McBride & Robson Valley / Map sheet
West Twin Old Growth
- Loop
- 1.2 km
- Elevation gain
- Approx. 50 m Terrain-model estimate; not a surveyed measurement.
- Walking time
- Unconfirmed
- Difficulty
- Easy
loop
Route map
The highlighted line follows the documented outing.
© OpenStreetMap contributors. Route geometry is available under the Open Database License (ODbL) 1.0. · Line source · Open Database License (ODbL) 1.0 · Source-line database: https://hikingprincegeorge.com/data/osm-route-lines.geojson
Published locations
Numbered points match the map. Use the role beside each point. A summit or park reference point is not a parking location.
| Place and role | Coordinates | Source and notes |
|---|---|---|
| West Twin Old Growth historical published trailhead / parking area (2010) | 53.440187 -120.505363 | West Twin Old Growth trailhead: 53 26.4112 N, 120 30.3218 W (degrees and decimal minutes), PDF page 2.
Historical Highway 16 pullout location; current access not confirmed. The tourism-hosted guide identifies itself as a research copy and says access, trails and amenities have not been updated. Coordinate provenance is verified; current access is not. Source date: 2010 https://mcbridetourism.ca/wp-content/uploads/McBrides-Green-Guide.pdf |
How the elevation gain was established
Outing: loop outing from Published roadside trail access; 1.26 km along the mapped itinerary
Copernicus DEM 2021 GLO-90 via Open-Meteo (90 m resolution). v7-smoothed-ascent-1: interpolate retained terrain samples at 100 m spacing; apply one triangular 1:2:1 smoothing pass over ±100 m; preserve start, finish and documented turnaround heights; sum uphill excursions with a 5 m reversal threshold; round to nearest 10 m.
Approximate terrain-model ascent, not a field or GPS measurement. Coarse cells and smoothing can miss small climbs, switchbacks, structures and sharp terrain. Processing sensitivity is not a statistical confidence interval.
Sources checked 2026-10-19.
Your trip notes
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