The Hudson River Ground Stabilization Project is stabilizing 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 is mixing cement into the shallow riverbed on the Manhattan side of the Hudson River to stabilize the ground in preparation for tunnel boring and removing obstructions from the riverbed to clear a path for the tunnel boring machines.
Work began in the middle of the channel and is progressing eastward toward Manhattan. When the project is finished, there will be a block of reinforced earth 1,200 feet long and 100 feet wide that is strong enough for the tunnel boring machines to dig through.
Ground stabilization is being done within a temporary cofferdam to contain sediment and shield the work area from 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
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 EarthCam 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: