{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-lassen-hydrothermal-safety",
        "evidence_ids": [
          "evidence-lassen-hydrothermal-safety"
        ],
        "predicate": "hydrothermal_area_safety",
        "spatial_scope_ids": [
          "scope-lassen-national-park"
        ],
        "subject_id": "park-lassen-volcanic-national-park",
        "temporal_scope": null,
        "value": {
          "do_not_touch_or_enter_hydrothermal_water": true,
          "off_trail_travel_unlawful": true,
          "stay_on_established_trails_or_boardwalks": true
        }
      },
      "evidence": [
        {
          "claim_id": "claim-lassen-hydrothermal-safety",
          "evidence_id": "evidence-lassen-hydrothermal-safety",
          "notes": "",
          "observation_id": "observation-nps-lassen-hydrothermal-20260923",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "NPS identifies Bumpass Hell, Sulphur Works, Devils Kitchen, Boiling Springs Lake, and Terminal Geyser as hydrothermal destinations and requires visitors to remain on established trails or boardwalks.",
          "observation_id": "observation-nps-lassen-hydrothermal-20260923",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-23T03:30:00+00:00",
          "source_id": "source-nps-lassen-hydrothermal"
        }
      ],
      "sources": [
        {
          "locator": "https://www.nps.gov/lavo/planyourvisit/exploring-the-hydrothermal-areas.htm",
          "publisher": "National Park Service",
          "source_id": "source-nps-lassen-hydrothermal"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-sulphur-works-access",
        "evidence_ids": [
          "evidence-sulphur-works-access"
        ],
        "predicate": "published_access",
        "spatial_scope_ids": [
          "scope-hydrothermal-area-sulphur-works"
        ],
        "subject_id": "hydrothermal-area-sulphur-works",
        "temporal_scope": null,
        "value": {
          "location": "one mile north of Southwest Entrance",
          "mode": "sidewalk",
          "parking": "adjacent parking area"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-sulphur-works-access",
          "evidence_id": "evidence-sulphur-works-access",
          "notes": "",
          "observation_id": "observation-nps-lassen-hydrothermal-20260923",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "NPS identifies Bumpass Hell, Sulphur Works, Devils Kitchen, Boiling Springs Lake, and Terminal Geyser as hydrothermal destinations and requires visitors to remain on established trails or boardwalks.",
          "observation_id": "observation-nps-lassen-hydrothermal-20260923",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-23T03:30:00+00:00",
          "source_id": "source-nps-lassen-hydrothermal"
        }
      ],
      "sources": [
        {
          "locator": "https://www.nps.gov/lavo/planyourvisit/exploring-the-hydrothermal-areas.htm",
          "publisher": "National Park Service",
          "source_id": "source-nps-lassen-hydrothermal"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "hydrothermal-area-sulphur-works",
      "kind": "hydrothermal_area",
      "name": "Sulphur Works"
    },
    {
      "entity_id": "park-lassen-volcanic-national-park",
      "kind": "national_park",
      "name": "Lassen Volcanic National Park"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260923-lassen-destinations-route-depth",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-nps-lassen-hydrothermal-20260923.json",
      "reason": "Publish official-source Lassen destination identities, named hiking routes, evidenced starts, route profiles, and route-condition rechecks without inventing segment topology.",
      "record_id": "observation-nps-lassen-hydrothermal-20260923",
      "record_type": "observation",
      "summary": "Add official-source Lassen destinations, named hiking routes, evidenced trailheads, route profiles, and route-condition rechecks while preserving the remaining segment-topology gap."
    }
  ],
  "navigation": {
    "next_id": "observation-nps-lassen-peak-trail-20260923",
    "position": 862,
    "previous_id": "observation-nps-lassen-getting-around-20260922",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "NPS identifies Bumpass Hell, Sulphur Works, Devils Kitchen, Boiling Springs Lake, and Terminal Geyser as hydrothermal destinations and requires visitors to remain on established trails or boardwalks.",
      "observation_id": "observation-nps-lassen-hydrothermal-20260923",
      "observed_at": null,
      "observer": "",
      "retrieved_at": "2026-09-23T03:30:00+00:00",
      "source_id": "source-nps-lassen-hydrothermal"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "NPS identifies Bumpass Hell, Sulphur Works, Devils Kitchen, Boiling Springs Lake, and Terminal Geyser as hydrothermal destinations and requires visitors to remain on established trails or boardwalks.",
    "observation_id": "observation-nps-lassen-hydrothermal-20260923",
    "observed_at": null,
    "observer": "",
    "retrieved_at": "2026-09-23T03:30:00+00:00",
    "source_id": "source-nps-lassen-hydrothermal"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.nps.gov/lavo/planyourvisit/exploring-the-hydrothermal-areas.htm",
      "publisher": "National Park Service",
      "source_id": "source-nps-lassen-hydrothermal"
    }
  ]
}