Keyport Pier Replacement

Completed in November 2002, this $6.2 million design-build project involved construction of a new berthing facility for vessels at the Keyport Naval Undersea Warfare Center. The scope of work included the design and construction of temporary and permanent mooring structures, relocation of the Acoustic Testing Facility, a new 121-foot-long floating pier, and demolition of two existing timber piers. All demolition, design and construction had to be completed in 720 calendar days.

The pier consists of two structures: the access trestle and the fixed pier. The access trestle extends 571 feet and features a 3-foot-wide pedestrian lane and a 15-foot-wide vehicle lane. The 28-foot-wide fixed pier provides 197 feet of vessel berthing and is skewed 26° from perpendicular, allowing a moored ship to present a minimal profile to tidal currents. Additionally, the T-shaped berthing pier was constructed on 18- and 24-inch-diameter steel pipe piles using precast caps and deck panels. The pier head mooring zones are protected by 14-inch square precast concrete fender piling.

To protect the juvenile salmon population in Puget Sound, demolition and construction were performed around two, three- to five-month closures totaling 300 calendar days. Mechanical and electrical utilities were provided for all new structures, along with relocation and installation of existing jib cranes and other vessel service equipment.