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2005 Preliminary Summer Spill Data. Fall Chinook Radiotelemetry Studies Performed by USGS – BRD, NOAA – NWFSC For the USACE Anadromous Fish Evaluation Program. Important Considerations. These estimates do not address transport vs. in-river survival nor adult return issues

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2005 preliminary summer spill data

2005 Preliminary Summer Spill Data

Fall Chinook Radiotelemetry Studies Performed by

USGS – BRD, NOAA – NWFSC

For the USACE

Anadromous Fish Evaluation Program


Important considerations
Important Considerations

  • These estimates do not address transport vs. in-river survival nor adult return issues

  • This information is very preliminary and the specific numbers are likely to change

  • This is the first look at subyearling passage at most of these projects including RSW’s

  • These survival estimates are relative survival estimates compared to a tailrace reference (except at Little Goose)


2005 preliminary summer spill data

Legend

Survival Metrics

Passage Metrics

% of fish

passing a dam

via a specific

route

% of fish

surviving a dam

or specific

dam passage

route

Passage Route

% of fish

surviving RSW

passage

route

% of Fish

Passing

a dam via

an RSW


Lower granite background information
Lower GraniteBackground Information

  • Study

    • Radio Telemetry – Paired Release (2200 fish released)

    • June 20 – July 22

  • Operations

    • RSW on Total Avg Q = 41kcfs

    • RSW on Spill Avg Q = 18.5kcfs (46.7%)

    • RSW off Total Q = 43.4kcfs

    • RSW off Spill Avg Q = 30.5kcfs (69.6%)


  • 2005 preliminary summer spill data

    Lower Granite Dam

    Spill

    Passage

    94%

    Turbine

    Passage

    2%

    Bypass

    Passage

    4%

    Dam

    Survival

    89.5%

    Bypass not included

    Summer Non-RSW Operations

    Spill

    Survival

    90.2%


    2005 preliminary summer spill data

    Lower Granite Dam

    Spill

    Passage

    86.5%

    Training

    18.5%

    Turbine

    Passage

    2.5%

    RSW

    68%

    RSW

    Survival

    94.5%

    Bypass

    Passage

    11%

    Dam

    Survival

    93.9%

    Bypass not included

    Summer RSW Operations


    Little goose background information
    Little GooseBackground Information

    • Study

      • Radio Telemetry – Single Release

      • Used the ~2000 fish released at LGR

      • June 21 – July 28

  • Operations

    • Total Avg Q = 39.6kcfs

    • Spill Avg Q = 17.9kcfs (44%)*

      • Spill changed during the study due to adult passage issues

        • Spill limited to 30% daytime


  • 2005 preliminary summer spill data

    Little Goose Dam

    Spill

    Passage

    84%

    Turbine

    Passage

    3%

    Bypass

    Passage

    13%

    Dam

    Survival

    91.6%

    Bypass not included

    Summer Non-RSW Operations

    Spill

    Survival

    92%


    Lower monumental background information
    Lower MonumentalBackground Information

    • Study

      • Radio Telemetry and PIT – Paired Release

      • Approximately 2200 fish released

      • *July 6 – July 16

  • Operations

    • Total Avg Q = 36kcfs

    • Spill Avg Q = 21kcfs (59%)


  • Lower monumental dam

    Spillway

    Passage

    88%

    Turbine

    Passage

    2%

    Bypass

    Passage

    8%

    Dam

    + Forebay

    Survival

    72.2%

    Dam

    Survival

    86.2%

    Lower Monumental Dam *

    Summer Non-RSW Operations

    Spill

    Survival

    90.5%


    Ice harbor background information
    Ice HarborBackground Information

    • Study

      • Radio Telemetry and PIT – Paired Release

      • Approximately 4200 fish released

      • June 10 – July 1

  • Operations

    • RSW on Total Avg Q = 50kcfs

    • RSW on Spill Avg Q = 23kcfs (46%)

    • RSW off Total Avg Q = 49kcfs

    • RSW off Spill Avg Q = 41kcfs (84%)


  • 2005 preliminary summer spill data

    Ice Harbor Dam

    Spillway

    Passage

    98%

    Turbine

    Passage

    1%

    Bypass

    Passage

    1%

    Dam

    + Forebay

    Survival

    95.1%

    Dam

    Survival

    99.6%

    Summer Non-RSW Operations

    Spill

    Survival

    99.8%


    2005 preliminary summer spill data

    Ice Harbor Dam

    Spill

    Passage

    87%

    Turbine

    Passage

    5%

    Bypass

    Passage

    8%

    Training

    27%

    RSW

    60%

    Dam

    + Forebay

    Survival

    92.9%

    Training

    Survival

    95.9%

    RSW

    Survival

    99.4%

    Spill

    Survival

    98.3%

    Dam

    Survival

    98.0%

    Summer RSW Operations


    Mcnary background information
    McNaryBackground Information

    • Study

      • Radio Telemetry - Paired Release

      • Approximately 2700 fish released

      • June 22 – July 31

  • Operations

    • Total Avg Q = 171kcfs

    • Spill Avg Q = 104kcfs (60%)


  • 2005 preliminary summer spill data

    McNary Dam

    Spill

    Passage

    64%

    Spill

    Survival

    102%

    Turbine

    Passage

    19%

    Turbine

    Survival

    86%

    Bypass

    Survival

    86%

    Bypass

    Passage

    17%

    Summer RSW Operations

    Dam

    Survival

    96.3%


    Key overall takeaways from r t studies
    Key Overall Takeaways from R/T Studies

    • The results suggest generally high subyearling survival through the projects

    • Fish Passage Efficiency (FPE, the percent of fish passing via non-turbine routes) at all projects was relatively high ranging from 81 to 100%.


    Key takeaways cont
    Key takeaways (cont.)

    • Spill Effectiveness (percent of fish passing through the spillway divided by the percent of water passing through the spillway) was higher than we anticipated for Snake River Projects and was 2-3 times higher for RSW’s than spillways.

    • Dam passage with RSW had higher survival at LGR and Lower at Ice Harbor yet neither were likely statistically significant.