Nisqually Delta Distributary Restoration Pre-design

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Nisqually refuge from near ring dike.jpg

This project will conduct regional pre-design for restoring sediment and freshwater flow to increase the function and resilience of the Nisqually Delta.

The USGS, Nisqually Indian Tribe and USFWS propose to assess and prioritize identified adaptive management opportunities to restore sediment delivery to Nisqually Delta’s vulnerable tidal marshes. A refined process-based sediment transport model helps inform the sediment supply required and distributary channel designs needed to recover a sediment deficit resulting in ~1m of historic subsidence and tidal marsh salmon-rearing habitat vulnerable to projected sea level rise. The models and tools developed inform salmon ecosystem capital investment decisions with mutual benefits to flood risk reduction and climate resilience planning in the Nisqually Delta and similar floodplain-estuary systems of the Pacific Northwest.