{
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      ],
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        {
          "artifact_refs": [],
          "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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      ],
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        {
          "artifact_refs": [],
          "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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      ],
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        {
          "artifact_refs": [],
          "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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        }
      ],
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        {
          "artifact_refs": [],
          "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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      ]
    },
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        "evidence_ids": [
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        "subject_id": "route-yost-lake",
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        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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      ]
    },
    {
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        "claim_id": "claim-yost-fern-route-profile",
        "evidence_ids": [
          "evidence-yost-fern-route-profile"
        ],
        "predicate": "route_profile",
        "spatial_scope_ids": [
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        ],
        "subject_id": "trailhead-yost-fern",
        "temporal_scope": null,
        "value": {
          "fern_beyond_fork_miles": 0.7,
          "fern_total_one_way_miles": 2.2,
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          "yost_beyond_fork_miles": 2.3,
          "yost_total_one_way_miles": 3.8
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        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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  ],
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    {
      "entity_id": "place-lundy-canyon",
      "kind": "place",
      "name": "Lundy Canyon"
    },
    {
      "entity_id": "route-fern-lake-june",
      "kind": "route",
      "name": "Fern Lake Trail"
    },
    {
      "entity_id": "route-lundy-canyon",
      "kind": "route",
      "name": "Lundy Canyon Trail"
    },
    {
      "entity_id": "route-parker-lake",
      "kind": "route",
      "name": "Parker Lake Trail"
    },
    {
      "entity_id": "route-yost-lake",
      "kind": "route",
      "name": "Yost Lake Trail"
    },
    {
      "entity_id": "trailhead-yost-fern",
      "kind": "trailhead",
      "name": "Yost and Fern Lakes Trailhead"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260923-eastern-sierra-foliage-hikes",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-usfs-mono-basin-day-hikes-20260923.json",
      "reason": "Publish a source-backed access and route foundation for Eastern Sierra fall-foliage day-hike alternatives near East Fork Campground.",
      "record_id": "observation-usfs-mono-basin-day-hikes-20260923",
      "record_type": "observation",
      "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": "observation-usfs-mosquito-flat-backpacker-campground-20260923",
    "position": 1282,
    "previous_id": "observation-usfs-mcgee-wildflower-hot-spots-20260923",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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      "source_id": "source-usfs-mono-basin-day-hikes"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "The Mono Basin day-hike guide maps Parker Lake, Yost and Fern Lakes, and Lundy Canyon. Parker Lake is 1.8 miles one way. The Yost/Fern route splits 1.5 miles from its trailhead; Fern Lake is another 0.7 mile and Yost Lake another 2.3 miles. Lundy Canyon reaches 20 Lakes Basin in 5.4 miles one way; its bottom two-thirds are easier and its upper third climbs steep switchbacks. The guide publishes road and parking directions for each trailhead.",
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    {
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      "publisher": "USDA Forest Service",
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}