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

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

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

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

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

This Taiyo project page references Trending Now Infrastructure along with the original URL (https://www.infrastructure-now.co.uk/article/445710/tbm-starts-excavating-tunnel-under-potomac-river). Taiyo standardizes official data into a consistent, searchable project profile.

Potomac River Sewer Tunnel

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

Source: Trending Now Infrastructure

Project

Under Construction

An 8.8km deep sewer tunnel is being excavated under the Potomac River in Washington DC using a tunnel boring machine named Mary. The project involves assembling gantries progressively to support power, ventilation, material transport, and worker access systems. The tunnel will reduce sewage overflows into the river by 93%.

Status: Under Construction
Sector: Water Supply and Storage, Tunnel, Power Generation (CCGT), Waste Processing and Treatment
Location: Washington DC, District of Columbia, United States of America
Updated: 22 Jul 2026
Source: Trending Now Infrastructure

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Project Information

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

Participants

Not available for this record.

Status

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

Contact

Not available for this record.

Description

Description	An 8.8km deep sewer tunnel is being excavated under the Potomac River in Washington DC using a tunnel boring machine named Mary. The project involves assembling gantries progressively to support power, ventilation, material transport, and worker access systems. The tunnel will reduce sewage overflows into the river by 93%.
Original sector	Water and Wastewater
Budget

Location

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

Source

Source	Trending Now Infrastructure
URL

More Details

Record type	Project
Sector	Water Supply and Storage, Tunnel, Power Generation (CCGT), Waste Processing and Treatment
Article published date	2026-04-23

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Potomac River Sewer Tunnel

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