This is not a record breaker, at a span of 3060ft,with towers of 487ft high and minimum height over the river of 250ft, but an interesting article from my mid 1930s "Wonders of World Engineering" book. The span was constructed over the river Thames at Dagenham (also the site of the Ford UK car factory) in 1932, during the construction of the UK National Grid. The article includes some photos of working practices of the time - for instance, the petrol driven winch sitting on baulks of wood near the top of the tower, working in white shirt, tie and braces and working at height with little protection. It's hard to see how much PPE was in use (other than a cloth cap!), particularly harnesses, unless they were tied on by their tool belts...
P.S. After several attempts, it seems impossible to get the forum to save the attachments in the correct order!