olympic pier extension - nbk-bangor
In 2017, the U.S. Navy asked WSP (then BergerABAM) to help modernize a critical pier at Naval Base Kitsap–Bangor in Silverdale, Washington. The goal was ambitious: expand the base’s ability to support two additional SEAWOLF‑class submarines by extending and upgrading an existing pier. These vessels demand robust facilities with highly reliable utility systems and specialized mooring solutions that can safely handle large tidal changes. The resulting project represented a $91 million investment in mission-critical national defense infrastructure.
The project included design of a 520‑foot‑long pier extension, associated electrical and mechanical utilities, a new compressor building, remodeling of existing utility structures, stormwater treatment improvements, and partial replacement of an existing wave screen. Constructed at the southern end of the existing pier, the extension was designed as an independent structure separated by a seismic joint to accommodate site‑specific seismic demands while maintaining uninterrupted base operations. Beyond typical waterfront design requirements, the project demanded innovative engineering solutions to address significant seismic risk, including soil liquefaction, extreme environmental exposure, and a tidal range exceeding 20 feet. The design also required careful consideration of both construction and long‑term operational effects on surrounding natural resources within a sensitive marine environment.
A defining feature of the project was the design of floating concrete camels, and associated mooring systems, capable of accommodating multiple submarine platforms throughout their service life. Camel geometry and stability were highly sensitive due to asymmetrical cross‑sections and sloped berthing faces, requiring detailed evaluation of performance across all life stages, including fabrication, dry‑dock flooding, towing, installation, and in‑service conditions.
Completed in 2022, the facility, now known as Olympic Pier, has become a cornerstone of the Navy’s Pacific Northwest submarine operations. Continued investment in the site reflects its success: in 2024, the Navy commissioned additional design work to further enhance small‑craft support at the pier, with construction expected to be completed in late 2026.
This project received a 2026 PCI Design Awards ‘Honorable Mention’ in the Transportation-Special Solution category as well as recognition from the Society of American Military Engineers, receiving the 2025 award for SAME Projects of Excellence – Large Business/Complexity category.
This annual lecture honors Professor Emeritus Dr. Paul Zia, former professor and department head of NC State’s Department of Civil, Construction, and Environmental Engineering, and a structural engineer who was eminent in research, professional society leadership and practice.
