BETA — measurements and names under active refinement. Seen a sign, a gate, or a better name? Submit an update no account needed · photos welcome via GitHub

Discovered lane (54.1595, -6.3391)

346.0 m · net rise 28.8 m · total ascent 33.9 m · overall 8.3% · confidence: high · Newry · County Down

Shape: stepped — 47% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 78 m.

Found purely from mapping and LiDAR data, and not yet matched against books, race records or lists — it may be well known to locals under a name we've never heard. It was cross-checked against the OS road network, surface models and map tags, but 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 you know this road, tell us what you found — photographs, corrections and local knowledge all welcome; the map links below let you scout it first.

Gradient ladder what do windows mean?

Window	Maximum	Located at
2 m (diagnostic)	37%	202–204 m
3 m (diagnostic)	35%	195–198 m
5 m	34%	195–200 m
10 m	33%	195–205 m
20 m	30.4%	188–208 m
25 m	28.9%	185–210 m
50 m	23.5%	160–210 m
100 m	16.7%	146–246 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.

Ridden it, or know better? Submit data for this climb no account needed

Discovered lane (54.1595, -6.3391) LiDAR hillshade map with contours

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:29902",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
    "data/cache/ni/newry-2010/dtm/308324.asc"
  ],
  "calculated_at": "2026-08-19T00:22:21+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "/root/ni-survey/ireland-and-northern-ireland-2026-08-18.osm.pbf",
  "osm_snapshot": "2026-08-17T20:21:36Z",
  "elevation_provider": "OpenDataNI (OSNI / DfI Rivers River Basin LiDAR)",
  "elevation_licence": "Open Government Licence v3 \u2014 Crown copyright; Belfast City 2006 data \u00a9 Cyient Europe Ltd, published as open data by DfI",
  "elevation_dataset": "OSNI/DfI Rivers River Basin LiDAR 1 m DTM \u2014 Newry (March 2010)",
  "elevation_tile_ids": [
    "308324"
  ],
  "route_summit_trim_m": 37.7,
  "route_summit_trim_loss_m": 4.1,
  "climb_origin": "discovered",
  "notes": "KEPT at seed extent: no ascending continuation (min_avg=2.0%). Adopted 2026-08-18 (NI launch set \u2014 see docs/ni-coverage-survey.md)."
}