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Site Visit: Managing a Shifting Hydrology in a Wetland Restoration Project
Duwamish Hill Preserve
3800 S 115th St.
Tukwila, WA 98168
Friday, July 20, 2018, 9:00 AM - 11:30 AM PST
Category: Affiliate Events

Visit to the Creston-Duwamish Transmission ROW: Managing a Shifting Hydrology in a Wetland Enhancement and Restoration Project

Guided by Charlie Vogelheim, Stewardship Coordinator, Forterra & Rory Denovan, Restoration Ecologist, Seattle City Light

Seattle City Light (SCL) is working on a wetland re-establishment, rehabilitation, and enhancement project in order to mitigate for recent impacts on several wetlands and buffers in Tukwila. The unique project at the Creston-Duwamish Transmission ROW called for the construction of several “hummocks and hollows” within a perched wetland, adjacent to the Duwamish River that would provide several vegetation habitat niches.

What should have been a straightforward wetland mitigation project has experienced several challenges due to an unexpectedly shifting hydrology. There is much to take away from this fascinating case study in wetland restoration that sits at the confluence of issues with site history, adjacent properties, climate, and design.