Waipio Valley Road
1210.1 m · net rise 265.3 m · total ascent 292.5 m · overall 21.9% · evidence quality B (good) · Honokaa-Kukuihaele · Hawaii · share
Shape: sustained — 30% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 629 m.
Matches: Wikipedia — Waipiʻo Valley Road — has its own coverage (Waipiʻo Valley article; 25% grade, 4WD only).
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈51% | 517–519 m | under overhead cover terrain reads 115.8% at 416–418 m across a structure and ground that holds no carriageway surface at the route line (sunken, walled or sharply embanked) — excluded |
| 3 m (diagnostic) | ≈49% | 385–388 m | under overhead cover terrain reads 111.3% at 416–419 m across a structure — excluded |
| 5 m | ≈40% | 9–14 m | under overhead cover terrain reads 88.3% at 415–420 m across a structure — excluded |
| 10 m | ≈35% | 9–19 m | under overhead cover terrain reads 79.1% at 33–43 m across a structure — excluded |
| 20 m | ≈29.4% | 953–973 m | under overhead cover terrain reads 62.4% at 24–44 m across a structure — excluded |
| 25 m | ≈28.9% | 948–973 m | under overhead cover terrain reads 57.7% at 28–53 m across a structure — excluded |
| 50 m | ≈28.4% | 700–750 m | under overhead cover terrain reads 46.3% at 15–65 m across a structure — excluded |
| 100 m | ≈26.8% | 665–765 m | under overhead cover terrain reads 33.3% at 365–465 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.
Access: Listed 2026-09-11 (fame door, Peter 2026-09-11), never ranked. Waipiʻo Valley Road is the famous 4WD-only county road into Waipiʻo Valley (Hawaii County class A41); Hawaii County closed it to non-resident vehicles in February 2022 and foot access is restricted. The county inventory covers 74 % of the surveyed line and the machine extent rule (D28-B) had retired it; it is published on the recognition door because people look for it. Confidence U: 21 % of the line is masked for structures and the point cloud shows no clear road bench 300-475 m. Published figures for this road range from 25 % (Wikipedia) to 45 % (travel lists); no 25 m window on the surveyed line reaches 30 %.
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.
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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_Hawaii_Island_Lidar_NOAA_2017_B17 (collected 2017) |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:26905; sampled every 1.0 m, bilinear interpolation |
| Tiles | x22y223 |
| Road centreline | OpenStreetMap (local PBF extract), snapshot 2026-09-07T20:21:20Z |
| Quality status | evidence quality B; caveated windows: placement excluded, 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:26905",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/usa/hi-east/USGS_1M_5_x22y223_HI_Hawaii_Island_Lidar_NOAA_2017_B17.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_Hawaii_Island_Lidar_NOAA_2017_B17 (collected 2017)",
"elevation_tile_ids": [
"x22y223"
],
"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"
}