Just ran across a situation at work that had me doing the full Captain Picard facepalm.
One local government had to spend a bunch of money all at once on one of their bridges last summer. This is a small town with a tiny budget, so even though the bill was under $150K, it still hurt. They're asking for a special, extra grant of money to offset the costs to fix the bridge, because "this was totally unexpected, as the bridge passed all its previous inspections with no major issues." I was tasked with checking the inspection records to see if this was the case.
Apparently their idea of a bridge passing an inspection is that the inspectors didn't issue a Red structural flag and order it closed immediately.
Back in 2000 (the oldest inspection record available electronically) the bridge desperately needed some concrete repairs, some minor welding, and a new coat of paint.
In '02, '04, and '06, it didn't get any better.
And based on the load rating done using the data from the '06 inspection, the posted weight capacity had to be reduced to 18 tons. (For reference, a standard highway bridge should be able to support a fully loaded tractor-trailer, 80,000#/40 tons.) That should have given the town at least a subtle hint that the bridge might need some TLC.
At this point, based on the total condition rating, we started inspecting the bridge annually rather than every two years. (Condition was < 4 on a scale of 1 to 8, 8 = brand new, 1 = laying in the bottom of the creek.)
By the May 2014 inspection, the wooden deck was rotting (lack of maintenance), the concrete abutments were literally falling apart, there were more cracked welds (1930s welding technology) and the steel beams, which were barely adequate for today's vehicles to begin with (1930s steel, and none too large) have serious "section loss" because they were allowed to rust out (remember, the bridge needed paint prior to 2000.)
Even after the $150k of repair work, the bridge rating is only getting raised to 22 tons. If it had been properly maintained, it might have lasted another 20, 30 years or more.
