Henry Road
2046.0 m · net rise 113.5 m · total ascent 128.8 m · overall 5.5% · evidence quality B (good) · White · Pennsylvania · share
Shape: sustained — 40% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 159 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) | ≈30% | 1342–1344 m | under overhead cover terrain reads 49.1% at 2002–2004 m across a structure — excluded |
| 3 m (diagnostic) | ≈29% | 1341–1344 m | under overhead cover terrain reads 45.7% at 2002–2005 m across a structure — excluded |
| 5 m | ≈29% | 1339–1344 m | under overhead cover terrain reads 37.6% at 2001–2006 m across a structure — excluded |
| 10 m | ≈27% | 1335–1345 m | under overhead cover terrain reads 29.2% at 2001–2011 m across a structure — excluded |
| 20 m | ≈23.4% | 1325–1345 m | under overhead cover terrain reads 25.0% at 2000–2020 m across a structure — excluded |
| 25 m | ≈22.1% | 1320–1345 m | under overhead cover terrain reads 23.4% at 2001–2026 m across a structure — excluded |
| 50 m | 19.2% | 1296–1346 m | |
| 100 m | 17.0% | 1248–1348 m |
descends at startmay 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: mixed (57% unpaved), according to each state's road inventory: .
Access: Listed 2026-09-08 (max-off-inventory, class A — Peter's ruling): the 25 m maximum at 2006–2031 m lies where the state road inventory covers 0% of the window, on a tail beyond the inventoried road. Held from rankings until the extent is trimmed to the inventoried run and re-measured. Also re-lined 2026-09-15 to the state road inventory where the measured line had left the road: the steepest 25 m now reads 22.15 % (was 23.62 %) and sits 0.0 m from the mapped centreline. Ranked on the re-measured line.
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, PA_WesternPA_2019_D20 (collected 2020) |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:26917; sampled every 1.0 m, bilinear interpolation |
| Tiles | x65y450, x65y451 |
| Road centreline | OpenStreetMap (local PBF extract), snapshot 2026-09-06T20:21:35Z |
| Quality status | evidence quality B; caveated windows: texture excluded |
| Analysis | OCL 0.1.0, analysis 0.1.0, run reline-campaign-260915, calculated 2026-09-15 |
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:26917",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/usa/pa-west/USGS_1M_17_x65y450_PA_WesternPA_2019_D20.tif",
"data/cache/usa/pa-west/USGS_1M_17_x65y451_PA_WesternPA_2019_D20.tif"
],
"calculated_at": "2026-09-15T06:39:04+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/pennsylvania-2026-09-07.osm.pbf",
"osm_snapshot": "2026-09-06T20:21:35Z",
"run_id": "reline-campaign-260915",
"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, PA_WesternPA_2019_D20 (collected 2020)",
"elevation_tile_ids": [
"x65y450",
"x65y451"
],
"climb_origin": "discovered",
"canopy_check": "unavailable \u2014 EPT corridor failed: PA_WesternPA_2019_D20: HTTP Error 404: Not Found",
"structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing"
}