LIVING SURVEY — measurements are reviewed continuously as new data and local evidence arrive. Seen a sign, a gate, or a better name? Submit an update no account needed · photos welcome via GitHub

Padarn Crescent

220.5 m · net rise 10.6 m · total ascent 13.4 m · overall 4.8% · evidence quality A (high) · Aberystwyth · Dyfed · share

Shape: stepped — 60% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 51 m.

Documented on the ground — sign: 16% (2024). Signs get repainted and tags get retagged, so the date is part of the fact; not yet matched against any cycling list.

Gradient ladder what do windows mean?

Window	Maximum	Located at
2 m (diagnostic)	24%	8–10 m
3 m (diagnostic)	23%	7–10 m
5 m	22%	7–12 m
10 m	21%	7–17 m
20 m	19.6%	7–27 m
25 m	19.3%	7–32 m
50 m	15.7%	3–53 m
100 m	8.7%	3–103 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

No aerial layer here: Britain has no open or government source of aerial photography at road scale — the pan-government APGB imagery is licensed to the public sector only, unlike the LiDAR this survey is measured from. Street View, where it exists, is the visual check.

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

Route colour = gradient over a 25 m window: <10% 10–20% 20–25% ≥25%

Padarn Crescent LiDAR hillshade map with contours

Profile

The profile and gradient chart share one position — move your pointer over them and the marker follows. Colors are the gradient bands; the shaded span is the steepest 25 m. Any 25 m figure is good to about a point either way (why).

Reported values vs. measurement

Source	Claim	Evidence	Best-matching window
Road sign (Padarn Crescent at Quebec Road)	16%	road_sign	50 m (+0.3 pp)

Measurement card

Elevation	Welsh Government — Welsh Government LiDAR 1m DTM (2020-2023)
Resolution / CRS	1.0 m grid, EPSG:27700; sampled every 1.0 m, bilinear interpolation
Tiles	wg_del_29_259281_20220319dtm.tif
Road centreline	OpenStreetMap (local PBF extract), snapshot 2026-08-10T20:21:40Z
Quality status	evidence quality A; no review flags; no caveated windows
Analysis	OCL 0.1.0, analysis 0.1.0, run identifier not recorded (legacy measurement, before the campaign driver stamped runs), calculated 2026-08-20

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_29_259281_20220319dtm.tif"
  ],
  "calculated_at": "2026-08-20T23:51:17+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
  "osm_snapshot": "2026-08-10T20:21:40Z",
  "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_29_259281_20220319dtm.tif"
  ],
  "elevation_capture_dates": [
    "19-03-2022"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
}