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Public-images-osm logo.svg tunnel = culvert
For a stream/drain/ditch passing under a road. Use it on the section of waterway passing under the road. Edit or translate this description.
Group: Waterways
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations
Useful combination
Status: de facto

Some culverts may be large, this is an entrance to culvert over one kilometer long
Culvert large enough to contain river rather than drain or stream

A culvert is a device used to channel water. It may be used to allow water to pass underneath a road, railway, or embankment for example. Culverts can be made of many different materials; steel, polyvinyl chloride (PVC) and concrete are the most common. Formerly, construction of stone culverts was common.

Commonly used with waterway=stream, waterway=drain, waterway=ditch.

But there are also large culvert fitting waterway=river.

You may use tunnel=flooded to map larger and longer tunnels used to channelise any fluid.

Typical culvert is a pipe buried under the road. Very large culverts may be hard to distinguish from bridges.

How to Map

Apply to the section of covered waterway. Use the tag layer=* as usual for tunnels.

See tunnel=* for a description of the preferred way of connecting culvert waterways to adjoining waterway sections.

Possible tagging mistakes

  • culvert=yes ‒ The culvert=yes syntax is deprecated (since 2010) due to ambiguity.[1] Please use tunnel=culvert instead. (While technically sound there is no use of culvert=no as of April, 2015, so avoid it altogether.)
If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!

See also


  1. See the seemingly endless debate over the mailing list