# Seattle Completes Ship Canal Storage Tunnel

Seattle completed the Ship Canal Water Quality Project, adding a 4.3-kilometer underground tunnel that can temporarily store more than 112 million liters of stormwater and wastewater during heavy rainfall. The system is expected to prevent about 284 million liters of contaminated water from reaching nearby waterways each year by reducing combined sewer overflows. The project demonstrates municipal demand for large-scale drainage, wastewater, and climate-resilience infrastructure, but the signal identifies no active solicitation or contract value.

- The project is relevant to contractors and suppliers with experience in underground construction, stormwater management, wastewater systems, and urban water infrastructure.
- Seattle Public Utilities, the City of Seattle, and King County are identified government entities; Lane Construction is listed among the extracted vendors, but its specific project role is not stated.
- Because the project is already completed and no current procurement opportunity is identified, businesses should treat it as an example of infrastructure demand rather than an open bid, and use the documented storage capacity and overflow-reduction goals as context for comparable municipal work.

**Jurisdictions:** sled
**Industries:** Construction & Infrastructure
**Topics:** Physical Infrastructure
**Published:** October 28, 2026

### Government Entities
- Seattle Public Utilities
- City of Seattle
- King County

### Vendors
- Lane Construction ()

### Sources
- [
                    Seattle Takes On the Rain With a 112-Million-Liter Tunnel - We Build Value
            ](https://www.webuildvalue.com/en/stories-behind-projects/rain-tunnel-seattle.html) - We Build Value