{
  "claims": [],
  "entities": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260923-eastern-sierra-foliage-hikes",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-usfs-sabrina-north-lake-trails-map.json",
      "reason": "Publish a source-backed access and route foundation for Eastern Sierra fall-foliage day-hike alternatives near East Fork Campground.",
      "record_id": "source-usfs-sabrina-north-lake-trails-map",
      "record_type": "source",
      "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": "REPLACE",
      "change_set_id": "wp-20260924-bishop-creek-route-depth",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-usfs-sabrina-north-lake-trails-map.json",
      "reason": "Add source-backed Blue Lake and Piute Pass topology, geometry, and trip-distance implications.",
      "record_id": "source-usfs-sabrina-north-lake-trails-map",
      "record_type": "source",
      "summary": "Add connected Blue Lake and Piute Pass route geometry, retain the North Lake parking approach, and narrow the unresolved Bishop Creek distance gap."
    }
  ],
  "navigation": {
    "next_id": "source-usfs-shepherd-pass-trail",
    "position": 571,
    "previous_id": "source-usfs-rock-creek-wilderness-hiking-guide",
    "total": 587
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "The official Sabrina and North Lake area map depicts the Sabrina Basin route to Blue Lake and the North Lake approaches to Piute Pass and Lamarck Lakes.",
      "observation_id": "observation-usfs-sabrina-north-lake-trails-map-20260923",
      "observed_at": null,
      "observer": "",
      "retrieved_at": "2026-09-23T23:00:00+00:00",
      "source_id": "source-usfs-sabrina-north-lake-trails-map"
    }
  ],
  "record": {
    "locator": "https://www.fs.usda.gov/media/122910",
    "publisher": "USDA Forest Service",
    "source_id": "source-usfs-sabrina-north-lake-trails-map"
  },
  "record_type": "source",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.fs.usda.gov/media/122910",
      "publisher": "USDA Forest Service",
      "source_id": "source-usfs-sabrina-north-lake-trails-map"
    }
  ]
}