While substantial inspection and corrective work has been accomplished at the two upper Manhattan stations, including the erection of a temporary shield at 181st Street, some additional stabilization work will be performed and temporary structures will be repositioned to maximize space along the platform.
Inspections performed last weekend revealed some areas of brickwork in the vaulted segment of the 168th Street Station that had to be stabilized. Additionally, NYC Transit maintenance workers stabilized areas of loose plaster, concrete and brick located in the extension part of the northbound platform.
Opened in 1906 and built as part of the Fort George Tunnel, both stations are of similar design and blasted out of bedrock 100 to 125 feet below St. Nicholas Avenue in Washington Heights. Known as the Washington Heights Mine Tunnel when built, this is part of the deepest section of subway in the City.