Each feature class or feature dataset is in Geographic (GCS) NAD83 unless otherwise noted
This dataset contains flowline features from the
US Geologic Survey (USGS) High Resolution National Hydrography Dataset (NHD).
NHD Flowline features are linear depictions of streams and centerlines of
rivers. Additional attributes have been added from the Bureau of Land
Management (BLM) hydrography event data.
This dataset will be refreshed as-needed to
reflect updates to the NHD and hydrography events.
This publication format is intended to improve the usability of the High Resolution NHD and Bureau of Land Management (BLM) hydrography event data by combining attributes from both sources into one dataset with a simplified structure. The publication format includes the most commonly used attribute information. Other less commonly used attributes are available directly from the Bureau of Land Management (BLM) hydrography event data system.