Ualakaa Street
493.4 m · net rise 62.0 m · overall 12.6% · evidence quality B (good) · Honolulu · Hawaii · share
Shape: sustained — 35% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 252 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 state road inventory, OpenStreetMap and the point-cloud evidence for a graded road bed, 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) | ≈24% | 475–477 m | under overhead cover terrain reads 119.1% at 467–469 m across a structure — excluded |
| 3 m (diagnostic) | ≈20% | 247–250 m | under overhead cover terrain reads 102.5% at 467–470 m across a structure — excluded |
| 5 m | ≈20% | 245–250 m | under overhead cover terrain reads 77.8% at 466–471 m across a structure — excluded |
| 10 m | ≈19% | 245–255 m | under overhead cover terrain reads 43.5% at 461–471 m across a structure — excluded |
| 20 m | ≈19.0% | 234–254 m | under overhead cover terrain reads 31.8% at 450–470 m across a structure — excluded |
| 25 m | ≈19.0% | 230–255 m | under overhead cover terrain reads 30.4% at 445–470 m across a structure — excluded |
| 50 m | ≈18.7% | 224–274 m | under overhead cover terrain reads 22.0% at 430–480 m across a structure — excluded |
| 100 m | 18.2% | 203–303 m |
may 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.
Access: Listed 2026-09-11 (texture re-measure): with the step masked the steepest 25 m reads 19.0 %, below the ranking door — kept as a listed page. Also held 2026-09-15 (driveway-at-window, US detector sweep): the steepest 25 m (19.0 %, at 230 m) meets OSM service (driveway) way 487541439, 0.0 m from the window, and the window sits 20.0 m off the inventory line — the maximum may be the driveway, not the road. Out of the rankings until a person rules.
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 · aerial imagery USGS (public domain)
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 | USGS 3DEP (The National Map) — USGS 3DEP 1 m DEM, HI_NOAAMauiOahu_2020_B20 (collected 2020) |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:26904; sampled every 1.0 m, bilinear interpolation |
| Tiles | x62y236 |
| Road centreline | OpenStreetMap (local PBF extract), snapshot 2026-09-07T20:21:20Z |
| Quality status | evidence quality B; caveated windows: structure excluded, texture excluded |
| Analysis | OCL 0.1.0, analysis 0.1.0, run texture-us-hi-260911, calculated 2026-09-11 |
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:26904",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/usa/hi/USGS_1M_4_x62y236_HI_NOAAMauiOahu_2020_B20.tif"
],
"calculated_at": "2026-09-11T23:12:24+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/hawaii-2026-09-08-batch.osm.pbf",
"osm_snapshot": "2026-09-07T20:21:20Z",
"run_id": "texture-us-hi-260911",
"elevation_provider": "USGS 3DEP (The National Map)",
"elevation_licence": "Public domain \u2014 USGS 3DEP 1 m DEM, courtesy of the U.S. Geological Survey",
"elevation_dataset": "USGS 3DEP 1 m DEM, HI_NOAAMauiOahu_2020_B20 (collected 2020)",
"elevation_tile_ids": [
"x62y236"
],
"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"
}