Smugglers Notch (north side)
5298.5 m · net rise 338.2 m · total ascent 342.7 m · overall 6.4% · confidence: good · Vermont · share
Shape: sustained — 31% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 87 m.
Not yet matched against documented climbs — the measurement stands on its own.
≈ Overhead cover (tree canopy or structures) spans 16% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain — the flag does not say whether the true value is higher or lower. Longer windows average over more clean ground and are steadier.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈15% | 4868–4870 m | under overhead cover terrain reads 81.1% at 544–546 m across a structure — excluded |
| 3 m (diagnostic) | ≈15% | 4867–4870 m | under overhead cover terrain reads 79.5% at 543–546 m across a structure — excluded |
| 5 m | ≈15% | 4865–4870 m | under overhead cover terrain reads 76.4% at 541–546 m across a structure — excluded |
| 10 m | ≈15% | 4864–4874 m | under overhead cover terrain reads 61.4% at 539–549 m across a structure — excluded |
| 20 m | ≈14.3% | 4858–4878 m | under overhead cover terrain reads 34.9% at 538–558 m across a structure — excluded |
| 25 m | ≈14.1% | 4855–4880 m | under overhead cover terrain reads 29.5% at 538–563 m across a structure — excluded |
| 50 m | ≈13.4% | 4838–4888 m | under overhead cover terrain reads 18.7% at 538–588 m across a structure — excluded |
| 100 m | ≈11.8% | 4798–4898 m | under overhead cover terrain reads 13.0% at 538–638 m across a structure — excluded |
may_continue_beyond_end Extent detection suggests reviewing where this climb starts/ends.
Map
Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · OSM way 28365888 highlights the mapped road · geojson.io our exact measured line · OpenTopoMap
This climb's data: OCL JSON — the full gradient ladder, quality flags and provenance in the OpenClimb Ladder format.
Measured, not vetted. This page records what the laser record shows about the road's shape — nothing more. Nobody has necessarily ridden or inspected this road for the survey, and a page here is not a recommendation and no guarantee that the road is open, surfaced, rideable or safe. Gates, private sections, missing rights of way and hazards do not show up in elevation data. Check access and conditions on the ground and make your own judgment.
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© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
Profile
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_x67y494_VT_Statewide_A23.tif",
"data/cache/usa/vt/USGS_1M_18_x67y495_VT_Statewide_A23.tif"
],
"calculated_at": "2026-08-22T09:57:34+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_ids": [
28365888,
1238339136,
1238339135,
974797817,
1362743013,
974797816,
1362743012,
1323026519
],
"osm_versions": {
"28365888": 18,
"1238339136": 2,
"1238339135": 2,
"974797817": 7,
"1362743013": 1,
"974797816": 11,
"1362743012": 1,
"1323026519": 2
},
"osm_timestamps": {
"28365888": "2025-02-25 01:22:06+00:00",
"1238339136": "2025-02-25 01:22:06+00:00",
"1238339135": "2025-02-25 01:22:06+00:00",
"974797817": "2025-02-25 01:22:06+00:00",
"1362743013": "2025-02-25 01:36:25+00:00",
"974797816": "2025-02-25 01:36:25+00:00",
"1362743012": "2025-02-25 01:36:25+00:00",
"1323026519": "2025-02-25 01:36:25+00:00"
},
"osm_retrieved_at": "2026-08-22T09:57:33+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": [
"x67y494",
"x67y495"
],
"route_base_cut_m": 2859,
"climb_origin": "named",
"notes": "VT-108 from Jeffersonville. Seasonal winter closure. Extent completed to the Notch 2026-08-22: named-road chain (VTrans paved), end 165 m from GNIS 'Smugglers Notch' pre-trim \u2014 the previous seed stopped 2.6 km short, below the entire steep finish. NOTE: greedy walk had proposed Sterling Drive (resort service road) \u2014 rejected, ref-locked to VT 108. base_cut_m 2859 applied 2026-08-22 (ranked entries start where the climbing starts; forward-500 m >= 3% probe).",
"canopy_source": {
"kind": "ept_corridor_max_return",
"ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_1_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"
}