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Elliott Bay Seawall

Seattle Central Waterfront

The ambitious Elliott Bay Seawall project provides a new, modern, earthquake-ready seawall along Seattle’s busy waterfront that replaces the aging timber-supported wall built more than 70 years ago. This replacement will protect critical infrastructure and utilities, while enhancing the marine habitat for aquatic life.

OBEC provided construction management and inspection support for demolition of the existing pile-supported roadway and concrete seawall face, utility relocations, stabilization of the soil, and construction of the cantilevered precast concrete structure. OBEC was part of the field team that tracked and documented changed and protested work, negotiated support services budgets for contract payments, and provided general contractor quality control and project documentation.

Services Provided

  • New light-penetrating surfaces on the sidewalk allow more light to reach the water below, which enhances the habitat for aquatic life. A textured face on the seawall also encourages the growth of vegetation for the benefit of sea life.
  • The project included jet grout installation to provide main structure support and improve seismic stability.
  • Unique features included permeation grout installation on top of the jet grout columns to reinforce the structure.