Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
NHDPlus Version 1 Documentation
Select the data region of your choice by clicking on the map below or selecting the name from the list.
Note: The unusual map edge appearance is due to the use of the USGS quad map edges. The map extent shows the extent of the available quad maps.
