The Hudson River Ground Stabilization Project will stabilize the riverbed on the Manhattan side of the Hudson River to enable tunnel boring machines to excavate the new tunnel.
The Hudson River Ground Stabilization (HRGS) Project involves injecting grout into the silt that makes up 1,200 feet of shallow riverbed on the Manhattan side of the Hudson River then creating columns of soil mixed with cement and water. The end result will be a block of reinforced earth off the Manhattan shoreline that is strong enough for tunnel construction.
The HRGS Project is the first heavy construction project of the Hudson Tunnel Project (HTP).
Early surveying work to prepare for the HRGS Project began in May 2024, and heavy construction started summer 2024. Work began in the middle of the channel and is progressing eastward toward Manhattan.
Current Activities & Next Steps
Construction of the HRGS Project began in 2024 and is expected to conclude in 2027.
- Phase One included the design and construction of a test cofferdam, bathymetric and geophysical surveying, identification and removal of obstructions, and completion of a demonstration test program.
- Phase Two will use the findings from Phase One to complete the heavy construction portion of the project.
The area where ground stabilization work is taking place is enclosed by temporary sheet pile cofferdams to shield against currents in the river.
Quick Facts
Project Purpose
- Stabilize the riverbed to enable the start of tunnel boring and protect the river ecosystem
Notable Elements
- First heavy construction project of the HTP
- Work zones enclosed by temporary cofferdams to shield against currents
Estimated Construction Completion
2027
Contact Information
- 1-800-396-5238
- ManhattanConstruction@gatewayprogram.org
Upcoming Construction
You can see the progress we are making in real time via the EarthCam below! Click and drag the image to pan the camera. New photos are uploaded from the work site every day, and you can use the buttons below the image to peruse an archive of past photos.
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: