hatchery subyearling survival lower granite to mcnary dam 1998 to 2007 preliminary results
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Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2007 (preliminary results). Fish Passage Center. Overview. PIT-tagged Hatchery Subyearling Chinook passing LGR dam during two-week blocks from May 20 to July 15 each year Estimate Survival and Travel Time for blocks

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hatchery subyearling survival lower granite to mcnary dam 1998 to 2007 preliminary results

Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2007(preliminary results)

Fish Passage Center

overview
Overview
  • PIT-tagged Hatchery Subyearling Chinook passing LGR dam during two-week blocks from May 20 to July 15 each year
  • Estimate Survival and Travel Time for blocks
  • Assign average environmental variables during passage such as Flow, Spill, Temperature and Water Transit Time
  • Show bivariate plots of Reach Survival and environmental variables.
comparison of environmental conditions at lgs 1998 to 2007
Comparison of Environmental conditions at LGS 1998 to 2007

Flows in 2007 were low from late May through the end of July; similar to 2001

Spill proportion was high in 2007 but volumes were low

Temperatures were warm in 2007 similar to 2005 and 2006

water transit time
Water Transit Time
  • WTT--Avg Time for Water Particle to Transit Reservoir
  • Q -- discharge at dam
slide12

Hatchery Subyearling Chinook Survival

vs WTT and Spill Proportion

conclusions
Conclusions
  • For actively migrating subyearling Chinook, increased spill and decreased water transit time (higher flows) appear to improve survival, while higher temperatures decrease survival
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