{
 "ocl_version": "0.1.0",
 "name": "Lincoln Gap Road (east side)",
 "slug": "lincoln-gap-road-east-side",
 "confidence": "B",
 "reported_claims": [
  {
   "source_name": "US cycling press / folklore",
   "value_pct": 16,
   "evidence_type": "other",
   "claimed_window_m": null,
   "description": "'Steepest paved mile in America' \u2014 the top mile is widely reported as averaging ~16%",
   "retrieved_at": "2026-08-21",
   "credibility": "Widely repeated across US cycling press; measured steepest continuous mile 16.04% (smoke test 2026-08-21) brackets it almost exactly",
   "observed_via": "press_reports"
  },
  {
   "source_name": "US cycling press (short-pitch claims)",
   "value_pct": 24,
   "evidence_type": "other",
   "claimed_window_m": null,
   "description": "'Pitches of 24%' claims for the steepest ramp",
   "retrieved_at": "2026-08-21",
   "credibility": "Short-window scale: measured 2 m diagnostic 22.68% \u00b17pp (2026-08-21 smoke test) \u2014 consistent at sign-length baselines",
   "observed_via": "press_reports"
  }
 ],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.965223166764304,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 5060.0,
   "end_distance_m": 5062.0,
   "start_elevation_m": 503.9226997528498,
   "end_elevation_m": 504.38200421618507,
   "min_gradient_pct": -4.694163947641528
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.02671121260285,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6040.0,
   "end_distance_m": 6043.0,
   "start_elevation_m": 654.049782269828,
   "end_elevation_m": 654.7105836062061,
   "min_gradient_pct": -4.424797268262637
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.8704496242799,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6037.0,
   "end_distance_m": 6042.0,
   "start_elevation_m": 653.398877250535,
   "end_elevation_m": 654.492399731749,
   "min_gradient_pct": -4.280203878716975
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.74498063955184,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6033.0,
   "end_distance_m": 6043.0,
   "start_elevation_m": 652.5360855422509,
   "end_elevation_m": 654.7105836062061,
   "min_gradient_pct": -4.131335306216215
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.382580911585478,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6023.0,
   "end_distance_m": 6043.0,
   "start_elevation_m": 650.434067423889,
   "end_elevation_m": 654.7105836062061,
   "min_gradient_pct": -4.019250711567963
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.299915008988137,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6019.0,
   "end_distance_m": 6044.0,
   "start_elevation_m": 649.5923991501068,
   "end_elevation_m": 654.9173779023538,
   "min_gradient_pct": -3.73798315289514
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.976995489666706,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6013.0,
   "end_distance_m": 6063.0,
   "start_elevation_m": 648.3571573337612,
   "end_elevation_m": 658.8456550785945,
   "min_gradient_pct": -3.2449047975471785
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.351179812330315,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 5982.0,
   "end_distance_m": 6082.0,
   "start_elevation_m": 642.1166320807273,
   "end_elevation_m": 662.4678118930576,
   "min_gradient_pct": -2.2923769594758028
  }
 ],
 "shape": {
  "ascent_concentration": 0.559,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 656.0,
  "shape_class": "stepped"
 },
 "length_m": 6586.000000000078,
 "start_elevation_m": 286.383295450616,
 "end_elevation_m": 738.0810173754772,
 "endpoint_gain_m": 451.69772192486124,
 "overall_gradient_pct": 6.858453111522258,
 "accumulated_ascent_m": 469.35061059580084,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.8704496242799,
   "start_distance_m": 6037.0,
   "end_distance_m": 6042.0,
   "midpoint_distance_m": 6039.5,
   "start_elevation_m": 653.398877250535,
   "end_elevation_m": 654.492399731749,
   "start_xy": [
    666302.8293172971,
    4884504.561887876
   ],
   "end_xy": [
    666298.0324179996,
    4884503.151300364
   ]
  },
  "max_10m": {
   "gradient_pct": 21.74498063955184,
   "start_distance_m": 6033.0,
   "end_distance_m": 6043.0,
   "midpoint_distance_m": 6038.0,
   "start_elevation_m": 652.5360855422509,
   "end_elevation_m": 654.7105836062061,
   "start_xy": [
    666306.7343177863,
    4884505.383190467
   ],
   "end_xy": [
    666297.0730381401,
    4884502.869182861
   ]
  },
  "max_20m": {
   "gradient_pct": 21.382580911585478,
   "start_distance_m": 6023.0,
   "end_distance_m": 6043.0,
   "midpoint_distance_m": 6033.0,
   "start_elevation_m": 650.434067423889,
   "end_elevation_m": 654.7105836062061,
   "start_xy": [
    666316.6271907812,
    4884506.843006862
   ],
   "end_xy": [
    666297.0730381401,
    4884502.869182861
   ]
  },
  "max_25m": {
   "gradient_pct": 21.299915008988137,
   "start_distance_m": 6019.0,
   "end_distance_m": 6044.0,
   "midpoint_distance_m": 6031.5,
   "start_elevation_m": 649.5923991501068,
   "end_elevation_m": 654.9173779023538,
   "start_xy": [
    666320.5843399792,
    4884507.42693342
   ],
   "end_xy": [
    666296.1136582805,
    4884502.58706536
   ]
  },
  "max_50m": {
   "gradient_pct": 20.976995489666706,
   "start_distance_m": 6013.0,
   "end_distance_m": 6063.0,
   "midpoint_distance_m": 6038.0,
   "start_elevation_m": 648.3571573337612,
   "end_elevation_m": 658.8456550785945,
   "start_xy": [
    666326.5200637762,
    4884508.302823257
   ],
   "end_xy": [
    666278.9605056125,
    4884494.777764815
   ]
  },
  "max_100m": {
   "gradient_pct": 20.351179812330315,
   "start_distance_m": 5982.0,
   "end_distance_m": 6082.0,
   "midpoint_distance_m": 6032.0,
   "start_elevation_m": 642.1166320807273,
   "end_elevation_m": 662.4678118930576,
   "start_xy": [
    666356.9535544978,
    4884514.022078716
   ],
   "end_xy": [
    666263.1604804698,
    4884484.252889802
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.280203878716975,
   "start_distance_m": 4109.0,
   "end_distance_m": 4114.0,
   "midpoint_distance_m": 4111.5,
   "start_elevation_m": 409.3081989283763,
   "end_elevation_m": 409.0941887344405,
   "start_xy": [
    667548.5690074549,
    4884871.878938097
   ],
   "end_xy": [
    667544.5787928271,
    4884868.865935072
   ]
  },
  "min_10m": {
   "gradient_pct": -4.131335306216215,
   "start_distance_m": 4106.0,
   "end_distance_m": 4116.0,
   "midpoint_distance_m": 4111.0,
   "start_elevation_m": 409.4255318145389,
   "end_elevation_m": 409.01239828391726,
   "start_xy": [
    667550.9631362315,
    4884873.686739911
   ],
   "end_xy": [
    667542.982706976,
    4884867.660733863
   ]
  },
  "min_20m": {
   "gradient_pct": -4.019250711567963,
   "start_distance_m": 4100.0,
   "end_distance_m": 4120.0,
   "midpoint_distance_m": 4110.0,
   "start_elevation_m": 409.6624954805283,
   "end_elevation_m": 408.8586453382147,
   "start_xy": [
    667555.7208624041,
    4884877.341697782
   ],
   "end_xy": [
    667539.7905352738,
    4884865.250331443
   ]
  },
  "min_25m": {
   "gradient_pct": -3.73798315289514,
   "start_distance_m": 4095.0,
   "end_distance_m": 4120.0,
   "midpoint_distance_m": 4107.5,
   "start_elevation_m": 409.7931411264385,
   "end_elevation_m": 408.8586453382147,
   "start_xy": [
    667559.6310281019,
    4884880.4578820225
   ],
   "end_xy": [
    667539.7905352738,
    4884865.250331443
   ]
  },
  "min_50m": {
   "gradient_pct": -3.2449047975471785,
   "start_distance_m": 3547.0,
   "end_distance_m": 3597.0,
   "midpoint_distance_m": 3572.0,
   "start_elevation_m": 416.54834205744294,
   "end_elevation_m": 414.92588965866935,
   "start_xy": [
    668006.3004465472,
    4885189.989162442
   ],
   "end_xy": [
    667958.6479053872,
    4885174.871802688
   ]
  },
  "min_100m": {
   "gradient_pct": -2.2923769594758028,
   "start_distance_m": 3535.0,
   "end_distance_m": 3635.0,
   "midpoint_distance_m": 3585.0,
   "start_elevation_m": 416.6892953421737,
   "end_elevation_m": 414.3969183826979,
   "start_xy": [
    668017.7750296625,
    4885193.501133731
   ],
   "end_xy": [
    667923.3291921114,
    4885160.905569094
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.965223166764304,
   "start_distance_m": 5060.0,
   "end_distance_m": 5062.0,
   "midpoint_distance_m": 5061.0,
   "start_elevation_m": 503.9226997528498,
   "end_elevation_m": 504.38200421618507,
   "start_xy": [
    667071.4582045522,
    4884147.613909817
   ],
   "end_xy": [
    667069.6380757779,
    4884148.442163258
   ]
  },
  "max_3m": {
   "gradient_pct": 22.02671121260285,
   "start_distance_m": 6040.0,
   "end_distance_m": 6043.0,
   "midpoint_distance_m": 6041.5,
   "start_elevation_m": 654.049782269828,
   "end_elevation_m": 654.7105836062061,
   "start_xy": [
    666299.9511777186,
    4884503.715535369
   ],
   "end_xy": [
    666297.0730381401,
    4884502.869182861
   ]
  }
 },
 "diagnostic_note": "Windows <=3 m are at raster-noise scale (1-sigma raster noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
 "quality_summary": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.334,
   "obstruction_max_height_m": 29.0,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "sample_interval_m": 1.0,
  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
   5.0,
   10.0,
   20.0,
   25.0,
   50.0,
   100.0
  ],
  "diagnostic_windows_m": [
   2.0,
   3.0
  ],
  "elevation_crs": "EPSG:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x66y489_VT_Statewide_A23.tif",
   "data/cache/usa/vt/USGS_1M_18_x67y489_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-22T09:28:17+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_ids": [
   1314047843,
   19729533,
   28449693,
   193023669,
   624422272
  ],
  "osm_versions": {
   "1314047843": 2,
   "19729533": 17,
   "28449693": 9,
   "193023669": 8,
   "624422272": 3
  },
  "osm_timestamps": {
   "1314047843": "2026-04-25 17:48:53+00:00",
   "19729533": "2026-04-25 17:48:53+00:00",
   "28449693": "2026-04-25 17:48:53+00:00",
   "193023669": "2026-04-25 17:48:53+00:00",
   "624422272": "2026-05-21 12:55:39+00:00"
  },
  "osm_retrieved_at": "2026-08-22T09:27:32+00:00",
  "osm_pbf_path": "data/cache/pbf/vermont-260821.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "elevation_provider": "USGS 3DEP (The National Map)",
  "elevation_licence": "Public domain \u2014 USGS 3DEP 1 m DEM, courtesy of the U.S. Geological Survey",
  "elevation_dataset": "USGS 3DEP 1 m DEM, VT_Statewide_A23 (collected 2023)",
  "elevation_tile_ids": [
   "x66y489",
   "x67y489"
  ],
  "route_summit_trim_m": 860.1,
  "route_summit_trim_loss_m": 127.8,
  "climb_origin": "named",
  "notes": "\"Steepest paved mile in America\" folklore; golden-test anchor (the golden fixture pins the top 1,910 m paved section and is unaffected by extent). Full climb from Warren village per Peter 2026-08-22: lower 3,981 m asphalt + 1,447 m compacted (VTrans: Paved/Gravel) before the paved top \u2014 mixed-surface label, unranked per settled policy. Seasonal closure Oct 15-May 15.",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_2_A23",
   "ept_crs": "EPSG:3857",
   "station_coverage": 1.0,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Vermont",
  "county": ""
 }
}