Ship Canal Water Quality Project - Storage Tunnel project

Waste Water Management Plants

Start of works

October 2019

Progress status

19%

Data updated to August 2021

Medina, Seattle, United States
SDG Obiettivi di sviluppo sostenibile
Clean water and sanitation Clean water and sanitation

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.

Technical data

Annual avarage storage capacity (l)

276,000,000

Length (km)

4.2

TBM diameter (m)

5.5

Sustainability

Benefits and advantages of the work

Combined sewage conveyed per year (m3)

132,750

People in the catchment area

48,300

Multimedia

Milestones

12/08/2021

Tunnel excavation begins for Ship Canal Water Quality Project