The Hudson River Ground Stabilization Project is preparing the path for the tunnel boring machines to build the section of the new tunnel under the Hudson River.
The Hudson River Ground Stabilization (HRGS) Project is preparing a section of the riverbed on the Manhattan side of the Hudson River for tunnel boring by removing obstructions and mixing lightweight concrete into the riverbed to stabilize the soft soil.
Work began in the middle of the channel and is progressing eastward toward Manhattan. The in-water work area is contained within a temporary cofferdam to shield against currents in the river. The cofferdam consists of interlocking sheet piles – essentially steel walls – between large, hollow steel cylinders known as king piles, which provide additional strength and stability.
Read our blog post for more information about the history of cofferdams and how the HRGS cofferdam was built.
Quick Facts
Status: In Progress
Project Purpose
- Stabilize the riverbed in preparation for tunnel boring
- Clear obstructions from the path the tunnel boring machines will take under the Hudson River
Notable Elements
- First heavy construction project of the HTP
- Work zones enclosed by temporary cofferdams to shield against currents
Contact Information
- 1-800-396-5238
- ManhattanConstruction@gatewayprogram.org
Upcoming Construction
- Cofferdam Shifts Eastward (6/29/2026)
- Boater Safety Alert
See Our Progress
Construction of the HRGS Project began in 2024. This is the first heavy construction project of the Hudson Tunnel Project.
You can see the progress we are making in real time via the construction camera below! Click and drag the image to pan the camera. Use the buttons below the image to peruse an archive of past photos.
You can see more photos and videos from all of our
construction sites in our Photo Gallery and Video Gallery.
Join GDC’s Boater Safety Alert Mailing List
The Gateway Development Commission sends out regular Boater Safety Alerts in advance of upcoming work. To be added to GDC’s Boater Safety Alert mailing list, please fill out the form below: