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Habitat Mitigation Credits

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Vicinity Map
Mitigation Bank Service Area - Click to Enlarge

New Mitigation Bank

The Port of Seattle is establishing a Multi-Site Wetland Mitigation and Habitat Conservation Bank within the Green Duwamish Watershed, known as Water Resource Inventor Area 9 (WRIA 9). This watershed has been heavily developed over time, degrading estuarine, riparian, and freshwater wetland environments. The bank will rehabilitate ecological functions and restore priority habitat, while facilitating sustainable growth and development throughout the region. The service area for the mitigation bank includes key sub-watersheds that are critical for local salmon recovery plans – the Lower Green River, the Duwamish Estuary, and marine nearshore areas.

Over the next ten years, the project will generate more than 500 credits (called “Discounted Service Acre Years,” or DSAYs) which can be used to resolve Natural Resource Damages (NRD) liability. Over 200 competitively priced NRD credits will be available for sale mid-2022. In the near future, the project will also be able to provide conservation credits which can be used to satisfy Endangered Species Act requirements. Revenue generated by the Port through mitigation credit sales will be reinvested in habitat restoration projects in the Green-Duwamish Watershed and Elliot Bay.

The service area for the mitigation bank includes key sub-watersheds that are critical for local salmon recovery plans – the Lower Green River, the Duwamish Estuary, and marine nearshore areas.


Mitigation Credit Release Schedule

Credits will be released over a ten-year period based on satisfaction of key project milestones.

Milestone Percentage of total credits released
Construction complete;
"Time-zero" monitoring
50%
Year 1 performance monitoring 10%
Year 3 performance monitoring 10%
Year 5 performance monitoring 10%
Year 7 performance monitoring 10%
Final performance monitoring 10%

 


Map of Mitigation Bank Project Sites
Mitigation Bank Project Sites - Click to Enlarge

Mitigation Bank Project Sites

 

 

 

 

 

 


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