Biological considerations at fish passage projects in the Missoula area Pat Saffel FWP Fish Manager Missoula
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?
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?
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?
Questions with Fish Screens Is a fish in the stream better than one in the ditch? – Usually, but how much better? – Worth the cost?
EF Rock Creek Fish Screen Irrigation season: May – Sep Outflow: seepage cfs 200 cfs capacity $700,000 Atrophied channel 5 cfs summer flow
Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners
Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners
Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners
Biological Considerations Reservoir population Canal salvage history EF Rock Cr. fish populations & habitat Return spawners
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?
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?
Traps Upstream Downstream
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
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
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
Milltown Dam
About 200,000 fish of 12 spp. blocked each year
Radial Gate Blackfoot R. Clark Fork R.
Two Ladders?
Silver Lake Silver Lake System
DeHaan et al. 2009
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
DeHaan et al. 2009
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
West Fork Clearwater Had ~ 30 redds Emily-A Dam Migration route blocked Lake Inez Fish Barrier (aka, Emily-A Dam) Emily-A Dam
Many radio-tagged fish went to WF Clearwater Lake Inez Fish Barrier (aka, Emily-A Dam) Emily-A Dam
Bull trout caught at dam, not in trap
Restoring Migration VIDEO
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).