{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-mammoth-lakes-basin-route-map",
        "evidence_ids": [
          "evidence-mammoth-lakes-basin-route-map"
        ],
        "predicate": "mapped_day_hike_access",
        "spatial_scope_ids": [
          "scope-place-mammoth-lakes-basin"
        ],
        "subject_id": "place-mammoth-lakes-basin",
        "temporal_scope": null,
        "value": {
          "Coldwater Trailhead": "Heart Lake and Duck Pass routes",
          "Horseshoe Lake Trailhead": "McLeod Lake and Mammoth Pass routes",
          "Lake George Trailhead": "Crystal Lake Trail"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-mammoth-lakes-basin-route-map",
          "evidence_id": "evidence-mammoth-lakes-basin-route-map",
          "notes": "",
          "observation_id": "observation-usfs-mammoth-lakes-area-map-20260923",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The official Mammoth Lakes area map depicts Lake George and Crystal Lake Trail, Coldwater/Duck Pass trailhead with Heart and Emerald Lakes, and Horseshoe Lake/Mammoth Pass trailhead with McLeod Lake. It also distinguishes mapped trailheads, campgrounds, picnic areas, and restroom symbols, including locations explicitly marked as having no restroom.",
          "observation_id": "observation-usfs-mammoth-lakes-area-map-20260923",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-23T23:00:00+00:00",
          "source_id": "source-usfs-mammoth-lakes-area-map"
        }
      ],
      "sources": [
        {
          "locator": "https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd1173411.pdf",
          "publisher": "USDA Forest Service",
          "source_id": "source-usfs-mammoth-lakes-area-map"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-trailhead-horseshoe-lake-operational-profile",
        "evidence_ids": [
          "evidence-trailhead-horseshoe-lake-operational-profile-usfs",
          "evidence-trailhead-horseshoe-lake-operational-profile-town"
        ],
        "predicate": "trailhead_operational_profile",
        "spatial_scope_ids": [],
        "subject_id": "trailhead-horseshoe-lake-mammoth",
        "temporal_scope": null,
        "value": {
          "parking": {
            "capacity": "unknown",
            "overflow": "unknown",
            "present": true
          },
          "potable_water": {
            "status": "unknown"
          },
          "road_access": {
            "surface": "paved"
          },
          "route_connector": {
            "description": "Official map and Town plan depict trail access from the established trailhead and parking lot.",
            "exact_geometry": "unresolved",
            "status": "depicted"
          },
          "toilets": {
            "present": true,
            "type": "unknown"
          }
        }
      },
      "evidence": [
        {
          "claim_id": "claim-trailhead-horseshoe-lake-operational-profile",
          "evidence_id": "evidence-trailhead-horseshoe-lake-operational-profile-usfs",
          "notes": "",
          "observation_id": "observation-horseshoe-lake-trailhead-operations-20260925",
          "stance": "supports"
        },
        {
          "claim_id": "claim-trailhead-horseshoe-lake-operational-profile",
          "evidence_id": "evidence-trailhead-horseshoe-lake-operational-profile-town",
          "notes": "",
          "observation_id": "observation-town-horseshoe-lake-trailhead-operations-20260925",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Mammoth Lakes area map"
          ],
          "content": "The official Forest Service map depicts Mammoth Pass Trailhead at Horseshoe Lake on a paved-road approach; the map states that trailheads have restrooms unless marked otherwise, and this trailhead is not marked NO RR. The map does not publish parking capacity, overflow arrangements, or potable-water service.",
          "observation_id": "observation-horseshoe-lake-trailhead-operations-20260925",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-25T22:00:00+00:00",
          "source_id": "source-usfs-mammoth-lakes-area-map"
        },
        {
          "artifact_refs": [
            "Mammoth Lakes Walk, Bike, Ride draft 1.0"
          ],
          "content": "The Town plan identifies the existing Horseshoe Lake trailhead and parking lot with trail and vehicular access. The conceptual hub diagram also identifies restrooms. It does not publish parking capacity, overflow arrangements, or potable-water service.",
          "observation_id": "observation-town-horseshoe-lake-trailhead-operations-20260925",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-25T22:00:00+00:00",
          "source_id": "source-town-mammoth-lakes-walk-bike-ride-2017"
        }
      ],
      "sources": [
        {
          "locator": "https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd1173411.pdf",
          "publisher": "USDA Forest Service",
          "source_id": "source-usfs-mammoth-lakes-area-map"
        },
        {
          "locator": "https://www.townofmammothlakes.ca.gov/DocumentCenter/View/6459/20170302_MammothLakes_WalkBikeRide_Draft10?bidId=",
          "publisher": "Town of Mammoth Lakes",
          "source_id": "source-town-mammoth-lakes-walk-bike-ride-2017"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "place-mammoth-lakes-basin",
      "kind": "basin",
      "name": "Mammoth Lakes Basin"
    },
    {
      "entity_id": "trailhead-horseshoe-lake-mammoth",
      "kind": "trailhead",
      "name": "Horseshoe Lake Trailhead"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260923-eastern-sierra-foliage-hikes",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-usfs-mammoth-lakes-area-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-mammoth-lakes-area-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."
    }
  ],
  "navigation": {
    "next_id": "source-usfs-mcgee-wildflower-hot-spots",
    "position": 559,
    "previous_id": "source-usfs-june-lakes-area-trails-map",
    "total": 587
  },
  "observations": [
    {
      "artifact_refs": [
        "Mammoth Lakes area map"
      ],
      "content": "The official Forest Service map depicts Mammoth Pass Trailhead at Horseshoe Lake on a paved-road approach; the map states that trailheads have restrooms unless marked otherwise, and this trailhead is not marked NO RR. The map does not publish parking capacity, overflow arrangements, or potable-water service.",
      "observation_id": "observation-horseshoe-lake-trailhead-operations-20260925",
      "observed_at": null,
      "observer": "",
      "retrieved_at": "2026-09-25T22:00:00+00:00",
      "source_id": "source-usfs-mammoth-lakes-area-map"
    },
    {
      "artifact_refs": [],
      "content": "The official Mammoth Lakes area map depicts Lake George and Crystal Lake Trail, Coldwater/Duck Pass trailhead with Heart and Emerald Lakes, and Horseshoe Lake/Mammoth Pass trailhead with McLeod Lake. It also distinguishes mapped trailheads, campgrounds, picnic areas, and restroom symbols, including locations explicitly marked as having no restroom.",
      "observation_id": "observation-usfs-mammoth-lakes-area-map-20260923",
      "observed_at": null,
      "observer": "",
      "retrieved_at": "2026-09-23T23:00:00+00:00",
      "source_id": "source-usfs-mammoth-lakes-area-map"
    }
  ],
  "record": {
    "locator": "https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd1173411.pdf",
    "publisher": "USDA Forest Service",
    "source_id": "source-usfs-mammoth-lakes-area-map"
  },
  "record_type": "source",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd1173411.pdf",
      "publisher": "USDA Forest Service",
      "source_id": "source-usfs-mammoth-lakes-area-map"
    }
  ]
}