult and juvenile salmonids. The completion of the surface collection system and fish facility at the Cowlitz Falls Dam presented a unique opportunity to restore anadromous salmonids to 322 km for stream habitat in the upper Cowlitz River watershed. Because dams downstream of Cowlitz Falls lack juvenile collection facilities, successfully collecting migrating smolts at Cowlitz Falls Dam is the key to a successful reintroduction program. However, after four seasons of operation, fish collection efficiency (FCE) has been as low as 10% for chinook salmon smolts, but up to 80% for coho and steelhead smolts.

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