Passage behavior and survival for river-run subyearling chinook salmon at Ice Harbor Dam, 2004

Details

• Personal Author:
  Ice Harbor Lock and Dam (Wash.) ; Snake River (Wyo.-Wash.)
• Corporate Authors:
  Ogden, Darren A. ; Hockersmith, Eric E. ; Eppard, M. Brad ; Axel, Gordon A. ; Sandford, Benjamin P.
• Conference Authors:
  Northwest Fisheries Science Center (U.S.). Fish Ecology Division. ; United States. Army. Corps of Engineers. Walla Walla District.
• NOAA Program & Office:
  NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)
• Description:
  Recent studies to evaluate spillway-passage at Ice Harbor Dam have resulted in lower-than-expected survival estimates. It was hypothesized, based on research from 2003, that increasing the volume of water spilled through individual bays would increase survival for fish passing that route. To increase the volume of water through individual spillbays, fewer bays were opened to spill total amounts equivalent to spill volumes mandated by the 2000 National Marine Fisheries Service biological opinion for nighttime spill (100% of river flow or to total dissolved gas limits). This pattern was termed “bulk” spill. To test this hypothesis, in 2004, Ice Harbor Dam was operated in a 4-day block study design where the spillway was operated under a bulk spill pattern for 2 d followed by 2 d of a “flat” spill pattern (daytime spill of 45 kefs through all 10 bays).
• Keywords:
  Passage behavior and survival for river-run subyearling chinook salmon at Ice Harbor Dam, 2004
• Format:
  PDF
• Document Type:
  Non-series Report
• Funding:
  Contract no. W68SBV92844866
• Name as Subject:
  Recent studies to evaluate spillway-passage at Ice Harbor Dam have resulted in lower-than-expected survival estimates. It was hypothesized, based on research from 2003, that increasing the volume of water spilled through individual bays would increase survival for fish passing that route. To increase the volume of water through individual spillbays, fewer bays were opened to spill total amounts equivalent to spill volumes mandated by the 2000 National Marine Fisheries Service biological opinion for nighttime spill (100% of river flow or to total dissolved gas limits). This pattern was termed “bulk” spill. To test this hypothesis, in 2004, Ice Harbor Dam was operated in a 4-day block study design where the spillway was operated under a bulk spill pattern for 2 d followed by 2 d of a “flat” spill pattern (daytime spill of 45 kefs through all 10 bays).
• License:
  https://creativecommons.org/publicdomain/zero/1.0/
• Rights Information:
  CC0 Public Domain
• Compliance:
  Library
• Main Document Checksum:
  urn:sha256:cf240baa0678306949846447c2190f3faf84363c707afb6414777a355e01bbd1
• Download URL:
  https://repository.library.noaa.gov/view/noaa/50178/noaa_50178_DS1.pdf
• File Type:
  [PDF - 12.59 MB ]