Collection search - St. Lawrence Seaway construction

Title based on the following caption from the NFB Photo Story: The work went on summer and winter, often in the face of staggering obstacles, and sometimes with crews engaged on "crash" programs calling for herculean efforts on a 24-hour a day basis. Hundreds of huge and ingenious pieces of machinery clawed at the bed of the great river, changing its ancient course, and reshaping it to the needs and design of man. Above, first steel is laid for the superstructure of the Mercier Bridge, one of 4 bridges in the Montreal area which had to be partly rebuilt to provide 120 foot clearance for the giant ocean freighters which can now sail 2,300 miles inland to the heart of one of the great industrial regions of the world.