Presentation on theme: "Restoration of Columbia River Floodplain Functions to Steigerwald Lake"— Presentation transcript:
1 Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. AndersonRidgefield National Wildlife Refuge ComplexRidgefield, WA
2 Goals 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.
3 Location of Steigerwald Lake Steigerwald Lake NWRPortland
4 Steigerwald Lake Hydrology Gibbons CreekLawton CreekSteigerwald Lake20 ft. NVGD840 acresColumbia River
5 Changes to Steigerwald Lake WashougalSewagePlantPortSteigerwald Lake NWR
6 Feasibility 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
7 Proposal 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
8 Subbasin 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.”
9 Subbasin 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
10 Subbasin 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.
11 Subbasin 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.
12 Benefits 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
13 Benefits 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