National Map Specifications on Spec-X
URL: https://usgs-mrs.cr.usgs.gov/SPECX/treeview/index
You can explore the data dictionaries and specifications for the NHD on USGS' Spec-X website. Spec-X is a guide for exploring information about The National Map data products, including information about the symbols and labels used on US Topo maps, data dictionaries for the different map layers created by The National Map, and much more. Begin exploring the information behind the maps by selecting the tabs above for queries, reports, and more.
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Additional Information
| Field | Value |
|---|---|
| Data last updated | August 8, 2022 |
| Metadata last updated | November 19, 2025 |
| Created | August 8, 2022 |
| Format | website |
| License | License not specified |
| Datastore active | False |
| Has views | False |
| Id | b9ec3604-b58c-4113-8f14-c5c74c383473 |
| Package id | 0d156b05-0d71-4520-85a1-6684a588a3d6 |
| Position | 9 |
| State | active |