{
  "answerability": "evidence_backed_claims_available",
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    {
      "claim": {
        "claim_id": "claim-sabrina-basin-access-profile",
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        ],
        "subject_id": "trailhead-sabrina-basin",
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        "value": {
          "day_use_parking": "at road end",
          "published_elevation_ft": 9040,
          "road": "Highway 168",
          "route_destination": "Blue Lake"
        }
      },
      "evidence": [
        {
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          "notes": "",
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          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Bishop Creek guide locates Sabrina Basin day-use parking at the end of Highway 168 and describes the main trail to Blue Lake. It locates Piute Pass hiker parking by North Lake near the pack station, with the trailhead about half a mile farther in North Lake Campground, where hikers may not park. The Piute Pass trail begins through lodgepole pine and quaking aspens.",
          "observation_id": "observation-usfs-bishop-creek-wilderness-hiking-20260923",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-23T23:00:00+00:00",
          "source_id": "source-usfs-bishop-creek-wilderness-hiking"
        }
      ],
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        {
          "locator": "https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5195702.pdf",
          "publisher": "USDA Forest Service",
          "source_id": "source-usfs-bishop-creek-wilderness-hiking"
        }
      ],
      "subject": {
        "entity_id": "trailhead-sabrina-basin",
        "kind": "trailhead",
        "name": "Sabrina Basin Trailhead"
      }
    },
    {
      "claim": {
        "claim_id": "claim-trailhead-sabrina-basin-map-point",
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        ],
        "predicate": "reviewed_access_point_coordinate",
        "spatial_scope_ids": [],
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        "value": {
          "geometry_snapshot": {
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            "path": "geometry/v0/snapshots/eastern-sierra-trailhead-points-20260925.geojson",
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          "latitude": 37.21366032842563,
          "longitude": -118.61004803668888,
          "navigation_grade": false,
          "provenance": "reviewed_usgs_route_endpoint",
          "source_feature_id": "{45370059-EF96-45D5-B604-31AEF96807FC}",
          "source_ids": [
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          ]
        }
      },
      "evidence": [
        {
          "claim_id": "claim-trailhead-sabrina-basin-map-point",
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          "notes": "",
          "observation_id": "observation-usgs-eastern-sierra-trailhead-endpoints-20260925",
          "stance": "supports"
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      ],
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        {
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          ],
          "content": "Reviewed National Digital Trails features place evidenced route endpoints at the Parker Lake, McGee Creek, Tamarack Lakes, Mosquito Flat, North Lake, Sabrina Basin, South Lake, Yost/Fern, Upper Rock Creek/East Fork, and Lundy Canyon access identities. The Lundy endpoint is independently corroborated by a named OpenStreetMap trailhead point approximately ten meters away.",
          "observation_id": "observation-usgs-eastern-sierra-trailhead-endpoints-20260925",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-25T13:00:00+00:00",
          "source_id": "source-usgs-national-digital-trails-eastern-sierra-20260924"
        }
      ],
      "sources": [
        {
          "locator": "https://partnerships.nationalmap.gov/arcgis/rest/services/USGSTrails/MapServer/0",
          "publisher": "U.S. Geological Survey / U.S. Forest Service",
          "source_id": "source-usgs-national-digital-trails-eastern-sierra-20260924"
        }
      ],
      "subject": {
        "entity_id": "trailhead-sabrina-basin",
        "kind": "trailhead",
        "name": "Sabrina Basin Trailhead"
      }
    }
  ],
  "entity": {
    "entity_id": "trailhead-sabrina-basin",
    "kind": "trailhead",
    "name": "Sabrina Basin Trailhead"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260923-eastern-sierra-foliage-hikes",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/trailhead-sabrina-basin.json",
      "reason": "Publish a source-backed access and route foundation for Eastern Sierra fall-foliage day-hike alternatives near East Fork Campground.",
      "record_id": "trailhead-sabrina-basin",
      "record_type": "entity",
      "summary": "Add source-backed Eastern Sierra foliage-hike trailheads, managing areas, route associations, published distances and hazards, plus explicit research and pre-trip gaps."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260923-eastern-sierra-foliage-hikes",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-sabrina-basin-access-profile.json",
      "reason": "Publish a source-backed access and route foundation for Eastern Sierra fall-foliage day-hike alternatives near East Fork Campground.",
      "record_id": "claim-sabrina-basin-access-profile",
      "record_type": "claim",
      "summary": "Add source-backed Eastern Sierra foliage-hike trailheads, managing areas, route associations, published distances and hazards, plus explicit research and pre-trip gaps."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260925-eastern-sierra-trailhead-map-points",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-trailhead-sabrina-basin-map-point.json",
      "reason": "Publish reviewed East Side access points without inferring access from proximity.",
      "record_id": "claim-trailhead-sabrina-basin-map-point",
      "record_type": "claim",
      "summary": "Publish 13 evidenced East Side trail access points and preserve three unresolved connector or identity questions."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-sabrina-basin-access-profile"
      ],
      "object_id": "route-sabrina-blue-lake",
      "predicate": "accesses",
      "relationship_id": "relationship-sabrina-trailhead-accesses-route",
      "subject_id": "trailhead-sabrina-basin",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
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      ],
      "object_id": "place-bishop-creek-canyon",
      "predicate": "located_in",
      "relationship_id": "relationship-trailhead-sabrina-basin-located-in-bishop-creek-canyon",
      "subject_id": "trailhead-sabrina-basin",
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    },
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      "object_id": "trailhead-sabrina-basin",
      "predicate": "manages",
      "relationship_id": "relationship-inyo-manages-sabrina-trailhead",
      "subject_id": "agency-inyo-national-forest",
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    },
    {
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      ],
      "object_id": "trailhead-sabrina-basin",
      "predicate": "starts_at",
      "relationship_id": "relationship-route-sabrina-blue-lake-starts-at-dataset-entry",
      "subject_id": "route-sabrina-blue-lake",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
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      ],
      "object_id": "trailhead-sabrina-basin",
      "predicate": "starts_at",
      "relationship_id": "relationship-route-segment-sabrina-blue-lake-01-starts-at",
      "subject_id": "route-segment-sabrina-blue-lake-01",
      "temporal_scope": null
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  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}