DESCRIPTION
City of Edmonds used funding to advance feasibility and conceptual designs to daylight Willow Creek and restore Edmonds Marsh, a remnant barrier estuary located in the nearshore within the City of Edmonds in south Snohomish County. This phase of the planning project resulted in the following deliverables:
• Conceptual designs for an alternative channel alignment across the Unocal property to provide a wider meandering channel setback from the railroad tracks to allow for increased channel complexity, reduced velocities, wider vegetated buffers, and enhanced habitat value;
• Sediment quality assessment of areas within the marsh where interior channels for water conveyance and juvenile salmon habitat enhancement will be constructed;
• Water quality assessment of freshwater and stormwater inputs to the marsh;
• Preliminary hydraulic modeling necessary to inform design, including modeling habitat conditions of the daylight channel configuration for channel depth and temperature, modeling of proposed flood protection measures, and flows in the daylight channel along Marina Beach Park to assess for potential safety hazards;
• Hydraulic modeling of site specific sea-level rise scenario and extreme tide conditions;
• A report of on-going communications and negotiations between the City and WSDOT-Ferries.
The city continued communications with stakeholders in this project phase, including Washington Department of Transportation- Ferries Division who is slated to be the future owner of the Unocal Property. The city had hoped to enter into a signed MOU with WSDOT-Ferries outlining control and tenure of the Unocal site and clearly stating the intention to construct the preferred alternative channel alignment across the Unocal property, but that is still under negotiation.
This project builds upon previous Edmonds Marsh restoration planning grants (11-1553 and 13-1107) focused on feasibility and conceptual design alternatives. The long term project goal is to construct a restoration project to enhance and restore connectivity to juvenile rearing and refuge habitat for Puget Sound Chinook salmon.