Urbanisation

1960 · 23521 — 1960. Bridge construction photo archive depicting the crews equipment and labor required to build a small road bridge during the postwar expansion of American highway and local road networks. The photographs likely document the 1960s to early 1970s when pre-stressed concrete beams had become common in bridge work and heavy trucking allowed long prefabricated members to be delivered directly to job sites. In the 1960s bridge construction relied much more on manual surveying paper plans and workers doing dangerous tasks directly on-site. The Occupational Safety and Health Act of 1970 which gave the federal government authority to enforce workplace safety standards was not revised until the 1990s. The photos show a different industry standard for safety enforcement on job sites compared to contemporary labor safety codes. The archive shows drilling foundations preparing abutments hauling girders positioning cranes and lowering long concrete beams into place over a creek or river crossing.<br /> <br /> Photo archive of 20 silver gelatin photographs 3.5 x 4 inches United States circa 1960s-1970s. Workers stand beside cranes tracked equipment tractor-trailers and long prestressed concrete beams at a rural or suburban bridge site. Trucks marked "Yost Construction Inc." haul bridge members through town and onto the work site while a drilling rig marked "Rotary Drilling" and "water systems and service" operates near the roadbed. Several scenes show cranes lifting or preparing to lift girders crews guiding beams by hand concrete supports rising from the water and the bridge span taking shape between tree-lined banks. A man is seen walking across the beam laid for the bridge in its early stages without strapping harnessing or today's standards of safety.<br /> <br /> The Federal-Aid Highway Act of 1956 accelerated road building across the United States and state and county bridge replacement projects followed the same demand for stronger crossings heavier vehicle loads and faster construction methods. This archive records the practical labor behind that expansion rather than finished civic architecture with attention on machines crew placement contractor trucks and the sequence of bridge assembly. Light handling wear and minor curling; overall in very good condition. unknown