How to tag road crossing river that is not bridge or ford?

I often see points where road goes over the narrow water object (stream or creek) where one or more pipes are placed (usually made of concrete) and then covered with earth or cobblestones.

Neither bridge or ford seems to fit that. How to tag?

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I think you’re looking for a tunnel=culvert on the water object.

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And also set “layer=-1” on the tunnel.

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That should do. Thanks