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Paved · listed, not ranked

2959.2 m · net rise 206.4 m · total ascent 226.5 m · overall 7.0% · evidence quality B (good) · Berneck · St. Gallen

Shape: sustained — 34% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 101 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 swisstopo’s swissTLM3D road model, OpenStreetMap and a second terrain model, 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.

Taastrasse (Berneck, St. Gallen) is 2959.2 m long at 7.0% overall; its steepest 25 m averages ≈20.4% and its steepest 100 m ≈14.5%, measured from swisstopo's swissALTI3D 0.5 m LiDAR along the mapped road centreline.

Gradient ladder what do windows mean?

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.

Surface: paved throughout, according to swisstopo's swissTLM3D road model.

Pending human review: the road authority dates the link under the steepest windows (1524–1549 m) 2022-06-15, after the laser survey (2020-12-31). The terrain model may read the ground before the road was built or rebuilt: over those windows its gradient differs from the authority's own heights by 10.3 pp (mean height difference -1.0 m). The authority's heights are a witness, not a measurement — nothing has been replaced and the figure is published as measured, but a road newer than the survey is listed, not ranked, until a person has looked.

Access: Listed 2026-09-11 (Switzerland run 7): road audit — way 1365704482: unnamed service way; way 1365704482: service way, surface untagged. Never silently ranked or dropped.

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

Load the interactive map

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

Route line = the road surface as the LiDAR survey finds it. Basemap roads are for orientation and may sit a few metres off.

Topo (contours) Vector Aerial   © OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap · aerial imagery © swisstopo

Profile

The map, 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).

 

Measurement card

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:2056",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
    "data/cache/ch/swissalti3d_2020_2761-1254_0.5_2056_5728.tif",
    "data/cache/ch/swissalti3d_2020_2762-1254_0.5_2056_5728.tif",
    "data/cache/ch/swissalti3d_2020_2762-1255_0.5_2056_5728.tif",
    "data/cache/ch/swissalti3d_2020_2763-1254_0.5_2056_5728.tif",
    "data/cache/ch/swissalti3d_2020_2763-1255_0.5_2056_5728.tif"
  ],
  "calculated_at": "2026-09-11T03:46:47+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/switzerland-2026-09-10-batch.osm.pbf",
  "osm_snapshot": "",
  "run_id": "ch-run7-260911",
  "elevation_provider": "swisstopo swissALTI3D",
  "elevation_licence": "swisstopo open government data (OGD): free use, attribution '\u00a9 swisstopo' \u2014 https://www.swisstopo.admin.ch/en/terms-and-conditions",
  "elevation_dataset": "swissALTI3D 0.5 m DTM (Federal Office of Topography swisstopo)",
  "elevation_tile_ids": [
    "2761-1254",
    "2762-1254",
    "2762-1255",
    "2763-1254",
    "2763-1255"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing",
  "authority_witness": {
    "status": "ran",
    "detector": "authority-witness-vintage",
    "authority": "swisstlm3d",
    "flight_date": "2020-12-31",
    "flagged_windows_m": [
      25
    ],
    "thresholds": {
      "gradient_diff_pp": 8.0,
      "mean_dz_m": 3.0
    },
    "windows": [
      {
        "window_m": 25,
        "start_m": 1524.0,
        "end_m": 1549.0,
        "gradient_dtm_pct": 20.43,
        "covered_share": 1.0,
        "newer_share": 0.69,
        "links": [
          "tlm-125035 (2022-06-15)",
          "tlm-17309 (2002-07-01)",
          "tlm-2043532 (2022-06-15)"
        ],
        "gradient_authority_pct": 10.15,
        "gradient_dtm_same_span_pct": 20.21,
        "delta_pp": 10.28,
        "mean_dz_m": -1.02,
        "max_abs_dz_m": 1.92,
        "flagged": true,
        "why": "newer link and the terrain model disagrees with its Z"
      }
    ],
    "caveat": "road built or rebuilt after the laser survey \u2014 the terrain model may read the ground before construction"
  }
}