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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)
slide3

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%)
slide5

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%

slide6

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
slide8

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%)
slide12

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%

slide13

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%)
slide15

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.
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