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Mount Greylock (south side)

6394.3 m · net rise 334.4 m · total ascent 339.9 m · overall 5.2% · confidence: high · Massachusetts · share

Shape: sustained — 34% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 95 m.

Not yet matched against documented climbs — the measurement stands on its own.

Gradient ladder what do windows mean?

Window	Maximum	Located at
2 m (diagnostic)	14%	2847–2849 m
3 m (diagnostic)	14%	6380–6383 m
5 m	14%	6379–6384 m
10 m	14%	6375–6385 m
20 m	13.0%	2259–2279 m
25 m	12.9%	2255–2280 m
50 m	12.4%	2243–2293 m
100 m	11.4%	2206–2306 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 · OSM way 9070236 highlights the mapped road · 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.

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

Mount Greylock (south side) LiDAR hillshade map with contours

Profile

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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
    "data/cache/usa/ma/USGS_1M_18_x64y472_MA_Western_B24.tif",
    "data/cache/usa/ma/USGS_1M_18_x64y473_MA_Western_B24.tif",
    "data/cache/usa/ma/USGS_1M_18_x65y473_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-22T14:30:37+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_ids": [
    9070236,
    514597992,
    514597996,
    9547957,
    8873623,
    225543572,
    8873458
  ],
  "osm_versions": {
    "9070236": 13,
    "514597992": 6,
    "514597996": 7,
    "9547957": 12,
    "8873623": 11,
    "225543572": 10,
    "8873458": 7
  },
  "osm_timestamps": {
    "9070236": "2023-08-08 16:05:52+00:00",
    "514597992": "2023-08-07 22:10:56+00:00",
    "514597996": "2023-08-07 22:10:56+00:00",
    "9547957": "2023-08-07 22:10:56+00:00",
    "8873623": "2023-08-07 22:10:56+00:00",
    "225543572": "2025-02-11 02:35:22+00:00",
    "8873458": "2023-08-11 20:58:20+00:00"
  },
  "osm_retrieved_at": "2026-08-22T14:30:37+00:00",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
    "x64y472",
    "x64y473",
    "x65y473"
  ],
  "climb_origin": "named",
  "notes": "Rockwell Road from Lanesborough + Summit Road. Asphalt (OSM).",
  "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.html"
}