Lions Gate Bridge Rehabilitation

Lions Gate1

Over a period of approximately eight months the deck of the 60-plus year old Lions Gate Bridge in Vancouver was replaced section-by-section. Extensive seismic upgrading of the North Viaduct also took place as well as improvements to the Stanley Park Causeway. To minimize interference with the roughly 65,000 vehicles that crossed the bridge every day, the deck replacement work was done during a series of nighttime and weekend closures of the entire bridge. This nighttime work meant that noise from the rehabilitation work had greater potential to disturb residents within adjacent suburban areas, particularly within the Municipalities of North and West Vancouver. Wakefield Acoustics Ltd. was retained by the B.C. Transportation Financing Authority to assess the potential community noise impacts from all aspects of the bridge rehabilitation and recommend practical measures which could be taken to minimize these impacts. The assessment included baseline noise monitoring in the potentially impacted communities, modeling of the community noise exposures during the various phases of bridge rehabilitation and identification of those activities likely to create significant noise impacts. By scheduling of the noisiest preparatory activities (rivet busting and pin driving, impact wrenches, metal chipping) for execution during the daytime prior to the removal of each deck section, and with the benefit of an effective community communications plan, complaints about project noise from the surrounding community were largely avoided.