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Mainstem Rivers of the Conterminous United States (ver. 2.0, February 2023)


Publication Date


Blodgett, D.L., 2023, Mainstem Rivers of the Conterminous United States (ver. 2.0, February 2023): U.S. Geological Survey data release,


Mainstem rivers are the backbone of a connected network of hydrologic units that cover the landscape. A mainstem connects a headwater source area to an outlet. This data release identifies the same mainstem paths in hydrographic datasets for the conterminous US. The Mainstems dataset includes cross walks between mainstem identifiers and several hydrographic datasets. These cross walk tables do not include geometry. It also includes a summary of all mainstems with headwater and outlet identifiers from other datasets for those mainstems that could be matched. The summary table has highly simplified geometry and should be used for visualization purposes only. Any analysis should rely on source dataset geometry. As a convenience, a geodatabase [...]


Point of Contact :
David L Blodgett
Originator :
David L Blodgett
Metadata Contact :
David L Blodgett
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Integrated Modeling & Prediction Division
USGS Mission Area :
Water Resources

Attached Files

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mainstems_version_history.txt 1.23 KB text/plain
rf1.csv 782.4 KB text/csv
nhdplusv2wbd.csv 6.93 MB text/csv
102020wbd.csv 6.97 MB text/csv
mainstems_summary_v2.gpkg 306.35 MB application/unknown
nhdplusv1.csv 451.57 MB text/csv
102020wbd_outlets.gpkg 11.77 MB application/unknown
nhdplusv2wbd_outlets.gpkg 11.64 MB application/unknown 2.74 GB application/zip


Persistent, cross-scale, identification of hydrologic features, network navigation, and hydrologic indexing (hydrographic addressing). The cross-walk tables in the dataset relate the RF1, NHDPlusV1, NHDPlusV2, Watershed Boundary Dataset snapshot from NHDPlusV2, and Watershed Boundary Dataset from June 2021.



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Associated Items



Revision 2.0 by Dave Blodgett on February 1, 2023. To review the changes that were made, see “mainstems_version_history.txt” in the attached files section. Changes in version 2.0: 1) A bug in a data procesing workflow was fixed. Changes are documented: Blodgett, D.L., 2022, Updated CONUS river network attributes based on the E2NHDPlusV2 and NWMv2.1 networks (version 2.0, December 2022): U.S. Geological Survey data release, Levelpath identifiers were recalculated in the source dataset and are not compatible with version 1. 2) Workflows that leveraged the identifiers in version 1 of this data release should switch to this updated version at their earliest convenience. Reach out to if support if required.

Additional Information


Type Scheme Key
DOI doi:10.5066/P92U7ZUT

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