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

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

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/from-new-york-roots-to-national-reach/). Taiyo standardizes official data into a consistent, searchable project profile.

Potomac River Tunnel

Sector: Waste Processing and Treatment • Location: Washington, D.C., District of Columbia, United States

Source: Tunnel Business Magazine

Project

Under Construction

Potomac River Tunnel project in Washington, D.C., part of DC Water’s Clean Rivers Program, involving construction of a 5.5-mile, 18-ft diameter deep tunnel with two TBMs, nine shafts, and complex near-surface CSO structures to reduce combined sewer overflows and improve water quality.

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

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Project Information

4 Q

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

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	Potomac River Tunnel project in Washington, D.C., part of DC Water’s Clean Rivers Program, involving construction of a 5.5-mile, 18-ft diameter deep tunnel with two TBMs, nine shafts, and complex near-surface CSO structures to reduce combined sewer overflows and improve water quality.
Original sector	Water and Sewer Infrastructure
Budget

Location

Country	United States of America (USA)
State	District of Columbia
City	Washington, D.C.

Source

Source	Tunnel Business Magazine
URL

More Details

Record type	Project
Sector	Waste Processing and Treatment, Water Supply and Storage, Tunnel
Article published date	2026-05-08

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