1 year: at Knotts Berry Farm, the rusty car of the Xcelerator falls off the track of the roller coaster. The entry cracks as the concrete slowly collapses.
25 years: The concrete pillars of the entry way crack, and the roof falls down.
50 years: The big one, a 8.0 on the Richter scale, shakes Orange County. The huge arch falls down, and the turned segments collapse. All that remains is the flattish segments, which just will rust and collapses a few years later.