Clear Creek Floodplain Restoration, Silverdale, WA
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, including 5,000 ft of restored stream channel, placement of over 500 logs, excavation of 29,400 CY of cut to create the new channel and floodplain network, removal of 1,500 LF roadway and removal of 2 fish barrier culverts and a restored pedestrian trail network including 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 to engage and solicit input from adjacent private property owners, trail users and private interest groups.
“Kitsap County has won a 2017 VISION 2040 Award from the Puget Sound Regional Council for the Clear Creek Wetland and Flood Plain Restoration Project. The awards recognize innovative projects and programs that help ensure a sustainable future as the region grows.”
“Kitsap is using a strategic approach to its wetland restoration,” said Josh Brown, Executive Director of PSRC, “This project restored 30 acres and three stream branches, building on other investments throughout the Clear Creek Basin.”
“VISION 2040 is the region’s growth management, economic, and transportation strategy, designed to meet the needs of the 5 million people expected to be living in the region in 2040. It is an integrated, long-range vision for the future that lays out a strategy for maintaining a healthy region – promoting the well-being of people and communities, economic vitality, and a healthy environment.”