Minffordd to Cwm Rhwyddfor°
2505.1 m · net rise 147.7 m · total ascent 150.0 m · overall 5.9% · confidence: high · Minffordd · Gwynedd · share
Shape: sustained — 30% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 25 m.
Matches: Wikipedia, Simon Warren 100 Climbs app (Wales collections) — Bwlch Llyn Bach (Tal-y-llyn pass) — Welsh Wikipedia article; route passes 40 m from the pass point — Bwlch Llyn Bach — listed unnumbered; attribution to confirm in-app.
° 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 (52.6963, -3.8596)'). Corrections welcome.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | 25% | 1915–1917 m | |
| 3 m (diagnostic) | 24% | 1915–1918 m | |
| 5 m | 18% | 346–351 m | |
| 10 m | 16% | 345–355 m | |
| 20 m | 12.8% | 345–365 m | |
| 25 m | 12.0% | 345–370 m | |
| 50 m | 10.6% | 307–357 m | |
| 100 m | 9.9% | 272–372 m |
may_continue_beyond_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.
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.
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© 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_273311_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_273312_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_273313_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_274311_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_274312_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_274313_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_275311_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_275312_20220114dtm.tif",
"data/cache/wales/dtm_1m/wg_del_22_275313_20220114dtm.tif"
],
"calculated_at": "2026-08-12T23:12:13+00:00",
"road_source": "trunk-adopted-routes/discovered-lane-52-6963-3-8596.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_273311_20220114dtm.tif",
"wg_del_22_273312_20220114dtm.tif",
"wg_del_22_273313_20220114dtm.tif",
"wg_del_22_274311_20220114dtm.tif",
"wg_del_22_274312_20220114dtm.tif",
"wg_del_22_274313_20220114dtm.tif",
"wg_del_22_275311_20220114dtm.tif",
"wg_del_22_275312_20220114dtm.tif",
"wg_del_22_275313_20220114dtm.tif"
],
"elevation_capture_dates": [
"14-01-2022"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 10.2% over 200 m (Terrain 50), gain 127.1 m over 2135 m way. EXTENDED by graph walk: +1 segment(s) at base, +1 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 (52.6963, -3.8596)'.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.6963, -3.8596)'",
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing.html"
}