Haskel Slough Connectivity

Tulalip Tribes completed conceptual designs for a future restoration project on Haskel Slough, a ~2.4 mile long (71 acre) side channel of the Skykomish River near Monroe, Washington. The slough provides critical spawning and rearing habitat for Chinook salmon and other listed fish species. There is a deteriorating training dike at the upstream end of the slough that prevents surface flow connectivity with the exception of extreme flood events. The goal of the future restoration project is to enhance juvenile salmon rearing and flood refugia habitat in Haskel Slough by modifying the inlet dike to promote increased connectivity, water quantity and water quality. Additional project benefits will include floodplain water storage, and prevention of safety and infrastructure damage resulting from catastrophic dike failure. As part of this initial planning phase, Tulalip Tribes will conduct a land owner willingness assessment and feasibility analysis including development of potential connectivity alternatives, associated geomorphic analyses, HEC-RAS 2d hydraulic modelling, extensive community outreach, a preferred alternative, and conceptual designs that align to SRFB Manual 18 Appendix D-1 standards.

Design a restoration project that will Increase connectivity of 2.4 Miles of priority off-channel habitat.
Increase connectivity of 71 Acres of priority off-channel habitat.
Increase water quantity and quality of priority off-channel habitat.
Increase safety resulting from engineered dike modification.
Increase protection of infrastructure from engineered dike modification.