Mountains to Sound Greenway Trail

The Mountains to Sound Greenway Trail project involves the construction of a multi-use trail, including the removal of structures and obstructions, construction of soldier pile walls, block walls, and bridges, as well as storm drainage improvements, bioretention and LID construction, and traffic signal system modifications. The project is funded in part by the Federal Highway Administration (FHWA) and the Washington State Department of Transportation (WSDOT), and includes voluntary goals for minority, small, veteran, and women business enterprise (MSVWBE) participation. The contract was awarded to multiple vendors, with IMCO General Construction being the lowest bidder at $15,572,264.00. The project scope includes: • Remove Structures and Obstructions • Construct Soldier Pile Wall and Soldier Pile Tieback Walls • Construct Block walls • Construct bridge over I-90 Offramp and Factoria Blvd SE • Construct Tunnel under I-90 ramps • Construct Cement Concrete Curb and Gutter • Construct Multi-Use Trail • Storm Drainage Improvements • Bioretention and LID Construction • Traffic Signal System Modifications • Lighting and Communication System Construction • Grind and Overlay of Pavement • Urban Design Element Construction and Installation • Landscaping and Irrigation • Property Restoration and Miscellaneous Work The project also includes the installation of various plants, trees, and shrubs, as well as the construction of bike racks, trash receptacles, and benches.