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Database of modified routing for NHDPlus version 2.1 flowlines: ENHDPlusV2_us


Publication Date
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Schwarz, G.E., and Wieczorek, M.E., 2018, Database of modified routing for NHDPlus version 2.1 flowlines: ENHDPlusV2_us: U.S. Geological Survey data release,


This database (ENHDPlusV2_us) contains a topologically reconditioned (enhanced) version of the U.S. Environmental Protection Agency (USEPA) and the U.S. Geological Survey (USGS) NHDPlus Version 2.1 (NHDPlusV2) flowline network. The comma separated file included in this release contains routing and stream connection information, with the intention of improving accuracy and networking capabilities. The enhancements described here include corrections to inconsistencies in network and routing information, filling-in missing attribute values of associated characteristics, and revisions to diverted flow routing. The database is intended for routing purposes only; no cartographic changes were made to the original NHDPlusv2 flowline line work. [...]


Point of Contact :
Gregory E Schwarz
Originator :
Gregory E Schwarz, Michael E Wieczorek
Metadata Contact :
Michael E Wieczorek
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Office of Planning and Programming
USGS Mission Area :
Water Resources

Attached Files

Click on title to download individual files attached to this item.

“File of all modified flowlines”
48.59 KB text/plain
“Routing database”
153 MB application/zip
“Table item descriptions”
73.07 KB application/vnd.openxmlformats-officedocument.spreadsheetml.sheet


This database was created by the U.S. Geological Survey's (USGS) National Water-Quality Assessment (NAWQA) Project specifically for routing purposes to support modeling efforts and for estimating watershed characteristics throughout the network.



  • USGS Data Release Products



Additional Information


Type Scheme Key
DOI doi:10.5066/P9PA63SM

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