rockview diversion eliminate surface water diversion and restore side channel habitat of the methow...
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Rockview Diversion
Eliminate Surface Water Diversion and Restore Side Channel Habitat of the
Methow River
Connie Iten – Area Habitat Biologist
Washington Department
of Fish & Wildlife
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Rockview Proposal
Conversion of surface water diversion to well.Removal of screen and restoration of screen site.Removal of check dam. Development of side channel. Channel enhancement with instream structure.Plantings.Monitoring.
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Project Location
Big Valley Ranch
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Channel Conditions in the Upper Methow Sub-watershed
Area below the Weeman bridge is a gaining reach.Spring chinook spawning in the upper Methow sub-watershed would benefit from additional off channel habitat.
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Biological Objectives:
Restore floodplain complexity.Protect and enhance riparian habitat.Increase instream and riparian habitat diversity to provide cover, breeding and feeding areas for fish and wildlife.
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Lack of Side Channel HabitatIdentified as limiting to salmonids in the Methow Watershed.
Methow Limiting Factors Report – WCC 2000Priority Considerations for Protection & Restoration of Salmonid Habitat in the Upper Columbia Region – UCRTT 2001Sub-basin Summary – CBFWA 2001
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Need for ProjectLoss of available side channel habitat.Exisiting conditions are limiting and potentially harmful to listed species.Supplementation and recovery efforts create demand for increased carrying capacity of available off-channel habitat.
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Increased survival to outmigration is aided by adequately functioning, available rearing and over-wintering habitat.
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Removal of Screen and Restoration of Screen Site
Eliminate conveyance loss and provide more water to the side channel.
Eliminate the potential for stranding fish.
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Removal of Check Dam
Allow natural flows through the channel.
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Develop Side Channel
Provide adequate gradient for flows.Assure connection with the mainstem Methow river.
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Channel Enhancement
Establish functioning channel geomorphology.Provide habitat diversity.Provide adequate velocities for flows to maintain channel condition.
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Plantings
Provide shade, structure, and nutrient sources to the channel.Provide thermal cover, breeding and feeding areas for wildlife.
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MonitoringDetermine pre-project use by fish & wildlife.Assess fish & wildlife use of restored channel and riparian area.Evaluate changes in water quality, channel morphology and habitat diversity.
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Feasibility
Complements other projects in the upper Methow watershed.Previously functioning channel.Channel is used by salmonids.
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Benefits:
Increase in available side channel habitat.Increased floodplain complexity.Protection and enhancement of riparian habitat.