The Port Susan Bay (PSB) Restoration for Resiliency Sub-Phase 2021 project, at the mouth of the Stillaguamish River, will restore key ecological processes to 35 acres of estuarine tidal marsh while testing a novel channel excavation method. The proposal seeks funds to support initial site work using buried blast charges to carve interior marsh channels in the north section of the PSB restoration site. Blasting channels has the potential to lower project costs as well as minimize ground disturbance, reducing ecological impacts to the marsh. Lessons learned from this project will inform implementation of the larger 115 ac restoration project at PSB as well as future tidal wetland projects in the region. The full PSB 150-ac project will expand functional estuary habitat through increased channel connectivity, and increase ESA-listed juvenile salmon rearing capacity. This project is a regional priority; it supports upstream salmon recovery projects by providing the functional rearing area needed to avoid a critical fish habitat bottleneck at the estuary. The project enhances future delta restoration: the Stillaguamish Tribe has acquired a 248-ac upstream-adjacent parcel with plans to restore it to estuarine marsh. Hydrologic connectivity across both sites will expand marsh extent and resiliency, while also providing upstream flood relief. Thus, the PSB project is part of an integrated effort to advance fish, flood, and farm benefits in the lower Stillaguamish watershed.