Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted.  For more information, please see www.doi.gov/shutdown

NGP Standards and Specifications

Hydrography Standards and Specifications

The National Map serves surface water hydrography data for the United States in several different datasets, including the National Hydrography Dataset (NHD) High Resolution, the Watershed Boundary Dataset (WBD), and the NHDPlus High Resolution (NHDPlus HR).  

Links to specifications tools and information can be found on this page. 

BETA - Spec-X

BETA - Spec-X

Spec-X is a guide for exploring The National Map Specifications. *BETA Release*

Spec-X BETA

NHD User Guide and Feature Catalog

NHD User Guide and Feature Catalog

The NHD User Guide contains Interactive tutorials, a feature catalog, and the NHD Video Library.

NHD Feature Catalog