Puyallup Delta

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The Puyallup Delta is one of the two most degraded delta ecosystems in Puget Sound.

Nearshore Strategies Data Report

Cereghino et al 2012 completed a soundwide analysis to identify and describe river delta sites in Puget Sounds as part of a nearshore ecosystem restoration strategy (using remote sensing data c. 2000-2006). The following narrative of this delta site was developed to support distribution and use of analysis results:

The Puyallup Delta in the South Central Sub-basin historically contained 2,923 acres of vegetated wetland along a 46 km shoreline. The delta receives flow from a 251,672 square kilometer watershed. These characteristics make this system the 7th largest delta out of 16 systems in Puget Sound.
Simenstad et al 2011 found that this system had lost 100% of its vegetated tidal wetlands, and 100% of its shoreline length. Of the remaining shoreline, 100% shows some evidence of infrastructure development. In the surrounding uplands, 99% of land is estimated to have greater than 10% impervious surface. Across the watershed, 64% of land is estimated to have greater than 10% impervious surface. Based on these paramters, the site was given a degradation score of 74 out of 100, making it the 2th most degraded delta in Puget Sound. It faces a low risk of future development locally, and a high risk of development across the watershed. Approximately 43% of the watershed is currently impounded behind dams.


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