{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-route-segment-chickenfoot-lake-spur",
        "evidence_ids": [
          "evidence-route-segment-chickenfoot-lake-spur"
        ],
        "predicate": "official_dataset_route_segment",
        "spatial_scope_ids": [
          "scope-route-chickenfoot-lake-spur"
        ],
        "subject_id": "route-segment-chickenfoot-lake-spur",
        "temporal_scope": null,
        "value": {
          "coordinate_reference_system": "EPSG:4269",
          "dataset_feature_id": "{C297D7C0-E296-46F8-B9E3-36D3A65ECDDD}",
          "dataset_feature_name": "CHICKENFOOT LAKE",
          "dataset_field": "lengthmiles",
          "distance_miles": 0.24964325,
          "distance_status": "known",
          "end_coordinate": {
            "latitude": 37.39799487424227,
            "longitude": -118.75324217507011
          },
          "geometry_snapshot": {
            "feature_id": "{C297D7C0-E296-46F8-B9E3-36D3A65ECDDD}",
            "path": "geometry/v0/snapshots/usgs-rock-creek-route-extensions-20260924.geojson",
            "sha256": "3eb86c55a257e822f85226319612b375e7440019d56be5231b030415f138b471"
          },
          "route_role": "official_mainline",
          "source_data_description": "USFS Trails Update 03/2026",
          "source_dataset_id": "{8CC4DB36-D0BE-4189-88C7-64C3569EB754}",
          "source_edit_date": 1774742400000,
          "source_feature_id": "6532",
          "source_load_date": 1777310283000,
          "source_originator": "U.S. Forest Service",
          "start_coordinate": {
            "latitude": 37.395501527371096,
            "longitude": -118.75488882715086
          }
        }
      },
      "evidence": [
        {
          "claim_id": "claim-route-segment-chickenfoot-lake-spur",
          "evidence_id": "evidence-route-segment-chickenfoot-lake-spur",
          "notes": "",
          "observation_id": "observation-usgs-rock-creek-route-extensions-20260924",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "geometry/v0/snapshots/usgs-rock-creek-route-extensions-20260924.geojson",
            "3eb86c55a257e822f85226319612b375e7440019d56be5231b030415f138b471"
          ],
          "content": "A bounded National Digital Trails result contains nine contiguous Upper Rock Creek Canyon features plus named Chickenfoot Lake and Gem Lakes spurs. Eleven reviewed features and source-field lengths are retained without proximity snapping or inferred mainline cuts.",
          "observation_id": "observation-usgs-rock-creek-route-extensions-20260924",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-24T02:00:00+00:00",
          "source_id": "source-usgs-national-digital-trails-rock-creek-extensions-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-rock-creek-extensions-20260924"
        }
      ],
      "subject": {
        "entity_id": "route-segment-chickenfoot-lake-spur",
        "kind": "route_segment",
        "name": "Chickenfoot Lake segment"
      }
    },
    {
      "claim": {
        "claim_id": "claim-route-chickenfoot-lake-spur-profile",
        "evidence_ids": [
          "evidence-route-chickenfoot-lake-spur-profile"
        ],
        "predicate": "route_profile",
        "spatial_scope_ids": [
          "scope-route-chickenfoot-lake-spur"
        ],
        "subject_id": "route-chickenfoot-lake-spur",
        "temporal_scope": null,
        "value": {
          "bidirectional": true,
          "distance_basis": "USGS source-field lengthmiles",
          "distance_status": "known",
          "mainline_junction_mileage_status": "unknown",
          "one_way_distance_miles": 0.24964325,
          "route_role": "named side spur"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-route-chickenfoot-lake-spur-profile",
          "evidence_id": "evidence-route-chickenfoot-lake-spur-profile",
          "notes": "",
          "observation_id": "observation-usgs-rock-creek-route-extensions-20260924",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "geometry/v0/snapshots/usgs-rock-creek-route-extensions-20260924.geojson",
            "3eb86c55a257e822f85226319612b375e7440019d56be5231b030415f138b471"
          ],
          "content": "A bounded National Digital Trails result contains nine contiguous Upper Rock Creek Canyon features plus named Chickenfoot Lake and Gem Lakes spurs. Eleven reviewed features and source-field lengths are retained without proximity snapping or inferred mainline cuts.",
          "observation_id": "observation-usgs-rock-creek-route-extensions-20260924",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-24T02:00:00+00:00",
          "source_id": "source-usgs-national-digital-trails-rock-creek-extensions-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-rock-creek-extensions-20260924"
        }
      ],
      "subject": {
        "entity_id": "route-chickenfoot-lake-spur",
        "kind": "route",
        "name": "Chickenfoot Lake Spur"
      }
    }
  ],
  "entity": {
    "entity_id": "route-chickenfoot-lake-spur",
    "kind": "route",
    "name": "Chickenfoot Lake Spur"
  },
  "gap_details": [
    {
      "claims": [],
      "entities": [
        {
          "entity_id": "route-chickenfoot-lake-spur",
          "kind": "route",
          "name": "Chickenfoot Lake Spur"
        },
        {
          "entity_id": "route-gem-lakes-spur",
          "kind": "route",
          "name": "Gem Lakes Spur"
        },
        {
          "entity_id": "route-little-lakes-valley",
          "kind": "route",
          "name": "Little Lakes Valley Trail"
        }
      ],
      "history": [
        {
          "action": "ADD",
          "change_set_id": "wp-20260923-rock-creek-corridor-principal-routes",
          "evidence_refs": [],
          "knowledge_gap_refs": [],
          "path": "canonical/v0/gaps/gap-rock-creek-gem-chickenfoot-spur-connectors.json",
          "reason": "Publish the official Rock Creek corridor, principal distance-bearing hiking topology, reviewed geometry, and Mosquito Flat overnight-permit boundary.",
          "record_id": "gap-rock-creek-gem-chickenfoot-spur-connectors",
          "record_type": "gap",
          "summary": "Add the Rock Creek developed corridor, five principal bidirectional hiking routes with reviewed GeoJSON, Mosquito Flat access, overnight permit and food-storage requirements, and explicit unresolved spur/current-condition gaps."
        },
        {
          "action": "REPLACE",
          "change_set_id": "wp-20260924-rock-creek-route-and-summit-depth",
          "evidence_refs": [],
          "knowledge_gap_refs": [],
          "path": "canonical/v0/gaps/gap-rock-creek-gem-chickenfoot-spur-connectors.json",
          "reason": "Add source-backed Upper Rock Creek topology, measured Little Lakes spurs, and planning-grade summit approaches.",
          "record_id": "gap-rock-creek-gem-chickenfoot-spur-connectors",
          "record_type": "gap",
          "summary": "Add the nine-segment Upper Rock Creek Canyon graph, source-measured Chickenfoot and Gem spurs without inferred mainline cuts, and qualified summit approach profiles for five nearby peaks."
        }
      ],
      "navigation": {
        "next_id": "gap-rock-creek-little-lakes-intermediate-mileages",
        "position": 243,
        "previous_id": "gap-reserveamerica-sunol-site-water-restroom-proximity",
        "total": 299
      },
      "observations": [],
      "record": {
        "gap_id": "gap-rock-creek-gem-chickenfoot-spur-connectors",
        "question": "At what source-published mileage does each named Chickenfoot and Gem spur leave the Little Lakes mainline?",
        "reason": "Official sources establish the spur identities and lengths, but the spur and mainline features do not share exact endpoints and no source publishes their mileage positions along the unsplit 3.104216-mile mainline. The graph therefore preserves branches_from context without proximity-snapping a traversable junction.",
        "related_ids": [
          "route-little-lakes-valley",
          "route-chickenfoot-lake-spur",
          "route-gem-lakes-spur"
        ]
      },
      "record_type": "gap",
      "related_records": [
        {
          "record": {
            "entity_id": "route-little-lakes-valley",
            "kind": "route",
            "name": "Little Lakes Valley Trail"
          },
          "record_id": "route-little-lakes-valley",
          "record_type": "entity"
        },
        {
          "record": {
            "entity_id": "route-chickenfoot-lake-spur",
            "kind": "route",
            "name": "Chickenfoot Lake Spur"
          },
          "record_id": "route-chickenfoot-lake-spur",
          "record_type": "entity"
        },
        {
          "record": {
            "entity_id": "route-gem-lakes-spur",
            "kind": "route",
            "name": "Gem Lakes Spur"
          },
          "record_id": "route-gem-lakes-spur",
          "record_type": "entity"
        }
      ],
      "sources": []
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260924-rock-creek-route-and-summit-depth",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/route-chickenfoot-lake-spur.json",
      "reason": "Add source-backed Upper Rock Creek topology, measured Little Lakes spurs, and planning-grade summit approaches.",
      "record_id": "route-chickenfoot-lake-spur",
      "record_type": "entity",
      "summary": "Add the nine-segment Upper Rock Creek Canyon graph, source-measured Chickenfoot and Gem spurs without inferred mainline cuts, and qualified summit approach profiles for five nearby peaks."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260924-rock-creek-route-and-summit-depth",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-route-segment-chickenfoot-lake-spur.json",
      "reason": "Add source-backed Upper Rock Creek topology, measured Little Lakes spurs, and planning-grade summit approaches.",
      "record_id": "claim-route-segment-chickenfoot-lake-spur",
      "record_type": "claim",
      "summary": "Add the nine-segment Upper Rock Creek Canyon graph, source-measured Chickenfoot and Gem spurs without inferred mainline cuts, and qualified summit approach profiles for five nearby peaks."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260924-rock-creek-route-and-summit-depth",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-route-chickenfoot-lake-spur-profile.json",
      "reason": "Add source-backed Upper Rock Creek topology, measured Little Lakes spurs, and planning-grade summit approaches.",
      "record_id": "claim-route-chickenfoot-lake-spur-profile",
      "record_type": "claim",
      "summary": "Add the nine-segment Upper Rock Creek Canyon graph, source-measured Chickenfoot and Gem spurs without inferred mainline cuts, and qualified summit approach profiles for five nearby peaks."
    }
  ],
  "journey": [],
  "knowledge_gaps": [
    {
      "gap_id": "gap-rock-creek-gem-chickenfoot-spur-connectors",
      "question": "At what source-published mileage does each named Chickenfoot and Gem spur leave the Little Lakes mainline?",
      "reason": "Official sources establish the spur identities and lengths, but the spur and mainline features do not share exact endpoints and no source publishes their mileage positions along the unsplit 3.104216-mile mainline. The graph therefore preserves branches_from context without proximity-snapping a traversable junction.",
      "related_ids": [
        "route-little-lakes-valley",
        "route-chickenfoot-lake-spur",
        "route-gem-lakes-spur"
      ]
    }
  ],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-route-segment-chickenfoot-lake-spur"
      ],
      "object_id": "route-little-lakes-valley",
      "predicate": "branches_from",
      "relationship_id": "relationship-route-chickenfoot-lake-spur-branches-from-little-lakes",
      "subject_id": "route-chickenfoot-lake-spur",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-route-segment-chickenfoot-lake-spur"
      ],
      "object_id": "waterbody-chickenfoot-lake-rock-creek",
      "predicate": "ends_at",
      "relationship_id": "relationship-route-chickenfoot-lake-spur-ends-at",
      "subject_id": "route-chickenfoot-lake-spur",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-route-segment-chickenfoot-lake-spur"
      ],
      "object_id": "route-chickenfoot-lake-spur",
      "predicate": "part_of",
      "relationship_id": "relationship-route-segment-chickenfoot-lake-spur-part-of-route-chickenfoot-lake-spur",
      "subject_id": "route-segment-chickenfoot-lake-spur",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-route-segment-chickenfoot-lake-spur"
      ],
      "object_id": "route-node-little-lakes-chickenfoot-junction",
      "predicate": "starts_at",
      "relationship_id": "relationship-route-chickenfoot-lake-spur-starts-at",
      "subject_id": "route-chickenfoot-lake-spur",
      "temporal_scope": null
    }
  ],
  "route_geometry": {
    "features": [
      {
        "geometry": {
          "coordinates": [
            [
              -118.75488882715086,
              37.395501527371096
            ],
            [
              -118.75476979173442,
              37.39558777216263
            ],
            [
              -118.75475921360942,
              37.395636688829256
            ],
            [
              -118.75474519069274,
              37.395698603412484
            ],
            [
              -118.75472424173444,
              37.39574485237074
            ],
            [
              -118.75472685944277,
              37.39580158674568
            ],
            [
              -118.7547165229845,
              37.39584923466225
            ],
            [
              -118.75465258027623,
              37.39596456382873
            ],
            [
              -118.75464508652624,
              37.39600822216198
            ],
            [
              -118.75463155840129,
              37.39610995653686
            ],
            [
              -118.75462791465128,
              37.39612075445348
            ],
            [
              -118.75460657610967,
              37.396396485703065
            ],
            [
              -118.75461659694298,
              37.396430774244664
            ],
            [
              -118.75462668235963,
              37.396450935703
            ],
            [
              -118.75487940735923,
              37.39648076070296
            ],
            [
              -118.75487818340088,
              37.396485181536264
            ],
            [
              -118.75491596048414,
              37.396515038827886
            ],
            [
              -118.75492219798417,
              37.39668559195263
            ],
            [
              -118.75485885631758,
              37.39687089403566
            ],
            [
              -118.75484514381759,
              37.39693380653557
            ],
            [
              -118.75484813444262,
              37.39699823257712
            ],
            [
              -118.75483805423431,
              37.39704059299373
            ],
            [
              -118.75478016673435,
              37.39715473153524
            ],
            [
              -118.7547479917344,
              37.39720794507679
            ],
            [
              -118.75470078235952,
              37.39724500757677
            ],
            [
              -118.75464734902624,
              37.39732680340995
            ],
            [
              -118.75463582506791,
              37.397411502368186
            ],
            [
              -118.75460879590133,
              37.397453362784745
            ],
            [
              -118.75455607194306,
              37.397501955493
            ],
            [
              -118.75449860735984,
              37.39760992736785
            ],
            [
              -118.75445156465156,
              37.39767324299277
            ],
            [
              -118.75436560319338,
              37.39774051486762
            ],
            [
              -118.75430929173513,
              37.39778215445091
            ],
            [
              -118.75424611048521,
              37.39780993674253
            ],
            [
              -118.75409308444375,
              37.39787988674243
            ],
            [
              -118.75404378652718,
              37.39789068361739
            ],
            [
              -118.75396618444398,
              37.39786256695078
            ],
            [
              -118.75391516673574,
              37.397855552367446
            ],
            [
              -118.75386294486077,
              37.39783723570082
            ],
            [
              -118.75379420631924,
              37.397819376325856
            ],
            [
              -118.75377128652758,
              37.397810299242565
            ],
            [
              -118.75364494173613,
              37.39780288778422
            ],
            [
              -118.75357733548623,
              37.39783629507582
            ],
            [
              -118.75351775527798,
              37.39786540445078
            ],
            [
              -118.75345414694476,
              37.39788476590911
            ],
            [
              -118.75338412194486,
              37.397903394034074
            ],
            [
              -118.75324217507011,
              37.39799487424227
            ]
          ],
          "type": "LineString"
        },
        "properties": {
          "distance_miles": 0.24964325,
          "distance_status": "known",
          "end_node_id": "waterbody-chickenfoot-lake-rock-creek",
          "route_id": "route-chickenfoot-lake-spur",
          "route_role": "official_mainline",
          "segment_id": "route-segment-chickenfoot-lake-spur",
          "sequence": 1,
          "source_feature_id": "{C297D7C0-E296-46F8-B9E3-36D3A65ECDDD}",
          "source_geometry_accuracy": null,
          "start_node_id": "route-node-little-lakes-chickenfoot-junction"
        },
        "type": "Feature"
      }
    ],
    "type": "FeatureCollection",
    "wayproof": {
      "distance_complete": true,
      "distance_miles": 0.24964325,
      "entry_id": "route-node-little-lakes-chickenfoot-junction",
      "exit_id": "waterbody-chickenfoot-lake-rock-creek",
      "geometry_status": "reviewed_source_snapshot",
      "navigation_grade": false,
      "route_id": "route-chickenfoot-lake-spur"
    }
  },
  "route_geometry_url": "/geometry/routes/route-chickenfoot-lake-spur.geojson",
  "type": "canonical_entity"
}
