Water Control Structure - Modification/Removal
Steigerwald Floodplain Restoration Project
The Steigerwald Floodplain Restoration Project is a collaborative project that will reconfigure the Port of Camas-Washougal’s existing Columbia River levee system to reduce flood risk, reconnect 960 acres of Columbia River floodplain, and increase recreation opportunities at the Steigerwald Lake National Wildlife Refuge.
Restore hydrology and juvenile access to approximately 160 acres of off-channel habitat and floodplain lakes. Additional restoration actions may include up to 60 additional acres of off-channel improvements. Phase 1 restoration: Ruby Lake, Phase 2 restoration: Millionaire/Deep/Widgeon Lakes, Phase 3 restoration: McCormick Lake.
This project restores hydrologic connection to the Columbia River by removing/modifying existing flow control structures. Additional activities include placing large wood, controlling invasive species, replanting native vegetation, and excavating. The 100-acre site is located within 500 acres of US Forest Service owned property at the Sandy River Delta to the east of Sun Dial Island at Columbia River mile 122. The site historically was a mix of tidal forested and palustrine wetland floodplain habitat, but is now dominated by invasive plants (Himalayan Blackberry, Reed Cana
The Lower Columbia Estuary Partnership, U.S. Forest Service, and partners completed construction of fish passage and salmon habitat improvements within the historic Columbia River floodplain in September 2013. Construction crews, heavy equipment, and helicopters worked in the vicinity of Horsetail and Oneonta Creeks, five miles west of the Bonneville Dam, for two months. Revegetation efforts at the site are on-going.
This project completes a feasibility study to evaluate different restoration options within lower Hardy Creek. The site is located near the confluence of Hardy Creek and the Columbia in the Pierce National Wildlife Refuge at Columbia River mile 142. The lower portion supports salmonid populations, including spawning populations of chum, Coho, and steelhead. However, it and its neighboring side channels have unstable banks and lack large wood and riparian vegetation.
The goal of the mitigation plan is to increase diversity of plant and wildlife habitat on the site by establishing a native plant-dominated wetland habitat with a surrounding vegetative buffer. The mitigation plan was designed to alter the site's hydrology by capturing precipitation during the rainy season and modifying the existing pumping/drainage regime to allow increased water depth within the wetland basin. This creates an open water habitat in the winter and spring months.
This project creates a design plan to restore hydrologic connection between the Oaks Bottom Wildlife Refuge floodplain wetland habitat and the Willamette River.
Restoration at the Kandoll Farm site is part of the Columbia Land Trust and other conservation partner's larger Gray's Bay Conservation Effort, which began in 2003. The Estuary Partnership has supported this effort by providing funding for acquisition, restoration and monitoring at various sites. A majority of the initial work has now been completed; on-going maintenance and monitoring will continue for many years. Overall, the Grays Bay project set out to accomplish the following goals:
This project opens approximately 1.5 miles of spawning and rearing habitat for various native salmonid species by replacing an outdated hatchery diversion/fish ladder located at Columbia River mile 2 on the Chinook River. Without continual management, the previous structure acted as a passage barrier for both adult and juvenile salmonids. The new structure is a low maintenance diversion system designed to facilitate fish passage during any flow condition. The specific project objectives included: