POV sail-by construction activity on New York City's Triborough Bridge

Shot from below bridge of span being added to the Triborough Bridge (later known as the Robert F. Kennedy Bridge) / shot from moving boat of span being placed in position, tugboat in foreground / shot from moving boat as it passes two men on tugboat near span, then tugboat next to span, then one base of bridge tower, then end of span, then other base of bridge tower, then tugboat on other side of span / Note: exact day not known