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|Identifier of object in National Hydrography Dataset|
|Used on these elements|
|Tools for this tag|
Meaning and usefulness of this key is unclear. National Hydrography Dataset documentation page sadly is missing this info.
Described as "Common identifier of an NHD feature or relationship" in https://www.fs.fed.us/rm/boise/AWAE/projects/stream_temp/multregression/downloads/3_N_NHDPlusAttributes.pdf
Relation to reach code nhd:reach_code=* is unclear, but it appears that single NHD feature consists of one and more reaches.
- Review of original version of this page by tagging mailing list
- proposal to automatically remove this tag without user review (making it discardable): https://github.com/openstreetmap/id-tagging-schema/pull/235