Rhododendron Park & Boathouse
This project increased accessibility to the Sammamish River and the Kenmore Boat Launch while protecting and enhancing sensitive wetlands and a shoreline of state-side significance. We designed a 234-ft long boardwalk that crosses over a wetland to connect the upper park, Metro bus stop, floating dock, new ADA parking, and an existing boat launch. Following completion of these improvements, Osborn Consulting continued supporting the City at Rhododendron Park through the design of the new 2,800-sq-ft Kenmore Boathouse, which is the only public access boathouse of its kind in the north Lake Washington region.
City of Kenmore
The new fiberglass grated boardwalk involved several innovative features. Pin piles were used to support the boardwalk to minimize impacts to the wetland. The wetland area and site near the river has highly compressible soils up to 20 feet deep that could lead to settling of civil structures. To combat this structural concern, the team designed pin piles to provide the necessary stabilization while minimizing wetland impacts. It was imperative that the new boardwalk and paths were wide enough for people carrying rowing shells from the park’s south parking lot to the floating dock. The engineering team modeled the path a rowing shell would travel to ensure the route would be accessible for portaging hand-powered watercrafts.
In 2022, the ASCE Seattle Section awarded the Kenmore Boathouse with a Local Outstanding Civil Engineering Achievement Award.
In 2019, the ASCE Seattle Section awarded the Kenmore Rhododendron Park Waterfront and Open Space Access Project with a Local Outstanding Civil Engineering Award.
The blue sheet metal exterior with translucent panels allows light to penetrate the boat storage bays and gives the boathouse its unique character.