Jefferson Notch Road (north side)
8528.0 m · net rise 496.8 m · total ascent 568.8 m · overall 5.8% · confidence: good · New Hampshire · share
Shape: sustained — 38% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 192 m.
Not yet matched against documented climbs — the measurement stands on its own.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈56% | 7918–7920 m | under overhead cover terrain reads 115.5% at 4334–4336 m across a structure — excluded |
| 3 m (diagnostic) | ≈46% | 7918–7921 m | under overhead cover terrain reads 92.3% at 4333–4336 m across a structure — excluded |
| 5 m | ≈39% | 945–950 m | under overhead cover terrain reads 60.0% at 4574–4579 m across a structure — excluded |
| 10 m | ≈29% | 941–951 m | under overhead cover terrain reads 32.8% at 4574–4584 m across a structure — excluded |
| 20 m | 20.7% | 934–954 m | |
| 25 m | 19.4% | 7807–7832 m | |
| 50 m | ≈17.3% | 7168–7218 m | under overhead cover terrain reads 18.0% at 7726–7776 m across a structure — excluded |
| 100 m | ≈14.9% | 7642–7742 m | under overhead cover terrain reads 15.7% at 7730–7830 m across a structure — excluded |
Map
Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · OSM way 1237911045 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.
Ridden it, or know better? Submit data for this climb no account needed · Share this climb
© 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:26919",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/usa/nh/USGS_one_meter_x30y492_NH_CT_RiverNorthL6_2015.tif",
"data/cache/usa/nh/USGS_one_meter_x31y491_NH_CT_RiverNorthL6_2015.tif",
"data/cache/usa/nh/USGS_one_meter_x31y492_NH_CT_RiverNorthL6_2015.tif"
],
"calculated_at": "2026-08-22T17:12:17+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_ids": [
1237911045,
761027510,
846995948,
1004198262,
1004198263,
1004198260,
1004198261,
1004198252,
1004198255,
1004198254,
1004198253,
1004198256,
1004198259,
1004198258,
1004198257,
18846225
],
"osm_versions": {
"1237911045": 1,
"761027510": 6,
"846995948": 5,
"1004198262": 2,
"1004198263": 1,
"1004198260": 2,
"1004198261": 1,
"1004198252": 2,
"1004198255": 2,
"1004198254": 2,
"1004198253": 1,
"1004198256": 2,
"1004198259": 2,
"1004198258": 2,
"1004198257": 1,
"18846225": 21
},
"osm_timestamps": {
"1237911045": "2024-01-07 22:51:32+00:00",
"761027510": "2025-12-15 13:15:38+00:00",
"846995948": "2022-11-26 18:26:43+00:00",
"1004198262": "2022-11-26 18:26:43+00:00",
"1004198263": "2021-11-19 03:39:37+00:00",
"1004198260": "2022-11-26 18:26:43+00:00",
"1004198261": "2021-11-19 03:39:37+00:00",
"1004198252": "2022-11-26 18:26:43+00:00",
"1004198255": "2022-11-26 18:26:43+00:00",
"1004198254": "2022-11-26 18:26:43+00:00",
"1004198253": "2021-11-19 03:39:37+00:00",
"1004198256": "2022-11-26 18:26:43+00:00",
"1004198259": "2022-11-26 18:26:43+00:00",
"1004198258": "2022-11-26 18:26:43+00:00",
"1004198257": "2021-11-19 03:39:37+00:00",
"18846225": "2026-06-26 14:25:55+00:00"
},
"osm_retrieved_at": "2026-08-22T17:12:16+00:00",
"osm_pbf_path": "data/cache/pbf/new-hampshire-260822.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, NH_CT_RiverNorthL6_2015 (collected 2015)",
"elevation_tile_ids": [
"x30y492",
"x31y491",
"x31y492"
],
"route_summit_trim_m": 3549.5,
"route_summit_trim_loss_m": 233.0,
"climb_origin": "named",
"notes": "Gravel; Jefferson/Valley Road side to the notch, full side. Way 18846225 (shared with the south entry - it crosses the notch and carries the notch-side 2.9 km of the north approach) appended 2026-08-22; summit_trim cuts its south-side descent. Served by NH_CT_RiverNorthL6_2015. review_confirmed (Peter 2026-08-22): the 5-vs-10 m divergence at 941-951 m is a coherent monotone +3.6 m ramp over 17 m (7 stations at 24-44%), a real short gravel pitch \u2014 no artifact signature.",
"canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing.html"
}