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Imnaha River Smolt Survival and Smolt to Adult Return Rate Quantification (Imnaha River Smolt Monitoring Program) BPA Project Number 199701501 Nez Perce.

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Presentation on theme: "Imnaha River Smolt Survival and Smolt to Adult Return Rate Quantification (Imnaha River Smolt Monitoring Program) BPA Project Number 199701501 Nez Perce."— Presentation transcript:

1 Imnaha River Smolt Survival and Smolt to Adult Return Rate Quantification (Imnaha River Smolt Monitoring Program) BPA Project Number Nez Perce Tribe Department of Fisheries Resources Management Authors: Jay A. Hesse, Peter J. Cleary, Michael L. Blenden, and Paul A. Kucera

2 Associated Projects Fish Passage Center Smolt Monitor Program by non-federal Entities –In-season (real time) flow (spill) management –Hydrosystem configuration effectiveness/impact assessment –Long-term (time series) trend monitoring (status) Lower Snake River Compensation Plan Evaluation Studies –Hatchery Performance and Effectiveness

3 Project Background Smolt Emigration Studies began in 1993 at Cow Cr. (rkm 7) with funds from the Lower Snake River Compensation Plan (LSRCP). Participation in the Fish Passage Centers Smolt Monitoring Program began in 1994 as part of BPA Project < Project funding was obtained directly from BPA in 1998 < Major study design changes were proposed, but not funded, in 2002 for year round monitoring and obtaining smolt-to-adult returns for natural chinook salmon

4 Current Goals < Imnaha Smolt Monitoring - Provide emigration information to the Fish Passage Center while maintaining a time series of steelhead survival and arrival data to Lower Granite Dam, Lower Monumental Dam, and McNary Dam.

5 Funded Objectives Describe emigration timing from the Imnaha River Monitor Imnaha River fish arrival timing and travel times to and through the mainstem Snake and Columbia rivers Estimate survival natural and hatchery fish from the Imnaha River subbasin to and through the mainstem Snake and Columbia rivers Provide information to the Fish Passage Center, Lower Snake River Compensation Plan Program, Northeast Oregon Hatchery Monitoring and Evaluation Program (NEOH M&E), and PTAGIS

6 Located 7 km from the confluence of the Snake River Below all but one major tributary Situated on private property Study Area Imnaha River Juvenile Fish Trap

7

8 Approach Juvenile Chinook Salmon and Steelhead Emigrant Trapping (March 1 – June 15) PIT Tag Chinook Salmon and Steelhead –Weekly release groups of –Season-wide sample size of 11,000 chinook salmon and 5,000 steelhead –Passage route control (SbyC) PIT Tag Interrogations of Smolts and Adults at Mainstem Dams and the Imnaha River

9 PIT Tagging Goals

10 Logistical Limitations

11 Smolt Emigration Timing Natural Chinook Natural Steelhead Hatchery Chinook Hatchery Steelhead

12 Juvenile Hatchery Chinook Salmon Emigration Timing Imnaha River

13 Size at Emigration 2003 Imnaha River Steelhead

14 Size at Emigration 2003 Imnaha River Chinook Salmon

15 Imnaha River Natural Juvenile Chinook Salmon Arrival Timing at Lower Granite Dam

16 90% Arrival Timing of Steelhead at Lower Granite Dam (1994 to 2003)

17 90% Arrival Timing of Chinook Salmon at Lower Granite Dam (1992 to 2003)

18 Weekly Survival of Hatchery Steelhead from the Imnaha River to Lower Granite and Lower Monumental Dams in 2003

19 Season-wide Juvenile Steelhead Survival Estimates to Lower Granite Dam Imnaha River

20 Season-Wide Juvenile Survival Estimates to McNary Dam Natural and Hatchery Steelhead 1998 to 2003

21 Post Release Survival Hatchery Chinook Salmon (Gumboot Acclimation Facility to Mouth of Imnaha River)

22 Season-wide Juvenile Chinook Salmon Survival Estimates to Lower Granite Dam Imnaha River

23 Season-Wide Juvenile Survival Estimates to McNary Dam Natural and Hatchery Chinook Salmon 1998 to 2003

24 Summary Tributary-specific contribution to Fish Passage Center Smolt Monitor Program basin aggregate monitoring. Maintains a time series of tributary-specific juvenile survival estimates to and through the Snake and Columbia river hydrosystem. –Natural chinook salmon survival to Lower Granite Dam range from 76 to 91%. –Hatchery chinook salmon survival to Lower Granite Dam range from 67 to 80%. –Natural steelhead survival to Lower Granite Dam range from 82 to 90%. –Hatchery Steelhead survival to Lower Granite Dam range from 64 to 89 %. Primary data and survival estimates available real time on line at and Annual reports posted at

25 Future Direction

26 Questions?


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