Moel Cwm yr Eglwys to Bwlch Oerddrws°
2226.9 m · net rise 191.3 m · total ascent 196.2 m · overall 8.6% · confidence: high · Cwm Cerist · Gwynedd · share
Shape: sustained — 34% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 362 m.
Matches: Wikipedia — Bwlch yr Oerddrws — Welsh Wikipedia article on the pass; this is the western ascent.
° 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 (52.7360, -3.7686)'). Corrections welcome.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | 19% | 1792–1794 m | |
| 3 m (diagnostic) | 18% | 1895–1898 m | |
| 5 m | 18% | 1894–1899 m | |
| 10 m | 18% | 1890–1900 m | |
| 20 m | 16.8% | 1887–1907 m | |
| 25 m | 16.5% | 1887–1912 m | |
| 50 m | 15.1% | 1874–1924 m | |
| 100 m | 14.9% | 574–674 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.
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:27700",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/wales/dtm_1m/wg_del_22_280316_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_280317_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_281316_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_281317_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_282316_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_282317_20220114dtm.tif"
],
"calculated_at": "2026-08-12T23:11:57+00:00",
"road_source": "trunk-adopted-routes/discovered-lane-52-7360-3-7686.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_22_280316_20220114dtm.tif",
"wg_del_22_280317_20220114dtm.tif",
"wg_del_22_281316_20220114dtm.tif",
"wg_del_22_281317_20220114dtm.tif",
"wg_del_22_282316_20220114dtm.tif",
"wg_del_22_282317_20220114dtm.tif"
],
"elevation_capture_dates": [
"14-01-2022"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 13.8% over 200 m (Terrain 50), gain 173.4 m over 1893 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 (52.7360, -3.7686)'.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.7360, -3.7686)'",
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing.html"
}