Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield...
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![Page 1: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/1.jpg)
Restoration of Columbia River Floodplain Functions to
Steigerwald Lake
Eric D. AndersonRidgefield National Wildlife Refuge Complex
Ridgefield, WA
![Page 2: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/2.jpg)
Goals of Proposal
• Conduct 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.
![Page 3: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/3.jpg)
Location of Steigerwald Lake
Portland
Steigerwald Lake NWR
![Page 4: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/4.jpg)
Steigerwald Lake Hydrology
Steigerwald Lake20 ft. NVGD840 acres
Columbia River
Gibbons Creek
Lawton Creek
![Page 5: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/5.jpg)
Changes to Steigerwald Lake
WashougalS
ewag
e P
lant
Port
Steigerwald Lake NWR
![Page 6: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/6.jpg)
Feasibility Study
Low Gradient Connectivityto Rearing/Spawning Habitat
Improved Stream Habitat:Meanders Replace Channelization
Flood Protection for Adjacent Landowners
Ingress/Egress of Mainstem Salmonids
Reconnect Gibbons Creek to Steigerwald Lake
Improved Wetland Capacity/Hydrology
![Page 7: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/7.jpg)
Proposal Funding for Planning and Construction
• USACE Section 1135 cost-share funds are available up to 75%
• BPA funding represents 25% cost-share
• Other cost-share partners: USFWS, WDFW, WDOE
USACE1135BPA
OtherPartners
![Page 8: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/8.jpg)
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.”
![Page 9: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/9.jpg)
Subbasin Habitat Priorities
Conservation of Columbia River Basin Fish Basinwide Recovery Strategy
• Protection and Restoration Strategy: Removal of structures below Bonneville Dam that inhibit the restoration of floodplain habitats
![Page 10: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/10.jpg)
Subbasin Habitat Priorities
The Bonneville Tributaries Subbasin - Limiting Factors Analysis, Washington State Conservation Commission, 2000
• Limited amount of lower gradient habitat for spawning and rearing of salmonids present between Bonneville Dam and Portland.
![Page 11: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/11.jpg)
Subbasin Habitat Priorities
The Columbia River Estuary and The Columbia River Basin Fish and Wildlife
Program Independent Scientific Advisory Board
• Remove dikes in the lower river and upper estuary to restore connections between peripheral floodplains and the river.
![Page 12: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/12.jpg)
Benefits of the Proposal to Salmon
• Removal of barriers and reduced gradient to historic chum habitat• Current salmonid entrapment issues resolved• Coho, steelhead, cutthroat smolts from Gibbons Creek have access to Stiegerwald Lake rearing habitat
![Page 13: Restoration of Columbia River Floodplain Functions to Steigerwald Lake Eric D. Anderson Ridgefield National Wildlife Refuge Complex Ridgefield, WA.](https://reader035.fdocuments.us/reader035/viewer/2022070305/5514ea6a550346a80c8b4a83/html5/thumbnails/13.jpg)
Benefits of the Proposal to Salmon
• Smolts from the Columbia River (e.g. fall chinook) have access to LCR rearing habitats in Steigerwald Lake
• Reconnection of up to 420 acres of Columbia River floodplain/rearing habitats