Michigan's drawbridges run on clockwork: Charlevoix on the hour and half-hour, Bay City's four bridges interleaved so one opens every 15 minutes, Portage Lake locked down all winter. Every movable bridge, with its federal schedule — tap any bridge for the rule.
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App Store Google PlayHow it works: opening schedules come from the US Coast Guard’s Drawbridge Operation Regulations (33 CFR Part 117) — Michigan’s bridges run on unusually regular clocks, which makes the schedule almost as good as live status. A few one-time drawbridges no longer open (Zilwaukee has been a fixed high-rise since 1988). Also see Seattle, Washington, Oregon, Florida, Louisiana, New Jersey, and North Carolina.
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