Gravel / dirt track · listed, not ranked
788.5 m · net rise 60.7 m · total ascent 66.2 m · overall 7.7% · evidence quality B (good) · Mellau · Vorarlberg
Shape: sustained — 43% 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 the GIP.at road network, 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.
≈ Overhead cover (tree canopy or structures) spans 10% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain — the flag does not say whether the true value is higher or lower. Longer windows average over more clean ground and are steadier.
Hintersuttis (Mellau, Vorarlberg) is 788.5 m long at 7.7% overall; its steepest 25 m averages ≈19.7% and its steepest 100 m ≈14.7%, measured from Austria's national 1 m airborne-laser terrain model along the mapped road centreline.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈28% | 20–22 m | under overhead cover terrain reads 31.9% at 476–478 m across a structure — excluded |
| 3 m (diagnostic) | ≈27% | 19–22 m | under overhead cover terrain reads 30.2% at 479–482 m across a structure — excluded |
| 5 m | ≈25% | 92–97 m | under overhead cover terrain reads 30.0% at 477–482 m across a structure — excluded |
| 10 m | ≈23% | 87–97 m | under overhead cover terrain reads 29.2% at 472–482 m across a structure — excluded |
| 20 m | ≈20.1% | 87–107 m | under overhead cover terrain reads 25.6% at 462–482 m across a structure — excluded |
| 25 m | ≈19.7% | 83–108 m | under overhead cover terrain reads 23.9% at 458–483 m across a structure — excluded |
| 50 m | ≈15.8% | 518–568 m | under overhead cover terrain reads 18.6% at 434–484 m across a structure — excluded |
| 100 m | ≈14.7% | 489–589 m | under overhead cover terrain reads 16.3% at 456–556 m across a structure — excluded |
may start earliermay continue beyond end 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: unpaved throughout, according to GIP.at, Austria's official transport graph.
Pending human review: the steepest stretch of this climb (458–483 m) looks like a track rather than a made road: the way under it is mapped as a rough farm or forest track (track grade 3 to 5) (about 100% of the steepest 25 m and 100% of the line). The figure is published as measured and has not been adjusted, but a climb whose steepest stretch looks like a track is listed, not ranked, until a person has looked.
Access: Listed 2026-10-07 (no_door: edition fusion: the 25 m maximum on the two-edition figure clears no ranking door): clears no ranking door at its figure; listed, not ranked (D8).
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%
Route line = the road surface as the LiDAR survey finds it. Basemap roads are for orientation and may sit a few metres off.
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap · aerial imagery © basemap.at (CC BY 4.0)
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
| Elevation | BEV ALS DTM 1 m — ALS DTM Höhenraster 1 m (Bundesamt für Eich- und Vermessungswesen with the Länder), EPSG:3035 |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:3035; sampled every 1.0 m, bilinear interpolation |
| Tiles | E4309-N2688, E4309-N2689, E4310-N2688, E4310-N2689 |
| Road centreline | OpenStreetMap (local PBF extract) |
| Quality status | evidence quality B; caveated windows: texture excluded |
| Analysis | OCL 0.1.0, analysis 0.1.0, run ef261007-fus-mean-at2, calculated 2026-10-07 |
Provenance
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"calculated_at": "2026-10-07T13:16:11+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "output/ef261007-fus-mean-at2/at/batch-austria-chunk043.pbf",
"osm_snapshot": "",
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"edition_pin": {
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"elevation_provider": "BEV ALS DTM 1 m",
"elevation_licence": "Creative Commons Attribution 4.0 (CC BY 4.0) \u2014 \u00a9 BEV / L\u00e4nder, data.gv.at",
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"bev_dsm_release": {
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"climb_origin": "discovered",
"seam_filled_samples": {
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"distances_m": []
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"seam_filled_in_maximum": false,
"edition_fusion": {
"method": "mean",
"method_version": "edition-fusion-1.0",
"class": "agree-mean",
"sources": [
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"role": "older (shifted onto the newer datum)",
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"edition": "BEV 2022-09-15",
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"weights": {
"older": 0.5,
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"datum": "newer edition",
"datum_offset_m": -0.0309,
"disagreement": {
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"window_start_m": 83.0,
"gradient_older_pct": 19.431,
"gradient_newer_pct": 19.875,
"gradient_difference_pp": 0.444,
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"field": "quality_summary.overhead_obstruction.flagged_windows_m / obstructed_fraction"
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"error_basis": "edition-fusion-study-261007 step 2: three-cornered hat over 71 independent triples (65 at): older edition 2.4 cm, newer 2.8 cm robust sigma, effectively equal; mean beat newest on 66 % and oldest on 85 % of 65 at pages",
"published_max25_pct": 23.1,
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"ruling": "(chat, 'yes, go ahead with 1-3'), edition fusion study",
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"structure_own_ways": "none \u2014 the route carried no way list and no mapped way runs along it; own decks unmasked",
"tunnel_check": "unavailable \u2014 the route carried no way list and no authority tunnel spans were supplied; tunnels unchecked",
"prior_doc": {
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"spans": 0,
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"carriageway": {
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"single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
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"source": "dtm",
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}