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WRIA 8 Salmon Habitat Project List: Lake Union/Ship Canal

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WRIA 8 Salmon Habitat Project List: Lake Union/Ship Canal WRIA 8 Salmon Habitat Project List: Thursday, July 13, 2017 Lake Union/Ship Canal APPLICABLE STRATEGIES LEGEND: Protect and restore Protect and Protect and Protect and restore marine water and restore restore cold water forest cover and sediment quality, floodplain sources and reduce headwater areas connectivity thermal barriers to especially near migration commercial and industrial areas Protect and Improve juvenile Provide adequate Improve water restore functional and adult survival stream flow quality riparian at the Ballard Locks vegetation Integrate salmon Restore sediment Protect and Reduce predation recovery priorities into processes necessary restore channel on juvenile local and regional for key life stages complexity migrants and lake- planning, regulations, rearing fry and permitting (SMP, CAO, NPDES, etc.) Restore shallow Remove (or Restore natural Continue existing and water rearing reduce impacts of) marine shoreline conduct new research, and refuge overwater monitoring, and adaptive habitat structures management on key issues Reconnect and Remove fish Reconnect Increase awareness enhance creek passage barriers backshore areas and and support for mouths pocket estuaries salmon recovery Page 1 of 8 Opportunities, Constraints, and Description Applicable Strategies Ballard Bridge Shoreline Restoration other Considerations Potential habitat restoration/public access area under the Ballard Bridge along the north side of Project the canal. The potential exists to connect the SC-1 project with private green space just to the west of Number site, and the Seattle Central Community College Four-Year Marine Technology Center's landscaped shoreline Project Location Work Plan? to the east. Incorporate treatment of rainwater No run-off from the Ballard Bridge and riparian Seattle vegetation. Estimated Project Costs Acquisition Restoration Total Opportunities, Constraints, and Description Applicable Strategies Ballard Bridge Water Quality Improvements other Considerations Improve water quality by treating runoff with vegetated bioswales. Project SC-2 Number Four-Year Project Location Work Plan? No Seattle Estimated Project Costs Acquisition Restoration Total Page 2 of 8 Opportunities, Constraints, and Description Applicable Strategies Fremont Bridge Demonstration Project other Considerations Work with U.S. Army Corps of Engineers to construct a demonstration project on federal lands Project West of the Fremont Bridge, where there is an SC-3 area available for bank re-sloping, addition of Number native vegetation, and rock removal. Four-Year Hypothetically, this would provide a refuge site for Project Location Work Plan? migrating juveniles. No Seattle Estimated Project Costs Acquisition Restoration Total Opportunities, Constraints, and Description Applicable Strategies Aurora Avenue Bridge Shoreline Restoration other Considerations Remove riprap and restore vegetation under the Aurora Avenue bridge on the north side near Project Adobe property. SC-4 Number Four-Year Project Location Work Plan? No Seattle Estimated Project Costs Acquisition Restoration Total Page 3 of 8 Opportunities, Constraints, and Description Applicable Strategies Bank Softening and Revegetation at other Considerations Gasworks Park Large area for potential shoreline restoration Seattle needs additional approvals including removal of shoreline armoring, invasive from Ecology on sediment cleanup Project vegetation removal, and revegetation. Project before they can proceed. East SC-5 should also evaluate DNR Waterway 20 for shoreline will be enhanced with Number potential enhancement (just west of Gasworks). invasive vegetation removal and Four-Year revegetation. Need investigation to Project Location Work Plan? determine what can be done along No the west portion. Best case is some Seattle implementation begins in 2021-22. Estimated Project Costs Acquisition Restoration Total Opportunities, Constraints, and Description Applicable Strategies Evaluate Deepening the Montlake Cut other Considerations Evaluate options for deepening the Montlake Cut Need to coordinate this to determine if this is a feasible way to allow investigation with the Army Corps Project colder water from Lake Washington to flow in Lake of Engineers. SC-6 Union. Number Four-Year Project Location Work Plan? No Seattle Estimated Project Costs Acquisition Restoration Total Page 4 of 8 Opportunities, Constraints, and Description Applicable Strategies Reduce Large Lock Speed other Considerations Further reduce lockage speed for large locks to Corps of Engineers should inform reduce smolt entrainment in filling culverts. whether this remains a viable Project alternative to address juvenile SC-7 survival. Number Four-Year Project Location Work Plan? No Ballard Locks Estimated Project Costs Acquisition Restoration Total Opportunities, Constraints, and Description Applicable Strategies Fish Ladder Improvements other Considerations Improve downstream entrance to the fish ladder Corps of Engineers should inform with a telescoping weir and a horizontal gate. whether this remains a viable Project Close the slot on the downstream end to alternative to address fish passage. SC-8 concentrate the flow. Number Four-Year Project Location Work Plan? No Ballard Locks Estimated Project Costs Acquisition Restoration Total Page 5 of 8 Opportunities, Constraints, and Description Applicable Strategies Add Fishway Lighting to the Fish Ladder other Considerations Corps of Engineers should inform whether this remains a viable Project alternative to address fish passage. SC-9 Number Four-Year Project Location Work Plan? No Ballard Locks Estimated Project Costs Acquisition Restoration Total Opportunities, Constraints, and Description Applicable Strategies Implement Operational Improvements to the other Considerations Locks Operational improvements include replacing filling Updated project description in 2015 culvert valves and machinery (Stoney Gate valves), to align this project with current Project installing a PIT tag reader in large lock filling improvements being implemented SC-10 culvert, rehabilitating the large lock gate, finding a or targeted by Corps. A PIT tag Number permanent solution to the saltwater drain intake reader was installed in the large Four-Year and diffuser well, and redesigning the smolt flume. lock filling culverts in 2017, as was a Project Location Work Plan? prototype for a new smolt slide. Yes Ballard Locks Estimated Project Costs Acquisition Restoration Total Page 6 of 8 Opportunities, Constraints, and Description Applicable Strategies Locks Natural Fishway and Estuary other Considerations Construct a more natural, fairly wide and long channel at the Locks facility that would allow both Project adult and juvenile fish to move back and forth SC-11 between warmer lake outflow and cooler tidal Number water, and allow tidal change to inundate areas Four-Year designed into the channel where both adults and Project Location Work Plan? juveniles could find refuge to hold and choose No their preferred salinity. Ballard Locks Estimated Project Costs Acquisition Restoration Total Opportunities, Constraints, and Description Applicable Strategies Improve Estuary Conditions Upstream of the other Considerations Locks Modify the salt water barrier or change operation A false lockage study was of the barrier while increasing the number of large conducted in 2015 and found Project lockages to introduce cool marine waters above minimal upstream benefits while SC-12 the locks and create a longer estuary environment. posing some other water quality Number issues. Other options may be Four-Year available. Project Location Work Plan? Yes Ballard Locks Estimated Project Costs Acquisition Restoration Total Page 7 of 8 Opportunities, Constraints, and Description Applicable Strategies Explore Low Elevation Smolt Passage at Locks other Considerations Consider structural options for smolt passage when use of smolt flumes drops off. Large locks Project may be serving this purpose. SC-13 Number Four-Year Project Location Work Plan? No Ballard Locks Estimated Project Costs Acquisition Restoration Total Page 8 of 8.
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