Presentation on theme: "Restoration of Columbia River Floodplain Functions to Steigerwald Lake"— Presentation transcript:
1Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. AndersonRidgefield National Wildlife Refuge ComplexRidgefield, WA
2Goals of ProposalConduct a feasibility study to determine alternatives to restore connectivity, hydrology, and floodplain function to Steigerwald Lake and Gibbons Creek.Reconnect the habitats of Gibbons Creek, Steigerwald Lake, and the Columbia River to benefit native fish and wildlife populations.
3Location of Steigerwald Lake Steigerwald Lake NWRPortland
4Steigerwald Lake Hydrology Gibbons CreekLawton CreekSteigerwald Lake20 ft. NVGD840 acresColumbia River
5Changes to Steigerwald Lake WashougalSewagePlantPortSteigerwald Lake NWR
6Feasibility Study Improved Wetland Capacity/Hydrology Improved Stream Habitat:Meanders Replace ChannelizationReconnect Gibbons Creek to Steigerwald LakeLow Gradient Connectivityto Rearing/Spawning HabitatFlood Protection for Adjacent LandownersIngress/Egress of Mainstem Salmonids
7Proposal Funding for Planning and Construction USACE Section 1135 cost-share funds are available up to 75%BPA funding represents 25% cost-shareOther cost-share partners: USFWS, WDFW, WDOE
8Subbasin Habitat Priorities Bonneville Tributaries Subbasin Stock Summary and Habitat Priorities“Reconnect and preserve off-channel and side channel habitat and associated wetlands wherever they occur. Lower Gibbons Creek, Steigerwald Refuge … are priorities.”
9Subbasin Habitat Priorities Conservation of Columbia River Basin Fish Basinwide Recovery StrategyProtection and Restoration Strategy: Removal of structures below Bonneville Dam that inhibit the restoration of floodplain habitats
10Subbasin Habitat Priorities The Bonneville Tributaries Subbasin - Limiting Factors Analysis, Washington State Conservation Commission, 2000Limited amount of lower gradient habitat for spawning and rearing of salmonids present between Bonneville Dam and Portland.
11Subbasin Habitat Priorities The Columbia River Estuary and The Columbia River Basin Fish and Wildlife Program Independent Scientific Advisory BoardRemove dikes in the lower river and upper estuary to restore connections between peripheral floodplains and the river.
12Benefits of the Proposal to Salmon Current salmonid entrapment issues resolvedRemoval of barriers and reduced gradient to historic chum habitatCoho, steelhead, cutthroat smolts from Gibbons Creek have access to Stiegerwald Lake rearing habitat
13Benefits of the Proposal to Salmon Reconnection of up to 420 acres of Columbia River floodplain/rearing habitatsSmolts from the Columbia River (e.g. fall chinook) have access to LCR rearing habitats in Steigerwald Lake