The Tualco Valley is located at the heart of the Snohomish Basin where the Skykomish and Snoqualmie Rivers confluence to form the Snohomish River. Haskel and Riley Sloughs flow through the Tualco Valley with the potential to provide critical spawning and rearing habitat for Chinook, coho, and other ESA listed species. However, both sloughs have been largely disconnected by levees or other modifications, significantly reducing salmon access, and habitat quality and quantity. Haskel Slough (2.4 miles) has a deteriorating training dike at the upstream end that prevents surface flow connectivity with the exception of extreme flood events. Riley Slough (8.2 miles) is largely disconnected at its downstream confluence due to in-channel and floodplain modifications. The ultimate result of this project will be enhanced juvenile salmon rearing and flood refugia habitat in Haskel and Riley Sloughs by modifying the Haskel inlet dike and implementing a variety of flow conveyance and connectivity projects in Haskel and Riley Sloughs to promote increased connectivity, water quantity and water quality. This project phase will build off of conceptual designs and acquisitions currently underway (RCO Project #s 20-1140, 18-1720, 20-1265, 18-1737) to produce preliminary designs, acquire property rights, and conduct continued community outreach to facilitate final designs and construction in the subsequent project phase.