Crimea Pass (Bwlch y Gorddinan)
2704.9 m · net rise 260.1 m · total ascent 262.2 m · overall 9.6% · confidence: needs confirmation · Blaenau Ffestiniog · Gwynedd · share
Shape: sustained — 33% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 525 m.
Matches: Wikipedia, Simon Warren 100 Climbs app (Wales collections) — Crimea Pass (Bwlch y Gorddinan) — articles in English and Welsh — Crimea Pass — listed unnumbered; Wales-volume/X-List attribution to confirm in-app.
needs review short_window_divergence — treat short-window maxima here as provisional.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈39% | 30–32 m | under overhead cover terrain reads 122.0% at 21–23 m across a structure — excluded |
| 3 m (diagnostic) | ≈38% | 29–32 m | under overhead cover terrain reads 122.0% at 21–24 m across a structure — excluded |
| 5 m | ≈35% | 28–33 m | under overhead cover terrain reads 111.5% at 20–25 m across a structure — excluded |
| 10 m | ≈26% | 28–38 m | under overhead cover terrain reads 73.6% at 19–29 m across a structure — excluded |
| 20 m | ≈19.3% | 1912–1932 m | under overhead cover terrain reads 48.6% at 19–39 m across a structure — excluded |
| 25 m | ≈18.4% | 1907–1932 m | under overhead cover terrain reads 40.0% at 19–44 m across a structure — excluded |
| 50 m | ≈17.7% | 2036–2086 m | under overhead cover terrain reads 23.4% at 19–69 m across a structure — excluded |
| 100 m | 17.2% | 1997–2097 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.
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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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_17_269348_20210330dtm.tif",
"data/cache/wales/dtm_1m/wg_del_17_270348_20210330dtm.tif",
"data/cache/wales/dtm_1m/wg_del_20_269346_20220111dtm.tif",
"data/cache/wales/dtm_1m/wg_del_20_269347_20220111dtm.tif",
"data/cache/wales/dtm_1m/wg_del_20_270346_20220111dtm.tif",
"data/cache/wales/dtm_1m/wg_del_20_270347_20220111dtm.tif"
],
"calculated_at": "2026-08-12T23:12:05+00:00",
"road_source": "trunk-adopted-routes/discovered-lane-53-0055-3-9425.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_17_269348_20210330dtm.tif",
"wg_del_17_270348_20210330dtm.tif",
"wg_del_20_269346_20220111dtm.tif",
"wg_del_20_269347_20220111dtm.tif",
"wg_del_20_270346_20220111dtm.tif",
"wg_del_20_270347_20220111dtm.tif"
],
"elevation_capture_dates": [
"11-01-2022",
"30-03-2021"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 12.7% over 200 m (Terrain 50), gain 52.5 m over 517 m way. EXTENDED by graph walk: +0 segment(s) at base, +8 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (window-flag adjudication, Peter's Street View verdict 2026-08-12): long steady grade, no crossing structures \u2014 the 2-25 m window flags are DTM artifacts on a real climb; see road-review-verdicts.yaml. NAMED by human review. Absorbs discovered-lane-53-0154-3-9441 (95% route containment) and twin seed discovered-lane-53-0105-3-9451 (identical chain).",
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing.html"
}