Wetland Mitigation Evaluation Study

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Members of the Site Assessment Team completing the site assessment at a wetland mitigation site in Snohomish County.
The Phase 2 study found a net gain of open water and aquatic bed as a result of mitigation activities.
An Eastern Washington created wetland that provided a high contribution to water quality and wildlife habitat.
One of the few restoration sites evaluated in the Phase 2 study.
This enhanced wetland was minimally successful. This project met permit requirements by enhancing vegetation structure, but it did not provide a sufficient contribution to compensate for the wetlands lost.
The mitigation actions on this site failed to enhance any wetland functions.
Surrounding land uses influence the success of mitigation projects. Proximity to high density residential areas can decrease the wetland’s ability to provide habitat functions.
Is it a wetland? The Site Assessment Team used the WA State Wetland Delineation Manual to determine wetland boundaries. Presence of hydric soils is one of the necessary components.
Skunk cabbage (Lysichitum americanum) was present along with other native wetland species at this created wetland in King County, which was moderately successful.