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Mountain Avenue

489.5 m · net rise 50.1 m · overall 10.2% · evidence quality A (high) · St. Johnsbury · Vermont · share

Shape: sustained — 43% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 281 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)	22%	350–352 m
3 m (diagnostic)	21%	356–359 m
5 m	21%	355–360 m
10 m	21%	349–359 m
20 m	20.7%	340–360 m
25 m	20.6%	334–359 m
50 m	19.8%	325–375 m
100 m	18.1%	294–394 m

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

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%

Mountain Avenue 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, VT_Statewide_A23 (collected 2023)
Resolution / CRS	1.0 m grid, EPSG:26918; sampled every 1.0 m, bilinear interpolation
Tiles	x73y493
Road centreline	OpenStreetMap (local PBF extract), snapshot 2026-08-21T20:21:11Z
Quality status	evidence quality A; no review flags; no caveated windows
Analysis	OCL 0.1.0, analysis 0.1.0, run vt-260831, calculated 2026-09-01

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/vt/USGS_1M_18_x73y493_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-01T03:14:26+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/vermont-260821.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "vt-260831",
  "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, VT_Statewide_A23 (collected 2023)",
  "elevation_tile_ids": [
    "x73y493"
  ],
  "trimmed_from": "mountain-avenue",
  "trim_cut_m": [
    [
      884.2,
      915.8
    ]
  ],
  "canopy_source": {
    "kind": "ept_corridor_max_return",
    "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_2_A23",
    "ept_crs": "EPSG:3857",
    "station_coverage": 1.0,
    "cell_ground_m": 1.0,
    "nodes_failed": 0
  },
  "inventory_drain": "inventory-inconclusive",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
}