{
  "title": "Steel Barge",
  "era": "Wreck-plan-guided working interpretation",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 60,
    "beamFeet": 30,
    "depthOfHoldFeet": null,
    "beamInferred": false,
    "holdDepthUnknown": true,
    "dimensionsSourceQuality": "Selected documentary baseline; see vessel research notes for length and beam conflicts"
  },
  "geometryReference": {
    "hullBowX": -9.144,
    "hullSternX": 9.144,
    "deckY": 1.9,
    "waterlineY": 1.05,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -9.19332697529265,
      0.0050000000000000044,
      -4.632000000000001
    ],
    "max": [
      9.183160934234742,
      4.06,
      4.632000000000001
    ]
  },
  "triangleCount": 17876,
  "trianglesByGroup": {
    "hull": 13006,
    "deck": 226,
    "plating": 180,
    "pilothouse": 192,
    "cleats": 512,
    "cargo_hatches": 36,
    "hatch_covers": 108,
    "rubbing_rails": 3616
  },
  "drawCalls": 15,
  "mastCount": 0,
  "supportsSails": false,
  "visibilityNodes": {
    "hatches": "hatch_covers"
  },
  "deployedSailCount": 0,
  "inferredFeatures": [
    "Underwater hull lines and draft",
    "Exact colors, fittings, hatch layout and rigging routes"
  ],
  "configurationCaveat": "NOAA’s site plan and photos guide the rectangular deck, aft pilothouse, hatches and cleats. Identity, build and loss dates, original paint and propulsion are unknown. No engine, crane or carbide cargo is invented; the site plan gives a 31-foot beam versus 30 in the catalogue.",
  "sources": [
    {
      "title": "NOAA vessel record",
      "url": "https://thunderbay.noaa.gov/shipwrecks/steelbarge.html",
      "use": "Identity, dimensions, history and surviving evidence"
    },
    {
      "title": "NOAA Steel Barge site plan",
      "url": "https://thunderbay.noaa.gov/media/img/20200930-steel-barge-siteplan-1000.jpg",
      "use": "Inspected plan by W.F. Lusardi, 2006; deck layout and alternate beam"
    },
    {
      "title": "NOAA Steel Barge pilothouse photo",
      "url": "https://thunderbay.noaa.gov/media/img/20200930-steel-barge-1-1000.jpg",
      "use": "Inspected surviving aft cabin form and openings"
    }
  ],
  "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": [
    "NOAA identifies a steel deck barge with an aft pilothouse. [NOAA vessel record](https://thunderbay.noaa.gov/shipwrecks/steelbarge.html)",
    "Catalogue dimensions 60×30 ft differ from the site plan’s 31 ft beam. [NOAA vessel record](https://thunderbay.noaa.gov/shipwrecks/steelbarge.html)"
  ]
}