Baldwin Street
449.3 m · net rise 78.1 m · overall 17.4% · evidence quality A (high) · Otago · Otago · share
Shape: sustained — 44% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 235 m.
Matches: Guinness World Records — Steepest street (road), Dunedin — 34.8%, verified 2019-11-07.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | 35% | 283–285 m | |
| 3 m (diagnostic) | 35% | 282–285 m | |
| 5 m | 35% | 289–294 m | |
| 10 m | 35% | 288–298 m | |
| 20 m | 34.6% | 281–301 m | |
| 25 m | 34.5% | 281–306 m | |
| 50 m | 33.6% | 271–321 m | |
| 100 m | 31.0% | 225–325 m |
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 LINZ Topo50 road centrelines.
Access: Listed 2026-09-28 (inventory hunt wave 1): road audit — way 652298335: unnamed service way. Never silently ranked or dropped (Peter, 2026-08-27).
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%
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
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 | LINZ nz-elevation — New Zealand 1 m DEM/DSM national LiDAR mosaic — Toitū Te Whenua Land Information New Zealand (LINZ), vertical datum NZVD2016 (LINZ documentation; not re-verified against a benchmark) |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:2193; sampled every 1.0 m, bilinear interpolation |
| Tiles | CE17 |
| Road centreline | OpenStreetMap (local PBF extract) |
| Quality status | evidence quality A; no review flags; no caveated windows |
| Analysis | OCL 0.1.0, analysis 0.1.0, run nz-s2, calculated 2026-09-28 |
Provenance
{
"analysis_version": "0.1.0",
"run_manifest": {
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"python": "3.14.4",
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"elevation_provider_key": "nz-linz",
"tile_index": "stac",
"authority": "linz",
"registry_pbf": "new-zealand-2026-09-26.osm.pbf",
"tile_index_snapshot": "sha256:996c8a61eaf9687f"
},
"sample_interval_m": 1.0,
"interpolation": "bilinear",
"smoothing": "none",
"gradient_windows_m": [
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"diagnostic_windows_m": [
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"elevation_crs": "EPSG:2193",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
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"calculated_at": "2026-09-28T05:30:02+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/block-batch-nz-s2.osm.pbf",
"osm_snapshot": "",
"run_id": "nz-s2",
"elevation_provider": "LINZ nz-elevation",
"elevation_licence": "CC BY 4.0 \u2014 Toit\u016b Te Whenua Land Information New Zealand \u2014 https://nz-elevation.s3.ap-southeast-2.amazonaws.com/LICENSE",
"elevation_dataset": "New Zealand 1 m DEM/DSM national LiDAR mosaic \u2014 Toit\u016b Te Whenua Land Information New Zealand (LINZ), vertical datum NZVD2016 (LINZ documentation; not re-verified against a benchmark)",
"elevation_tile_ids": [
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],
"climb_origin": "discovered",
"seam_filled_samples": {
"count": 0,
"distances_m": []
},
"seam_filled_in_maximum": false,
"structure_own_ways": 4,
"carriageway": {
"stations": 24,
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"width_median_m": 8.5,
"width_p10_m": 5.4,
"width_min_m": 3.0,
"width_max_m": 12.0,
"bounded_share": 0.042,
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"width_at_max25_m": 9.75,
"window_stations": 7,
"single_track": false,
"single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
"status": "ok",
"source": "dtm",
"station_m": 25.0,
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"hedge_to_hedge": {
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}
},
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing"
}