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    • Database of modified routing for NHDPlus version 2.1 flowlines: ENHDPlusV2_us

    Metadata Updated: January 20, 2026

    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. Each segment of the flowline network is referenced with the unique identifier COMID. The dataset also contains attributes that identify the immediate upstream (Hydroseq and cfromnode) and downstream (ctonode) COMID in the modified flowline network. The network connectivity for flowlines ranging from headwaters to the most downstream flowline allows for the routing and aggregating of information assigned to the network. The resulting enhanced network, available in a single data file for the entire conterminous U.S., has the designation ENHDPlusV2_us.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date January 11, 2026
    Metadata Updated Date January 20, 2026

    Metadata Source

    Harvested from DOI USGS DCAT-US

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date January 11, 2026
    Metadata Updated Date January 20, 2026
    Publisher U.S. Geological Survey
    Maintainer
    Identifier http://datainventory.doi.gov/id/dataset/USGS_5b92790be4b0702d0e809fe5
    Data Last Modified 2020-08-26T00:00:00Z
    Category geospatial
    Public Access Level public
    Bureau Code 010:12
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://ddi.doi.gov/usgs-data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Datagov Dedupe Retained 20260120094633
    Harvest Object Id 6b43d2db-3891-4918-9638-3acc7caa55dc
    Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
    Harvest Source Title DOI USGS DCAT-US
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": -126.0352, 24.2069, -126.0352, 49.3824, -65.7422, 49.3824, -65.7422, 24.2069, -126.0352, 24.2069}
    Source Datajson Identifier True
    Source Hash 3e11868300d8ec977611c46e81e302d6aeb450c6f097f86086e0457331320f1b
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -126.0352, 24.2069, -126.0352, 49.3824, -65.7422, 49.3824, -65.7422, 24.2069, -126.0352, 24.2069}

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