Clear Creek

NSD provided stream and floodplain restoration designs over an 11-acre site in response to repeated flooding in downtown Silverdale, WA. NSD used HEC-RAS and sediment transport analysis to identify preferred channel locations, avoid impacts to existing high-quality wetlands and reduce roadway flooding.  NSD, under the direction of Project Manager Rocky Hrachovec, led a 5-firm team to develop final designs and acquire permits. The project was successfully bid at a cost of $2.2 million and construction was completed summer 2016. The project included 5,000 ft of restored stream channel and placement of over 500 logs. 29,400 CY of cut was also excavated to create the new channel and floodplain network, while we removed 1,500 LF of roadway and 2 fish barrier culverts. We also restored a pedestrian trail network which included installation of three 40-ft span bridges. The project has successfully restored aquatic spawning and rearing habitat for chum and coho salmon and reduced flood risk to the town of Silverdale. Products included a wetland features map, including locations of vegetative communities and buffer zone and riparian and channel enhancement plans.  Project success required that NSD staff lead complex negotiations with multiple stakeholders including the County, the Suquamish Tribe, WDFW, ECY and USACOE to address conflicting priorities and participate in numerous public outreach events during design development. NSD engaged and solicited input from adjacent private property owners, trail users and private interest groups.