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251.0 m · net rise 37.8 m · total ascent 43.7 m · overall 15.0% · evidence quality U (needs confirmation) · Seattle · Washington

Shape: sustained — 38% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 144 m.

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

needs review unresolved windows — treat short-window maxima here as provisional.

Gradient ladder what do windows mean?

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.

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

Access: Listed 2026-09-29 (inventory hunt wave 1), corrected 2026-09-29: road audit (rekeyed from 'yesler-way', the same named pass under its pre-collision slug) — barrier gate (no access tag) 19.7 m off route. Never silently ranked or dropped (Peter, 2026-08-27).

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

Load the interactive map

Route colour = gradient over a 25 m window: <10% 10–20% 20–25% ≥25%

Route line = the road surface as the LiDAR survey finds it. Basemap roads are for orientation and may sit a few metres off.

Topo (contours) Vector Aerial   © 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

Provenance

{
  "analysis_version": "0.1.0",
  "run_manifest": {
    "manifest_version": "1",
    "code_git_sha": "3330e8966936b5e52e3e396ef32eb2e2bc44124e",
    "code_git_dirty": "false",
    "analysis_version": "0.1.0",
    "analysis_config_digest": "sha256:8c94015b54267da4",
    "python": "3.14.4",
    "numpy": "2.5.3",
    "rasterio": "1.5.1",
    "pyproj": "3.8.0",
    "laspy": "2.7.0",
    "shapely": "2.1.2",
    "pyosmium": "4.3.1",
    "libosmium": "2.23.1",
    "gdal": "3.12.4",
    "proj": "9.8.1",
    "run_id": "us-west-seattle",
    "road_pbf": "us-west-seattle-block-batch-us-west-seattle.osm.pbf",
    "region_key": "usa-wa",
    "crs": "EPSG:26910",
    "elevation_provider_key": "usa3dep",
    "authority": "usa-inventory",
    "registry_pbf": "washington-2026-09-29.osm.pbf",
    "tile_index_snapshot": "sha256:f7baef41a101c628"
  },
  "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:26910",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
    "data/cache/usa/wa/USGS_1M_10_x55y528_WA_KingCounty_2021_B21.tif"
  ],
  "calculated_at": "2026-09-29T19:41:50+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/us-west-seattle-block-batch-us-west-seattle.osm.pbf",
  "osm_snapshot": "",
  "run_id": "us-west-seattle",
  "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, WA_KingCounty_2021_B21 (collected 2021)",
  "elevation_tile_ids": [
    "x55y528"
  ],
  "climb_origin": "named-pass",
  "named_pass": "Yesler Way",
  "any_length": true,
  "seam_filled_samples": {
    "count": 0,
    "distances_m": []
  },
  "seam_filled_in_maximum": false,
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "structure_own_ways": 5,
  "structure_own_ways_source": "map-matched to the road network: the entry carried no way list, so the ways the route runs along were found by geometry (ukclimb.batch.own_ways_by_geometry)",
  "structure_mask_ranges_m": [
    [
      0.0,
      30.3
    ],
    [
      30.3,
      149.0
    ],
    [
      0.0,
      15.0
    ],
    [
      236.0,
      266.0
    ]
  ],
  "carriageway": {
    "stations": 15,
    "stations_resolved": 15,
    "width_median_m": 12.0,
    "width_p10_m": 10.05,
    "width_min_m": 9.0,
    "width_max_m": 12.0,
    "bounded_share": 0.0,
    "unbounded_share": 1.0,
    "confidence_median": 0.0,
    "window_m": [
      200.0,
      225.0
    ],
    "width_at_max25_m": 12.0,
    "window_stations": 6,
    "single_track": false,
    "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
    "status": "ok",
    "source": "dtm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.12,
    "break_min_m": 0.3,
    "stations_failed": 0,
    "hedge_to_hedge": {
      "status": "unavailable \u2014 no DSM raster (surface model absent or point-cloud only, which cannot serve off-line samples)"
    }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
}