{
  "title": "Barge #1",
  "era": "Original rail-ferry service, c.1895–1910",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 310,
    "beamFeet": 44,
    "depthOfHoldFeet": 12,
    "lengthCaveat": "Rounded documented baseline",
    "hullHeightInferred": true
  },
  "geometryReference": {
    "hullBowX": -47.244,
    "hullSternX": 47.244,
    "deckY": 3.85,
    "waterlineY": 2.75,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -47.27525402056006,
      0.12,
      -6.7806000000000015
    ],
    "max": [
      47.250276021309965,
      10.05,
      6.7806000000000015
    ]
  },
  "triangleCount": 81008,
  "trianglesByGroup": {
    "hull": 10980,
    "bulwarks": 9736,
    "deck": 11632,
    "fittings": 1672,
    "side_girders": 1164,
    "rail_tracks": 7632,
    "railcars": 32208,
    "deckhouses": 816,
    "machinery": 5012,
    "steering": 156
  },
  "drawCalls": 33,
  "mastCount": 0,
  "supportsSails": false,
  "visibilityNodes": {
    "railcars": "railcars"
  },
  "deployedSailCount": 0,
  "propulsionMode": "Unpowered barge",
  "inferredFeatures": [
    "Hull lines, draft, colors and small fittings",
    "Deck layout and machinery proportions",
    "Example railcars/stores are illustrative, not a historical loading manifest"
  ],
  "configurationCaveat": "Original four-track rail-ferry form, before conversion to bulk cargo service. Twelve example period freight cars illustrate operation; they are not a documented load. No propulsion engine or propeller. A small auxiliary steam plant operated deck machinery.",
  "sources": [
    {
      "title": "NOAA Thunder Bay National Marine Sanctuary: Barge #1",
      "url": "https://thunderbay.noaa.gov/shipwrecks/barge-one.html",
      "use": "Vessel type, scale baseline, dates and wreck evidence"
    },
    {
      "title": "UASC archaeological survey of Car Ferry No. 2, February 2016",
      "url": "https://uaschicago.org/index.php/publications/reports/file/Car%20Ferry%20Project%20Report.pdf",
      "use": "Photo of No. 1 p.32; sister-vessel analogy and construction details pp.18,32–35"
    },
    {
      "title": "NOAA sanctuary boundary expansion assessment, 2014",
      "url": "https://nmssanctuaries.blob.core.windows.net/sanctuaries-prod/media/archive/library/pdfs/tb-eis-expansion2014.pdf",
      "use": "Four tracks and 28-railcar capacity, p.33"
    }
  ],
  "revisedDate": "2026-09-08",
  "revisionNote": "Added sourced documentary features and repaired metadata and research-note formatting; this collection cleanup is not a new full historical or geometry audit.",
  "documentedFeatures": [
    "Wooden car-ferry barge built by James Davidson at West Bay City in 1895. [NOAA Thunder Bay National Marine Sanctuary: Barge #1](https://thunderbay.noaa.gov/shipwrecks/barge-one.html)",
    "NOAA wreck dimensions 309×44 ft; the model uses the survey’s rounded 310 ft baseline. [NOAA Thunder Bay National Marine Sanctuary: Barge #1](https://thunderbay.noaa.gov/shipwrecks/barge-one.html)"
  ]
}