Seawall construction continues with marine mattress and zee panel installation

After installing the first seawall face panels along the waterfront south of Colman Dock, the Elliott Bay Seawall Project is continuing to build infrastructure and habitat enhancements in this area. Recently, marine mattresses, plastic mesh bags filled with stone, were installed along the new seawall panels. These provide a shallow water habitat for migrating salmon and other sea life as they travel along the seawall. Check out the snapshot video of marine mattress installation.

After the marine mattresses were put in place, zee panels were installed – a critical step in building the new seawall. These large, zee-shaped concrete panels provide a counterbalance and support structure for the new overhanging sidewalk. This activity was tidally influenced, so work was completed in the early morning hours while the tide was low.

Zee install 6

Row of installed zee panels south of Colman Dock

Work also continues between Pike and Madison streets, where activities include rip rap removal and steel sheet pile installation.

For more information about seawall construction, visit the Seawall Project website. If you have questions, email the Seawall Project (seawall@waterfrontseattle.org) or call the 24-hour hotline (206.618.8584