Biological considerations at fish passage projects in the Missoula area
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Transcript of Biological considerations at fish passage projects in the Missoula area
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Biological considerations at fish passage projects in the Missoula area
Pat SaffelFWP Fish Manager
Missoula
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This Presentationsort 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?
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This Presentationsort 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?
![Page 4: Biological considerations at fish passage projects in the Missoula area](https://reader033.fdocuments.in/reader033/viewer/2022051700/5681602c550346895dcf3a20/html5/thumbnails/4.jpg)
This Presentationsort 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?
![Page 5: Biological considerations at fish passage projects in the Missoula area](https://reader033.fdocuments.in/reader033/viewer/2022051700/5681602c550346895dcf3a20/html5/thumbnails/5.jpg)
Questions with Fish Screens
• Is a fish in the stream better than one in the ditch?– Usually, but how much better?– Worth the cost?
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EF Rock Creek Fish Screen
Irrigation season: May – SepOutflow: seepage - 200+ cfs
200 cfs capacity$700,000
Atrophied channel5 cfs summer flow
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Biological Considerations
• Reservoir population
• Canal salvage history
• EF Rock Cr. fish populations & habitat
• Return spawners
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Biological Considerations
• Reservoir population
• Canal salvage history
• EF Rock Cr. fish populations & habitat
• Return spawners
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Biological Considerations
• Reservoir population
• Canal salvage history
• EF Rock Cr. fish populations & habitat
• Return spawners
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Biological Considerations
• Reservoir population
• Canal salvage history
• EF Rock Cr. fish populations & habitat
• Return spawners
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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?
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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?
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TrapsUpstreamDownstream
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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
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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
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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
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Milltown Dam
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About 200,000 fish of 12 spp. blocked each year
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Radial GateBlackfoot R.
Clark Fork R.
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Two Ladders?
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Silver Lake
Silver Lake System
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DeHaan et al. 2009
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DeHaan et al. 2009
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DeHaan et al. 2009
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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
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DeHaan et al. 2009
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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
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• West Fork Clearwater• Had ~ 30 redds
• Emily-A Dam• Migration route blocked
Lake Inez Fish Barrier (aka, Emily-A Dam)
Emily-A Dam
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• Many radio-tagged fish went to WF Clearwater
Lake Inez Fish Barrier (aka, Emily-A Dam)
Emily-A Dam
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Bull trout caught at dam, not in trap
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Restoring Migration
VIDEO
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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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