bridge=culvert? What is the intended meaning of this tag?
I am aware about tunnel=culvert for water piped under road (usually streams/drains) - see https://wiki.openstreetmap.org/wiki/Tag%3Atunnel%3Dculvert
You make a good point.
"culvert" was one of the type options provided by iD (Map editor).
I have changed it to bridge=low water crossing
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