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Hay on Wye to Mynydd Brith°

6041.9 m · net rise 331.7 m · total ascent 351.0 m · overall 5.5% · confidence: high · Scudamore Dingle · County of Herefordshire

Shape: sustained — 44% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 188 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 (52.0661, -3.0870)'). Corrections welcome.

Gradient ladder what do windows mean?

WindowMaximumLocated at
2 m (diagnostic)29%2657–2659 m
3 m (diagnostic)27%2025–2028 m
5 m24%2025–2030 m
10 m21%2360–2370 m
20 m20.8%2347–2367 m
25 m20.8%2347–2372 m
50 m19.3%2322–2372 m
100 m17.6%2302–2402 m

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

Hay on Wye to Mynydd Brith LiDAR hillshade map with contours

Profile

Hay on Wye to Mynydd Brith elevation profile Hay on Wye to Mynydd Brith rolling gradient 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/SO2035.tif",
    "data/cache/england/bulk_dtm_1m/SO2535.tif",
    "data/cache/england/bulk_dtm_1m/SO2040.tif",
    "data/cache/england/bulk_dtm_1m/SO2540.tif"
  ],
  "calculated_at": "2026-08-15T12:38:18+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": [
    "SO2035.tif",
    "SO2535.tif",
    "SO2040.tif",
    "SO2540.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.3% over 200 m (Terrain 50), gain 313.4 m over 5557 m way. EXTENDED by graph walk: +3 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 (52.0661, -3.0870)'"
}