The first sudden collapse happened during construction, in August 1907. In just 15 seconds, the south anchor arm, the cantilever arm, and the partially completed suspended span fell 150 feet (45 m) into the St. Lawrence River. 75 of the 86 workers on site were killed, and the remaining 11 suffered injuries.
the disaster, the Canadian government decided that the project must be
completed in order to establish the rail link for the railway system.
Construction began again in 1913, and by 1916, the bridge was nearly completed.
On the morning of September 11, the workmen faced a difficult task in moving
the span upstream, and all went well with that part of the job. However, around
midday, something went terribly wrong. One corner of the span tore away and
sagged. A few seconds later, the other ends pulled off their supports and the
whole span came loose and disappeared into the river. Thirteen men lost their lives,
and several others were injured.
Clancy's comment: Mm ... it seems to have been cursed.