{
  "id": "water-journey",
  "version": "nhdplusv2-curated20261004",
  "sourceUrls": [
    "https://api.water.usgs.gov/docs/nldi/navigation/",
    "https://www.epa.gov/waterdata/nhdplus-national-hydrography-dataset-plus",
    "https://www.usgs.gov/centers/sawsc/science/apalachicola-chattahoochee-flint-acf-river-national-water-quality-assessment",
    "https://pubs.usgs.gov/publication/wsp350"
  ],
  "retrievedAt": "2026-10-04T00:00:00Z",
  "licenseReference": "https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits",
  "commercialStatus": "approved",
  "exportStatus": "approved",
  "bounds": [
    -113,
    29,
    -83,
    42
  ],
  "time": {
    "kind": "snapshot",
    "epochs": [
      2026
    ],
    "unit": "year"
  },
  "units": {
    "distance": "km, source NHDPlusV2 LENGTHKM",
    "time": "illustrative progress only"
  },
  "limitations": [
    "HydroRIVERS was replaced with the rights-clear USGS / EPA NHDPlusV2 source because HydroSHEDS v1 has protective end-user license and stand-alone redistribution conditions.",
    "Only the curated ACF river paths and Bear River near Corinne are available. Reverse mode shows included upstream reaches, not a complete watershed.",
    "Starting choices are complete mapped reaches containing the named gage, not the exact gage position. Arbitrary map clicks are not routed.",
    "Edges follow source HYDROSEQ / DNHYDROSEQ identifiers and NLDI downstream mainstem paths. Diversions, groundwater, floods and unmapped tributaries are excluded.",
    "Animation progress and arrival times are illustrative; no hydrologic speed or forecast is calculated.",
    "The 2026 epoch labels this archived catalog, not a dated observation of river flow. Underlying source geometry dates are retained per reach.",
    "Mapped terminal flags identify network endpoints. Curated official USGS evidence classifies Apalachicola as an ocean outlet and Bear River as an inland Great Salt Lake terminal."
  ],
  "assets": [
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      "url": "https://api.water.usgs.gov/nldi/linked-data/nwissite/USGS-10126000/navigation/DM/flowlines?f=json&distance=1000",
      "release": "NLDI NHDPlusV2 response, archived October 4, 2026",
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  "attribution": "USGS / EPA NHDPlusV2 official regional source releases and USGS NLDI geometry, archived October 4, 2026. Derived route catalog and animation by MapifyStats."
}