{
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    {
      "claim": {
        "claim_id": "claim-emigrant-crabtree-bear-spur",
        "evidence_ids": [
          "evidence-emigrant-crabtree-bear-spur"
        ],
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        "spatial_scope_ids": [
          "scope-route-segment-emigrant-crabtree-bear-spur"
        ],
        "subject_id": "route-segment-emigrant-crabtree-bear-spur",
        "temporal_scope": null,
        "value": {
          "distance_miles": 1.0,
          "distance_status": "estimated",
          "end_node_id": "route-node-emigrant-bear-trail-end",
          "precision_note": "Mapped connectivity; no surveyed coordinates. Schematic distance is an estimate, not navigation.",
          "route_role": "official_mainline",
          "start_node_id": "route-node-emigrant-bear-junction"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-emigrant-crabtree-bear-spur",
          "evidence_id": "evidence-emigrant-crabtree-bear-spur",
          "notes": "",
          "observation_id": "observation-emigrant-crabtree-bear-spur",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "Emigrant Trail Mileage Diagram (2021 filename), western panel: branch from the junction by Camp Lake to Bear Lake is labeled 1.0. Source explicitly calls distances estimates. The schematic endpoint is Bear Lake; detailed endpoint support is retained separately in the Bear map identity evidence.",
          "observation_id": "observation-emigrant-crabtree-bear-spur",
          "observed_at": null,
          "observer": "Wayproof primary-source text and visual map review",
          "retrieved_at": "2026-10-05T22:52:54+00:00",
          "source_id": "source-usfs-emigrant-mileage-diagram"
        }
      ],
      "sources": [
        {
          "locator": "https://www.fs.usda.gov/sites/nfs/files/legacy-media/stanislaus/Emigrant%20Trail%20Mileage%20Diagram%202021.pdf",
          "publisher": "USDA Forest Service, Stanislaus National Forest",
          "source_id": "source-usfs-emigrant-mileage-diagram"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-emigrant-crabtree-schematic-crabtree-junction",
        "evidence_ids": [
          "evidence-emigrant-crabtree-schematic-crabtree-junction"
        ],
        "predicate": "published_schematic_distance_report",
        "spatial_scope_ids": [
          "scope-route-emigrant-crabtree-camp-lake",
          "scope-route-emigrant-crabtree-bear-lake"
        ],
        "subject_id": "route-node-emigrant-pine-valley-junction",
        "temporal_scope": null,
        "value": {
          "endpoint": "first drawn south-side junction; Pine Valley connection on overview",
          "not_atomic_distance": true,
          "omitted_branch": "Lake Valley",
          "qualifier": "estimate",
          "reported_miles": 1.3
        }
      },
      "evidence": [
        {
          "claim_id": "claim-emigrant-crabtree-schematic-crabtree-junction",
          "evidence_id": "evidence-emigrant-crabtree-schematic-crabtree-junction",
          "notes": "",
          "observation_id": "observation-emigrant-crabtree-schematic-crabtree-junction",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "Emigrant Trail Mileage Diagram (2021 filename), western panel: Crabtree to the first drawn south-side junction is labeled 1.3. Lake Valley branch is omitted. Diagram calls mileages estimates, straightens trail segments and disclaims navigation/scale.",
          "observation_id": "observation-emigrant-crabtree-schematic-crabtree-junction",
          "observed_at": null,
          "observer": "Wayproof primary-source text and visual map review",
          "retrieved_at": "2026-10-05T22:52:54+00:00",
          "source_id": "source-usfs-emigrant-mileage-diagram"
        }
      ],
      "sources": [
        {
          "locator": "https://www.fs.usda.gov/sites/nfs/files/legacy-media/stanislaus/Emigrant%20Trail%20Mileage%20Diagram%202021.pdf",
          "publisher": "USDA Forest Service, Stanislaus National Forest",
          "source_id": "source-usfs-emigrant-mileage-diagram"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-emigrant-western-powell-mileage-diagram",
        "evidence_ids": [
          "evidence-emigrant-western-powell-mileage-diagram"
        ],
        "predicate": "published_approach_distance_report",
        "spatial_scope_ids": [
          "scope-route-emigrant-gianelli-powell-lake"
        ],
        "subject_id": "route-emigrant-gianelli-powell-lake",
        "temporal_scope": null,
        "value": {
          "not_atomic_distance": true,
          "qualifier": "estimate",
          "reported_one_way_miles": 2.0,
          "source_edition": "2021 filename"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-emigrant-western-powell-mileage-diagram",
          "evidence_id": "evidence-emigrant-western-powell-mileage-diagram",
          "notes": "",
          "observation_id": "observation-emigrant-western-powell-mileage-diagram",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "Official mileage-diagram gives Gianelli–Powell Lake as 2.0 miles; edition 2021 filename. The 2018 guide describes Powell as one mile beyond Burst Rock; schematic estimates do not identify every graph vertex.",
          "observation_id": "observation-emigrant-western-powell-mileage-diagram",
          "observed_at": null,
          "observer": "Wayproof primary-source text, georeferenced map and named-feature review",
          "retrieved_at": "2026-10-06T07:44:34+00:00",
          "source_id": "source-usfs-emigrant-mileage-diagram"
        }
      ],
      "sources": [
        {
          "locator": "https://www.fs.usda.gov/sites/nfs/files/legacy-media/stanislaus/Emigrant%20Trail%20Mileage%20Diagram%202021.pdf",
          "publisher": "USDA Forest Service, Stanislaus National Forest",
          "source_id": "source-usfs-emigrant-mileage-diagram"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "route-emigrant-gianelli-powell-lake",
      "kind": "route",
      "name": "Gianelli to Powell Lake"
    },
    {
      "entity_id": "route-node-emigrant-pine-valley-junction",
      "kind": "route_node",
      "name": "Pine Valley Trail junction on Camp Lake approach"
    },
    {
      "entity_id": "route-segment-emigrant-crabtree-bear-spur",
      "kind": "route_segment",
      "name": "Bear Spur"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20261005-emigrant-crabtree-lakes",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-usfs-emigrant-mileage-diagram.json",
      "reason": "Add bounded Crabtree lake approaches while preserving map precision and unresolved coverage.",
      "record_id": "source-usfs-emigrant-mileage-diagram",
      "record_type": "source",
      "summary": "Model shared Crabtree approaches to Camp and Bear lakes with conflicting mileage reports and lake camping rechecks."
    }
  ],
  "navigation": {
    "next_id": "source-usfs-emigrant-mileage-table",
    "position": 536,
    "previous_id": "source-usfs-emigrant-horse-camping-2020",
    "total": 587
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "Emigrant Trail Mileage Diagram (2021 filename), western panel: branch from the junction by Camp Lake to Bear Lake is labeled 1.0. Source explicitly calls distances estimates. The schematic endpoint is Bear Lake; detailed endpoint support is retained separately in the Bear map identity evidence.",
      "observation_id": "observation-emigrant-crabtree-bear-spur",
      "observed_at": null,
      "observer": "Wayproof primary-source text and visual map review",
      "retrieved_at": "2026-10-05T22:52:54+00:00",
      "source_id": "source-usfs-emigrant-mileage-diagram"
    },
    {
      "artifact_refs": [],
      "content": "Emigrant Trail Mileage Diagram (2021 filename), western panel: Crabtree to the first drawn south-side junction is labeled 1.3. Lake Valley branch is omitted. Diagram calls mileages estimates, straightens trail segments and disclaims navigation/scale.",
      "observation_id": "observation-emigrant-crabtree-schematic-crabtree-junction",
      "observed_at": null,
      "observer": "Wayproof primary-source text and visual map review",
      "retrieved_at": "2026-10-05T22:52:54+00:00",
      "source_id": "source-usfs-emigrant-mileage-diagram"
    },
    {
      "artifact_refs": [],
      "content": "Official mileage-diagram gives Gianelli–Powell Lake as 2.0 miles; edition 2021 filename. The 2018 guide describes Powell as one mile beyond Burst Rock; schematic estimates do not identify every graph vertex.",
      "observation_id": "observation-emigrant-western-powell-mileage-diagram",
      "observed_at": null,
      "observer": "Wayproof primary-source text, georeferenced map and named-feature review",
      "retrieved_at": "2026-10-06T07:44:34+00:00",
      "source_id": "source-usfs-emigrant-mileage-diagram"
    }
  ],
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    "locator": "https://www.fs.usda.gov/sites/nfs/files/legacy-media/stanislaus/Emigrant%20Trail%20Mileage%20Diagram%202021.pdf",
    "publisher": "USDA Forest Service, Stanislaus National Forest",
    "source_id": "source-usfs-emigrant-mileage-diagram"
  },
  "record_type": "source",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.fs.usda.gov/sites/nfs/files/legacy-media/stanislaus/Emigrant%20Trail%20Mileage%20Diagram%202021.pdf",
      "publisher": "USDA Forest Service, Stanislaus National Forest",
      "source_id": "source-usfs-emigrant-mileage-diagram"
    }
  ]
}