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Biological considerations at fish passage projects in the Missoula area Pat Saffel FWP Fish Manager Missoula.

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Presentation on theme: "Biological considerations at fish passage projects in the Missoula area Pat Saffel FWP Fish Manager Missoula."— Presentation transcript:

1 Biological considerations at fish passage projects in the Missoula area Pat Saffel FWP Fish Manager Missoula

2 This Presentation sort of a “welcoming” Diverse examples of projects around Missoula – Biological considerations – Assessments One fish screen project – Complex up and downstream passage Three upstream fish passage projects – Hydro dam, low-head dam & diversion Wrap up with general themes, sneak in a video?

3 This Presentation sort of a “welcoming” Diverse examples of projects around Missoula – Biological considerations – Assessments One fish screen project – Complex up and downstream passage Three upstream fish passage projects – Hydro dam, low-head dam & diversion Wrap up with general themes, sneak in a video?

4 This Presentation sort of a “welcoming” Diverse examples of projects around Missoula – Biological considerations – Assessments One fish screen project – Complex up and downstream passage Three upstream fish passage projects – Hydro dam, low-head dam & diversion Wrap up with general themes, sneak in a video?

5 Questions with Fish Screens Is a fish in the stream better than one in the ditch? – Usually, but how much better? – Worth the cost?

6 EF Rock Creek Fish Screen Irrigation season: May – Sep Outflow: seepage cfs 200 cfs capacity $700,000 Atrophied channel 5 cfs summer flow

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8 Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners

9 Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners

10 Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners

11 Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners

12 Monitoring at EF Rock Creek Hopefully answer how much better a fish in the creek is than one in the ditch – after the fact… Trap & mark fish that are screened – How many fish are put back into the creek? Trap returning adults – How many fish screened return as adults? – Move above dam?

13 Monitoring at EF Rock Creek Hopefully answer how much better a fish in the creek is than one in the ditch – after the fact… Trap & mark fish that are screened – How many fish are put back into the creek? Trap returning adults – How many fish screened return as adults? – Move above dam?

14 Traps Upstream Downstream

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17 Questions with Upstream Passage How many fish are being impeded? Where do they want to go? – Are you passing fish to the correct location\population? – Will they survive? What kind of passage? – Volitional or selective – Passage structures

18 Questions with Upstream Passage How many fish are being impeded? Where do they want to go? – Are you passing fish to the correct location\population? – Will they survive? What kind of passage? – Volitional or selective – Passage structures

19 Questions with Upstream Passage How many fish are being impeded? Where do they want to go? – Are you passing fish to the correct location\population? – Will they survive? What kind of passage? – Volitional or selective – Passage structures

20 Milltown Dam

21 About 200,000 fish of 12 spp. blocked each year

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23 Radial Gate Blackfoot R. Clark Fork R.

24 Two Ladders?

25 Silver Lake Silver Lake System

26 DeHaan et al. 2009

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29 Biological Considerations Both creeks could be contributing bull trout to Silver Lake, with adults wanting to return What is the origin of bull trout in Silver Lake? – Prioritize passage efforts between the two creeks

30 DeHaan et al. 2009

31 Silver Lake/Storm Lake Creek Bull Trout Passage Project In 2012: Tagged/ moved 8 adults (and 13 sub-adults) At least 7 adults moved upstream Large redds found Manual passage for now - hybridization concerns with rainbow

32 West Fork Clearwater Had ~ 30 redds Emily-A Dam Migration route blocked Lake Inez Fish Barrier (aka, Emily-A Dam) Emily-A Dam

33 Many radio-tagged fish went to WF Clearwater Lake Inez Fish Barrier (aka, Emily-A Dam) Emily-A Dam

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35 Bull trout caught at dam, not in trap

36 Restoring Migration VIDEO

37 General Themes Many factors reduce numbers of fish (e.g., EF Rock Creek), understanding the biology improves a project’s chance of success (e.g., Silver Lake) The fewer life-stages and habitat problems involved the more likely to succeed (e.g., upstream passage of adults vs. downstream passage of juveniles). Passage to suitable biological and physical habitat can be very successful (e.g., Emily-A Dam). More information is needed to understand what affects a project’s effectiveness (e.g., fish screen projects).

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