This week, the I Lift NY super crane installed the new eastbound span’s final structural steel girder assembly for this phase of construction. The remaining girder assemblies will be placed after the demolition of the existing Tappan Zee Bridge. On the westbound span, the super crane will install the final handful of girder assemblies during the coming weeks.
Tappan Zee Constructors, LLC (TZC) will install a total of 31 miles of steel girders, cumulatively weighing more than 100,000 tons, for the new twin-span bridge.
Westchester Landing Work
TZC is preparing to pour concrete for the new Westchester landing in Tarrytown this coming week. Work will necessitate the use of multiple concrete trucks, which will travel near South Broadway in the area of the southbound Thruway.
Noise Barrier Construction
Noise barrier construction along the southbound New York State Thruway (I-87/I-287) in South Nyack progresses this week with the completion of retaining wall panels between the South Broadway bridge and River Road. With these foundations in place, TZC will begin installing concrete noise barrier panels in the area. All panels are treated with sound-absorbing material to further reduce traffic noise in the nearby community.
TZC also will continue constructing foundation walls for the future highway and shared-use path along the northbound Thruway in South Nyack. The operation is scheduled to continue in the coming months.
Main Span Cable Installation
TZC continues to install the new westbound span’s stay cable system. The stay cables are comprised of numerous metal strands, tightly packed in a protective sheath. After the initial installation process, TZC will install additional strands inside the sheath to provide further strength.
TZC will install new structural steel sections and stay cables on alternating sides of the towers as work continues. TZC will also place precast concrete deck panels on the erected steel sections to provide a base driving surface.
Maintenance Dock Construction
TZC will continue constructing a New York State Thruway Authority maintenance dock near the new bridge’s Rockland landing. The work involves partially dismantling the existing work trestle that was used to construct the westbound span of the new bridge. Work will take place during daytime hours and will include the installation of several piles to support the dock’s boat slips. The construction efforts are expected to conclude later this year. Pile driving operations will be limited from 8 a.m. to 6 p.m. on weekdays.
Additional work includes:
- Main span tower construction
- Support for river-based work from the Rockland trestle
- Rockland landing retaining walls
- Survey inspections on the existing bridge
- Utility work at the Westchester landings
- Girder assembly placement
- Bridge road deck installation
- Drainage structure installation
- Maintenance facility construction in Tarrytown
- Soil boring in South Nyack
- Pier foundation work
Boater Safety
Marine units are continuing patrols to monitor the construction zone and encourage all boaters to obey the established U.S. Coast Guard safety protocols. Tune to Marine Radio Channel 22A for the latest U.S. Coast Guard advisories.
Boaters are strongly urged to use the center 600 feet of the main channel (when available) to navigate in a north-south direction with no wake at a maximum speed of five knots. There will be periodic closures of the main channel due to on-going construction activities. Boaters are strongly encouraged to avoid the project site during these closures. Tune to Marine Radio Channel 22A for the latest U.S. Coast Guard advisories. Boaters in the area are advised to communicate with the project team via Marine Radio Channel 16.
The U.S. Coast Guard has established a Safety Zone surrounding 16 construction barge mooring locations at the project site. No unauthorized vessels are allowed in the Safety Zone. The U.S. Coast Guard also has established a safety zone encompassing all navigable waters within a 200-yard radius of the largest machine on the project, the I Lift NY super crane, legally registered with the U.S. Coast Guard as the Left Coast Lifter.
In addition, marine law enforcement will be enforcing the rules of the expanded Regulated Navigation Areas (RNAs) east and west of the Safety Zone. The RNAs stretch 500 yards north and 500 yards south of the existing bridge. The Eastern RNA will be extremely active and vessels transitioning to and from the eastern shoreline at Tarrytown should approach and depart to the north. The Western RNA will be impassable at times and mariners should stay clear of the area.
Mariners also should be aware that TZC will continue work in the vicinity of the side channels under the existing bridge. Mariners are advised to stay clear of all overhead work and maintain a safe distance of 1,000 feet from all construction equipment and support vessels. In addition, all bridge piers and abutments are protected by a 25-yard security zone.
Additional temporary navigational lights have been installed on the existing bridge to further define the 600-foot navigation channel under the main span. Permanent elements of the new bridge are lit per U.S. Coast Guard permit requirements, as are all moorings, barges and other equipment. All mariners should consult the latest USCG Local Notice to Mariners before transiting this area.
More New NY Bridge boater safety information, including the U.S. Coast Guard Notice to Mariners and construction site map can be found at NewNYBridge.com/Boater. The page includes an interactive GPS map showing vessel locations on the Hudson River, detailing which vessels are stopped and which are in motion to a new location, for recreational and commercial boaters to get current information on the very active construction zone. The vessel tracking map is for informational purposes and not intended for navigation.
