Lewes Golf Club
680.1 m · net rise 75.1 m · total ascent 76.4 m · overall 11.0% · evidence quality B (good) · Lewes · East Sussex · share
Shape: sustained — 40% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 165 m.
Documented on the ground — sign: 17% (2014). Signs get repainted and tags get retagged, so the date is part of the fact; not yet matched against any cycling list.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈37% | 190–192 m | under overhead cover terrain reads 73.8% at 88–90 m across a structure — excluded |
| 3 m (diagnostic) | ≈36% | 189–192 m | under overhead cover terrain reads 73.9% at 88–91 m across a structure — excluded |
| 5 m | ≈36% | 187–192 m | under overhead cover terrain reads 63.3% at 86–91 m across a structure — excluded |
| 10 m | ≈31% | 182–192 m | under overhead cover terrain reads 42.1% at 86–96 m across a structure — excluded |
| 20 m | ≈27.2% | 182–202 m | under overhead cover terrain reads 29.9% at 85–105 m across a structure — excluded |
| 25 m | ≈26.1% | 179–204 m | under overhead cover terrain reads 26.8% at 85–110 m across a structure — excluded |
| 50 m | 22.7% | 155–205 m | |
| 100 m | ≈18.7% | 110–210 m | under overhead cover terrain reads 19.1% at 86–186 m across a structure — excluded |
Map
Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · geojson.io our exact measured line · OpenTopoMap
No aerial layer here: Britain has no open or government source of aerial photography at road scale — the pan-government APGB imagery is licensed to the public sector only, unlike the LiDAR this survey is measured from. Street View, where it exists, is the visual check.
This climb's data: OCL JSON — the full gradient ladder, quality flags and provenance in the OpenClimb Ladder format.
Access: Held from rankings 2026-09-04 (D21 D, hidden-steeper re-line): on the bench the EA point cloud finds the page reads below every door, but the cloud cannot vouch for that line under its maximum — neither ranked nor retired until a cross-section look. Published number stands. Also note — Signed access on the upper section (Street View, Jul 2024): "Private Road — Golfers Only" and "Public Footpath Only" where the lane approaches Lewes Golf Club, with speed bumps; the lower section (Chapel Hill) is a public 20-mph street with a 17% gradient warning. Cyclists are seen riding the lane in earlier imagery (May 2014) — rights on the upper stretch are unclear; check on the ground.
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
Route colour = gradient over a 25 m window: <10% 10–20% 20–25% ≥25%
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
Profile
The profile and gradient chart share one position — move your pointer over them and the marker follows. Colors are the gradient bands; the shaded span is the steepest 25 m. Any 25 m figure is good to about a point either way (why).
Reported values vs. measurement
| Source | Claim | Evidence | Best-matching window |
|---|---|---|---|
| Road sign (17%) | 17% | road_sign | 100 m (-1.7 pp) |
Measurement card
| Elevation | Environment Agency — EA LIDAR Composite DTM 1m (2022) |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:27700; sampled every 1.0 m, bilinear interpolation |
| Tiles | TQ4005.tif, TQ4010.tif |
| Road centreline | OpenStreetMap (local PBF extract), snapshot 2026-08-12T20:21:46Z |
| Quality status | evidence quality B; caveated windows: canopy or structure, structure excluded |
| Analysis | OCL 0.1.0, analysis 0.1.0, run identifier not recorded (legacy measurement, before the campaign driver stamped runs), calculated 2026-08-20 |
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:27700",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/england/bulk_dtm_1m/TQ4005.tif",
"data/cache/england/bulk_dtm_1m/TQ4010.tif"
],
"calculated_at": "2026-08-20T19:25:23+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/england-2026-08-12.osm.pbf",
"osm_snapshot": "2026-08-12T20:21:46Z",
"elevation_provider": "Environment Agency",
"elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
"elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency",
"elevation_coverage_id": "13787b9a-26a4-4775-8523-806d13af58fc__Lidar_Composite_Elevation_DTM_1m",
"elevation_tile_ids": [
"TQ4005.tif",
"TQ4010.tif"
],
"climb_origin": "discovered",
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing"
}