LIVING SURVEY — measurements are reviewed continuously as new data and local evidence arrive. Seen a sign, a gate, or a better name? Submit an update no account needed · photos welcome via GitHub

Pack Monadnock (Miller State Park)

2111.5 m · net rise 239.9 m · total ascent 240.9 m · overall 11.4% · evidence quality B (good) · Peterborough · New Hampshire · share

Shape: sustained — 32% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 236 m.

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

≈ Overhead cover (tree canopy or structures) spans 52% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain — the flag does not say whether the true value is higher or lower. Longer windows average over more clean ground and are steadier.

Gradient ladder what do windows mean?

Window	Maximum	Located at
2 m (diagnostic)	≈29%	1935–1937 m	under overhead cover
3 m (diagnostic)	≈29%	1935–1938 m	under overhead cover
5 m	≈27%	1934–1939 m	under overhead cover
10 m	≈24%	1934–1944 m	under overhead cover
20 m	≈23.7%	1934–1954 m	under overhead cover
25 m	≈23.3%	1934–1959 m	under overhead cover
50 m	≈21.1%	1912–1962 m	under overhead cover
100 m	≈19.3%	1911–2011 m	under overhead cover

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 · OSM way 5568982 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.

Surface: paved throughout, according to each state's road inventory.

Access: Toll road: motor vehicles pay; bicycles — charge unknown (OpenStreetMap toll tags, 2026-09-15).

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%

Pack Monadnock (Miller State Park) LiDAR hillshade map with contours

Profile

The 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, NH_Coastal_2019_B19 (collected 2019)
Resolution / CRS	1.0 m grid, EPSG:26919; sampled every 1.0 m, bilinear interpolation
Tiles	x26y475
Road centreline	OpenStreetMap (local PBF extract), snapshot 2026-08-21T20:21:11Z
Quality status	evidence quality B; caveated windows: canopy or structure
Analysis	OCL 0.1.0, analysis 0.1.0, run identifier not recorded (legacy measurement, before the campaign driver stamped runs), calculated 2026-08-22

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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
    "data/cache/usa/nh/USGS_1M_19_x26y475_NH_Coastal_2019_B19.tif"
  ],
  "calculated_at": "2026-08-22T14:29:54+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_ids": [
    5568982
  ],
  "osm_versions": {
    "5568982": 4
  },
  "osm_timestamps": {
    "5568982": "2020-11-11 16:46:11+00:00"
  },
  "osm_retrieved_at": "2026-08-22T14:29:54+00:00",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-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, NH_Coastal_2019_B19 (collected 2019)",
  "elevation_tile_ids": [
    "x26y475"
  ],
  "climb_origin": "named",
  "canopy_source": {
    "kind": "ept_corridor_max_return",
    "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NH_Coastal_2_2019",
    "ept_crs": "EPSG:3857",
    "station_coverage": 0.999,
    "cell_ground_m": 1.0,
    "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
}