re: Is there a law mandating a drawbridge opens every 30min?

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Drawbridges seem like architectural short sightedness. The long term costs of maintenance, operation, etc have to exceed the long term convenience of just building a slightly more elevated permanent structure.

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Hwy 11 across the lake has been closed for like 3-4 years for them to repair the draw bridges. They could have torn it down and built a new elevated bridge in less time.