{
  "title": "Michael Groh",
  "era": "Original c.1867 lumber steamer, before enlargement",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 120.4,
    "beamFeet": 23.8,
    "depthOfHoldFeet": 8.6,
    "beamAndDepthInferred": false
  },
  "geometryReference": {
    "hullBowX": -18.34896,
    "hullSternX": 18.34896,
    "deckY": 2.9,
    "waterlineY": 2.05,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -21.125026270312873,
      0.0050000000000000044,
      -3.7121200000000005
    ],
    "max": [
      18.41674849709964,
      21.522375835940547,
      3.7121200000000005
    ]
  },
  "triangleCount": 42916,
  "trianglesByGroup": {
    "hull": 12668,
    "bulwarks": 9236,
    "fittings": 2820,
    "deck": 5560,
    "propulsion": 208,
    "anchors": 636,
    "deckhouses": 1872,
    "pilothouse": 708,
    "cargo_hatches": 120,
    "hatch_covers": 264,
    "deck_cargo": 3936,
    "machinery": 560,
    "ship_boat": 1816,
    "spars": 1384,
    "standing_rigging": 1128
  },
  "drawCalls": 56,
  "mastCount": 2,
  "supportsSails": false,
  "visibilityNodes": {
    "cargo": "deck_cargo"
  },
  "deployedSailCount": 0,
  "inferredFeatures": [
    "Underwater hull lines and draft",
    "Exact colors, fittings, hatch layout and rigging routes"
  ],
  "configurationCaveat": "Original 120.4 ft form with aft cabins, not the 141.5 ft enlarged vessel lost in 1895. The second working mast, wheelhouse proportions, deck lumber and fittings are interpreted.",
  "sources": [
    {
      "title": "Labadie, NPS Submerged Cultural Resources Study: Pictured Rocks National Lakeshore (1989)",
      "url": "https://www.npshistory.com/series/archeology/scrc/22/report.pdf",
      "use": "Printed pp.62–66: original enrollment, stern cabins and later enlargement"
    }
  ],
  "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": [
    "The original 1867 enrollment gives 120.4×23.8×8.6 ft, 174.15 gross tons and US17572. [Labadie, NPS Submerged Cultural Resources Study: Pictured Rocks National Lakeshore (1989)](https://www.npshistory.com/series/archeology/scrc/22/report.pdf)",
    "Built by Quayle and Martin before a substantial 1881–82 rebuild. [Labadie, NPS Submerged Cultural Resources Study: Pictured Rocks National Lakeshore (1989)](https://www.npshistory.com/series/archeology/scrc/22/report.pdf)"
  ]
}