{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-contra-loma-visitor-profile",
        "evidence_ids": [
          "evidence-ebrpd-contra-loma-visitor-profile"
        ],
        "predicate": "visitor_profile",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "access": [
            "Frederickson Lane main entrance",
            "swim lagoon",
            "boat launch",
            "ADA fishing dock",
            "three walk-in entrances"
          ],
          "accessible_facilities": [
            "restrooms",
            "drinking fountains",
            "parking",
            "south fishing dock by paved trail",
            "picnic areas",
            "pool lift",
            "loaner beach wheelchair"
          ],
          "acreage": 775,
          "activities": [
            "boating",
            "fishing",
            "hiking",
            "kid-friendly",
            "picnicking"
          ],
          "address": "1200 Frederickson Lane, Antioch, CA 94509",
          "alcohol_allowed": false,
          "bus_fee_usd": 25,
          "current_alerts": {
            "as_of": "2026-09-20",
            "blue_green_algae": "no advisory posted",
            "golden_mussels": "detected; boats launched here are quarantined 30 days from other inspected lakes",
            "lake_view_trail": "closed at cattle pond due to storm damage"
          },
          "fishing": {
            "district_fishing_permit_required": true
          },
          "parking_fee_usd": 5,
          "reservoir_acres": 80,
          "seasonal_hours": "opening varies from 06:00 to 07:00 and closing from 17:30 to 20:30 by month",
          "swim_lagoon": "closed for water-quality and maintenance challenges",
          "trail_connection": "Black Diamond Mines Regional Preserve",
          "trailered_vehicle_fee_usd": 5
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-visitor-profile",
          "evidence_id": "evidence-ebrpd-contra-loma-visitor-profile",
          "notes": "Direct transcription and conservative structuring of planning-relevant fields from the official park page.",
          "observation_id": "observation-ebrpd-contra-loma-visitor-profile",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Overview",
            "To Reach The Park",
            "Attractions"
          ],
          "content": "The live park page publishes the visitor profile represented by the associated claim, including access, operating information, facilities, and material restrictions.",
          "observation_id": "observation-ebrpd-contra-loma-visitor-profile",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-20T07:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "park-contra-loma-regional-park",
      "kind": "park",
      "name": "Contra Loma Regional Park"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-parks-batch-06",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-ebrpd-contra-loma-visitor-profile.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "observation-ebrpd-contra-loma-visitor-profile",
      "record_type": "observation",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    }
  ],
  "navigation": {
    "next_id": "observation-ebrpd-contra-loma-water-rules-20260922",
    "position": 74,
    "previous_id": "observation-ebrpd-claremont-canyon-visitor-profile",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [
        "Overview",
        "To Reach The Park",
        "Attractions"
      ],
      "content": "The live park page publishes the visitor profile represented by the associated claim, including access, operating information, facilities, and material restrictions.",
      "observation_id": "observation-ebrpd-contra-loma-visitor-profile",
      "observed_at": null,
      "observer": "Wayproof live source review",
      "retrieved_at": "2026-09-20T07:00:00+00:00",
      "source_id": "source-ebrpd-contra-loma-park-page"
    }
  ],
  "record": {
    "artifact_refs": [
      "Overview",
      "To Reach The Park",
      "Attractions"
    ],
    "content": "The live park page publishes the visitor profile represented by the associated claim, including access, operating information, facilities, and material restrictions.",
    "observation_id": "observation-ebrpd-contra-loma-visitor-profile",
    "observed_at": null,
    "observer": "Wayproof live source review",
    "retrieved_at": "2026-09-20T07:00:00+00:00",
    "source_id": "source-ebrpd-contra-loma-park-page"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/parks/contra-loma",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-contra-loma-park-page"
    }
  ]
}