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 · share

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.

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

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": "2026-08-19T17:33:30+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).",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
}