{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-marsh-creek-weekday-closure-2026",
        "evidence_ids": [
          "evidence-marsh-creek-weekday-closure-2026"
        ],
        "predicate": "trail_access_status",
        "spatial_scope_ids": [],
        "subject_id": "route-marsh-creek-regional-trail",
        "temporal_scope": {
          "ends_on": "2026-09-22",
          "starts_on": "2026-08-17"
        },
        "value": {
          "cause": "pavement work",
          "segment": "Creekside Park in Brentwood to East Cypress Road in Oakley",
          "status": "closed_select_weekdays",
          "weekends": "scheduled open"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-marsh-creek-weekday-closure-2026",
          "evidence_id": "evidence-marsh-creek-weekday-closure-2026",
          "notes": "Live EBRPD alert; recheck the official alerts page before travel.",
          "observation_id": "observation-ebrpd-alerts-closures-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Alerts and Closures table"
          ],
          "content": "The district alerts page published the park, trail, facility, and water conditions represented by the associated claims. Entries with insufficient page context were not promoted.",
          "observation_id": "observation-ebrpd-alerts-closures-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T18:30:00+00:00",
          "source_id": "source-ebrpd-alerts-closures"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/alerts-closures",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-alerts-closures"
        }
      ],
      "subject": {
        "entity_id": "route-marsh-creek-regional-trail",
        "kind": "route",
        "name": "Marsh Creek Regional Trail"
      }
    }
  ],
  "entity": {
    "entity_id": "route-marsh-creek-regional-trail",
    "kind": "route",
    "name": "Marsh Creek Regional Trail"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260922-ebrpd-current-conditions",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/route-marsh-creek-regional-trail.json",
      "reason": "Materialize an unambiguous actionable condition from the district alerts page.",
      "record_id": "route-marsh-creek-regional-trail",
      "record_type": "entity",
      "summary": "Materialize current EBRPD closures and water disruptions for pre-trip rechecks."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260922-ebrpd-current-conditions",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-marsh-creek-weekday-closure-2026.json",
      "reason": "Materialize an unambiguous actionable condition from the district alerts page.",
      "record_id": "claim-marsh-creek-weekday-closure-2026",
      "record_type": "claim",
      "summary": "Materialize current EBRPD closures and water disruptions for pre-trip rechecks."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}