Ceunant Gorddinan to Ffridd-y-Bwlch°
2563.2 m · gain 110.4 m · overall 4.3% · Ceunant Gorddinan · Conwy
Shape: stepped — 46% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 108 m.
An unlisted find of this survey, on no list we know of. It was discovered by analysing LiDAR terrain data and cross-checked against the OS road network, surface models and map tags — but despite all that, 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 that someone is you, 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 appears on no list we know of, 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 (53.0227, -3.9374)'). Corrections welcome.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | 13.9% | 691–693 m | |
| 3 m (diagnostic) | 13.0% | 690–693 m | |
| 5 m | 12.6% | 703–708 m | |
| 10 m | 12.1% | 698–708 m | |
| 20 m | 11.8% | 690–710 m | |
| 25 m | 11.6% | 685–710 m | |
| 50 m | 11.3% | 681–731 m | |
| 100 m | 10.9% | 656–756 m |
descends_at_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 · 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.
© 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/wales/dtm_1m/wg_del_11_269350_20210302dtm.tif",
"data/cache/wales/dtm_1m/wg_del_11_270350_20210302dtm.tif",
"data/cache/wales/dtm_1m/wg_del_11_271350_20210302dtm.tif",
"data/cache/wales/dtm_1m/wg_del_17_269348_20210330dtm.tif",
"data/cache/wales/dtm_1m/wg_del_17_269349_20210302dtm.tif",
"data/cache/wales/dtm_1m/wg_del_17_270348_20210330dtm.tif",
"data/cache/wales/dtm_1m/wg_del_17_270349_20210302dtm.tif",
"data/cache/wales/dtm_1m/wg_del_17_271348_20210330dtm.tif",
"data/cache/wales/dtm_1m/wg_del_17_271349_20210302dtm.tif"
],
"calculated_at": "2026-08-12T23:12:24+00:00",
"road_source": "trunk-adopted-routes/discovered-lane-53-0227-3-9374.geojson",
"elevation_provider": "Welsh Government",
"elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
"elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
"elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
"elevation_tile_ids": [
"wg_del_11_269350_20210302dtm.tif",
"wg_del_11_270350_20210302dtm.tif",
"wg_del_11_271350_20210302dtm.tif",
"wg_del_17_269348_20210330dtm.tif",
"wg_del_17_269349_20210302dtm.tif",
"wg_del_17_270348_20210330dtm.tif",
"wg_del_17_270349_20210302dtm.tif",
"wg_del_17_271348_20210330dtm.tif",
"wg_del_17_271349_20210302dtm.tif"
],
"elevation_capture_dates": [
"02-03-2021",
"30-03-2021"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 9.3% over 200 m (Terrain 50), gain 43.3 m over 1602 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. ADOPTED (trunk sweep, Peter's on-sight verdict 2026-08-12): clean table, adopt-all. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (53.0227, -3.9374)'.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (53.0227, -3.9374)'"
}