What is the latest status of the project “Potomac River Tunnel”?

The status recorded for “Potomac River Tunnel” is under construction.

Who are the main government, EPC, and private stakeholders for “Potomac River Tunnel”?

Taiyo maps the stakeholders of “Potomac River Tunnel”: government bodies (DC Water).

What is the budget and commercial profile for the project “Potomac River Tunnel”?

Taiyo normalizes the budget of “Potomac River Tunnel” to USD 819000000.

Where can I verify the source and access all details for “Potomac River Tunnel”?

This Taiyo project page references Tunnel Business Magazine along with the original URL (https://tunnelingonline.com/dc-water-to-hold-ceremonial-blessing-for-potomac-river-tbm/). Taiyo standardizes official data into a consistent, searchable project profile.

Potomac River Tunnel

Sector: Water Supply and Storage • Location: Washington, District of Columbia, United States

Source: Tunnel Business Magazine

Project

Under Construction

The Potomac River Tunnel project involves the construction of a tunnel to prevent combined sewage and stormwater overflows from entering the Potomac River. Two tunnel boring machines, Mary and Emily, will dig northward and southward respectively to build the tunnel system that carries stormwater and sewage to DC Water’s Blue Plains Advanced Wastewater Treatment Plant.

Status: Under Construction
Sector: Water Supply and Storage, Tunnel, Waste Processing and Treatment, Government
Location: Washington, District of Columbia, United States of America
Updated: 22 Jul 2026
Source: Tunnel Business Magazine

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Project Information

5 Q

The project “Potomac River Tunnel” is an infrastructure initiative in the Water Supply and Storage sector, located in Washington, District of Columbia, United States. Taiyo aggregates data on it from Tunnel Business Magazine.

Participants

Sponsoring Agency

Status

Original status	under construction
Taiyo status	Under Construction
Taiyo last update	2026-07-22

Contact

Not available for this record.

Description

Description	The Potomac River Tunnel project involves the construction of a tunnel to prevent combined sewage and stormwater overflows from entering the Potomac River. Two tunnel boring machines, Mary and Emily, will dig northward and southward respectively to build the tunnel system that carries stormwater and sewage to DC Water’s Blue Plains Advanced Wastewater Treatment Plant.
Original sector	Water Infrastructure
Budget

Location

Country	United States of America (USA)
State	District of Columbia
City	Washington

Source

Source	Tunnel Business Magazine
URL

More Details

Record type	Project
Sector	Water Supply and Storage, Tunnel, Waste Processing and Treatment, Government
Article published date	2025-11-02

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