The HydroLink App is no longer supported. We recommend exploring the Hydrography Addressing Tool or related Python Hydrolink methods to meet your hydrolink needs.
The HydroLink Tool aids in generating a linear reference for point data to the NHDPlusV2.1 Medium Resolution and NHD High Resolution hydrography layers. The tool employs the researcher’s local, field-based knowledge of the geospatial features where data were collected to improve both the spatial accuracy of the research data and assist in the linkage to these national surface water datasets.
Once the point location data are verified and linear referencing is complete, the output dataset includes the verified latitude and longitude coordinates and additional attributes to document the linkage to the hydrography datasets. The dataset can then be exported as a shapefile (SHP) from the tool, or exported in multiple formats through ArcGIS Online [e.g. comma separated values (CSV), file geodatabase (FGDB), and GeoJSON], or published as a web service (e.g. map services with WMS enabled).
To get started we recommend using the video "Introduction to the USGS Hydrolink Tool" (see external sources below).
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“Schema of Data Fields added to HydroLinked Data”