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      "observations": [
        {
          "artifact_refs": [],
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          "content": "The Forest Service Recreation Opportunities service publishes named point records for Convict Lake Loop Trailhead (recreation area 21340) and Hilton Lakes Trailhead (recreation area 83267).",
          "observation_id": "observation-usfs-eastern-sierra-trailhead-points-20260925",
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          "publisher": "USDA Forest Service",
          "source_id": "source-usfs-recreation-opportunities-eastern-sierra-20260925"
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      ]
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        "claim_id": "claim-trailhead-horseshoe-lake-mammoth-map-point",
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        "predicate": "reviewed_access_point_coordinate",
        "spatial_scope_ids": [],
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        {
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          "content": "The Forest Service Recreation Opportunities service publishes Mammoth Pass Trailhead, recreation area 20494, at Horseshoe Lake.",
          "observation_id": "observation-usfs-mammoth-pass-trailhead-point-20260925",
          "observed_at": null,
          "observer": "",
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          "source_id": "source-usfs-recreation-opportunities-eastern-sierra-20260925"
        }
      ]
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  ],
  "entities": [
    {
      "entity_id": "trailhead-convict-lake",
      "kind": "trailhead",
      "name": "Convict Lake Trailhead"
    },
    {
      "entity_id": "trailhead-hilton-lakes-rock-creek",
      "kind": "trailhead",
      "name": "Hilton Lakes Trailhead at Rock Creek Lake"
    },
    {
      "entity_id": "trailhead-horseshoe-lake-mammoth",
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      "name": "Horseshoe Lake Trailhead"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260925-eastern-sierra-trailhead-map-points",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-usfs-recreation-opportunities-eastern-sierra-20260925.json",
      "reason": "Publish reviewed East Side access points without inferring access from proximity.",
      "record_id": "source-usfs-recreation-opportunities-eastern-sierra-20260925",
      "record_type": "source",
      "summary": "Publish 13 evidenced East Side trail access points and preserve three unresolved connector or identity questions."
    }
  ],
  "navigation": {
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    "position": 566,
    "previous_id": "source-usfs-pine-grove-rock-creek",
    "total": 587
  },
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    {
      "artifact_refs": [],
      "content": "The live Forest Service Recreation Opportunities record marks Convict Lake Loop Trailhead open. The Hilton Lakes and Mammoth Pass trailhead records do not publish an open-status value.",
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      "content": "The Forest Service Recreation Opportunities service publishes named point records for Convict Lake Loop Trailhead (recreation area 21340) and Hilton Lakes Trailhead (recreation area 83267).",
      "observation_id": "observation-usfs-eastern-sierra-trailhead-points-20260925",
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      "content": "The Forest Service Recreation Opportunities service publishes Mammoth Pass Trailhead, recreation area 20494, at Horseshoe Lake.",
      "observation_id": "observation-usfs-mammoth-pass-trailhead-point-20260925",
      "observed_at": null,
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      "retrieved_at": "2026-09-25T19:00:00+00:00",
      "source_id": "source-usfs-recreation-opportunities-eastern-sierra-20260925"
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    "publisher": "USDA Forest Service",
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      "locator": "https://apps.fs.usda.gov/arcx/rest/services/EDW/EDW_RecreationOpportunities_01/MapServer/0",
      "publisher": "USDA Forest Service",
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}