Horizon SystemsNHDPlus Version 1 (Archive)Data
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NHDPlus Version 1 Tools
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.

Region Map