Tideford to Hay Lake Bottom°
1409.9 m · net rise 91.8 m · total ascent 104.4 m · overall 6.5% · confidence: good · Tideford · Cornwall
Shape: stepped — 52% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 85 m.
Found purely from mapping and LiDAR data, and not yet matched against books, race records or lists — it may be well known to locals under a name we've never heard. It was cross-checked against the OS road network, surface models and map tags, but a discovery can still be an artifact of the terrain model or the map. Treat it as a well-evidenced hypothesis until someone has ridden it. If you know this road, tell us what you found — photographs, corrections and local knowledge all welcome; the map links below let you scout it first.
° The name is provisional: this climb is not yet matched to a documented name, so it was named from nearby map places. There is no evidence of local usage — (auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.4276, -4.3187)'). Corrections welcome.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈43% | 469–471 m | under overhead cover terrain reads 62.1% at 741–743 m across a structure — excluded |
| 3 m (diagnostic) | ≈36% | 227–230 m | under overhead cover terrain reads 50.3% at 741–744 m across a structure — excluded |
| 5 m | ≈33% | 225–230 m | under overhead cover terrain reads 39.6% at 748–753 m across a structure — excluded |
| 10 m | ≈28% | 219–229 m | under overhead cover terrain reads 29.5% at 741–751 m across a structure — excluded |
| 20 m | ≈24.0% | 210–230 m | under overhead cover terrain reads 24.2% at 736–756 m across a structure — excluded |
| 25 m | 24.4% | 204–229 m | |
| 50 m | 20.5% | 180–230 m | |
| 100 m | 18.5% | 173–273 m |
may_start_earlier 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 · 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.
Ridden it, or know better? Submit data for this climb no account needed
© 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:27700",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/england/bulk_dtm_1m/SX3560.tif"
],
"calculated_at": "2026-08-15T00:20:05+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.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": [
"SX3560.tif"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 15.0% over 200 m (Terrain 50), gain 87.0 m over 1391 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.4276, -4.3187)'"
}