Ship Canal Water Quality Project - Storage Tunnel project
Start of works
Data updated to August 2021
Ship Canal Water Quality Project – Storage Tunnel project, consists of building a 2.7 mile (4.2 km) long water storage tunnel to reduce flooding Lake Washington Ship Canal with polluted water.
Lane Construction Corporation, the US subsidiary of Webuild Group, is the contractor carrying out the works per the project that will keep an annual average of 276 million liters of contaminated rain water and waste water out of the Canal, from Salmon Bay and Lake Union.
The TBM (tunnel boring machine), passed technical tests in Germany, has been assembled in Seattle and started excavating the tunnel in august 2021.
Client of the works is Seattle Public Utilities.
Annual avarage storage capacity (l)
TBM diameter (m)
Benefits and advantages of the work
Combined sewage conveyed per year (m3)
People in the catchment area