Safe Passage

by Lance Helwig, P.E., Struct. Engr.; U.S. Army Corps of Engrs., Portland District, Portland, OR,
Greg Katzenberger, P.E., Struct. Engr.; INCA Engrs., Bellevue, WA,
David Stensby, P.E., Struct. Engr.; INCA Engrs., Bellevue, WA,

Serial Information: Civil Engineering—ASCE, 1999, Vol. 69, Issue 11, Pg. 62-65

Document Type: Feature article


Past studies have indicated that the existing juvenile fish bypass system at the second powerhouse located at the Corps of Engineers' Bonneville Dam on the Columbia River in Washington is deficient from a biological standpoint. In an effort to reduce injury, stress, and even some deaths of juvenile fish passing through the system a new juvenile bypass system is being constructed along the Washington State shoreline. The major features of the improvements include modifications to the existing downstream migrant channel within the powerhouse and construction of a 3.2 km long below-grade transportation flume, a monitoring facility, and two outfall structures along the Washington shore.

Subject Headings: Power plants | Fish and fishery management | Existing buildings | Shores | Shoreline protection | Rivers and streams | Offshore construction

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