19.8 miles
2,328 ft
-6,878 ft
5,101 ft
High Point

This Route takes you from Eaton Saddle down Valley Forge over to the Gabrielino and finally via Sturtevant down to Arcadia.

Detailed Description
Valley Forge/Gabrielino/Sturtevant is a 20 mile expert route located near Altadena California. This mountain bike only route can be used one direction and has a hard overall physical rating. This route includes 3 trails. This route climbs 2,328 ft with a max elevation of 5,101 ft then descends -6,878 ft.
Local Trail Association
Local trail association
Mount Wilson Bicycling Association (mwba.org)
Please consider joining or donating to the local riding association to support trail development & maintenance.
donate to earn trail karma!



  • Riding area
  • Primary Activity
    Mountain Bike
  • Difficulty rating
    Black Diamond
  • Route Type
  • Direction
    One Direction
  • Physical rating
More Stats for Valley Forge/Gabrielino/Sturtevant mountain bike route
  • Altitude change
    -4,551 ft
  • Altitude min
    551 ft
  • Altitude start
    5,101 ft
  • Altitude end
    551 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    6 miles
  • Distance down
    13 miles
  • Distance flat
    1 mile
no votes yet
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Snow Cover Inadequate
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Flow (Ridden Direction)
Trailforks scans users ridelogs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of riders are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
  • bi-directional trail
  • no data
Trail Last Ridden
Trailforks scans ridelogs to determine the last time a trail was ridden.
  • < 2 days
  • < 1 week
  • < 2 weeks
  • < 1 month
  • < 6 months
  • > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction
Contribute Details
Colors indicate trail is missing specified detail.
  • Description
  • Photos
  • Description & Photos
  • Videos
Trail Popularity ?
Trailforks scans ridelogs to determine which trails are ridden the most in the last 9 months. Trails are compared with nearby trails in the same city region with a possible 25 colour shades. Think of this as a heatmap, more rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular
Max Vehicle Width

Radar Time
x Activity Recordings
Trailforks users anonymized public ridelogs from the past 6 months.
  • mountain biking recent
  • mountain biking (>6 month)
  • hiking (1 year)
  • moto (1 year)
Activity Recordings
Trailforks users anonymized public skilogs from the past 12 months.
  • Downhill Ski
  • Backcountry Ski
  • Nordic Ski
Jump Magnitude Heatmap
Heatmap of where riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
Trails Deemphasized
Trails are shown in grey.
Only show trails with NO bikes.

Save the current map location and zoom level as your default home location whenever this page is loaded.

Trail transparency
trail: Sturtevant
42:10 | 19 | comments: 0 | favs:
Apr 16, 2022
youtuber Sturtevant Trail - Mt. Wilson - Altadena, CA
Sturtevant Trail - Mt. Wilson - Altadena, CA
trail: Sturtevant
28:55 | 871 | comments: 0 | favs:
Oct 7, 2018

Recent Trail Reports Along Route

May 15, 2022 @ 8:50pm
May 15, 2022
Dropping in from the observatory does not indicate closed. It should. There is major erosion. Dry loose loam covered in leaves and pine cones litter the trail. In some sections, you can barely identify the trail. Downed trees and branches, overgrown brush is everywhere. But worse than overgrown vegetation is swarms of mosquitoes from observatory all the way down to campsites. The bottom of Sturtevant is definitely closed. The paved climb back to the main road has boulder/rock fall everywhere. This place feels abandoned and nature is reclaiming its facilities. The road entrance has the following sign posted. This sign should be posted at the observatory trail head.
Gabrielino (Newcomb's Pass to Sturtevant)
Feb 2, 2020 @ 8:15pm
Feb 2, 2020
Overgrown vegetation with lots of trees blocking the trail.
Chantry Hell Climb
Oct 8, 2017 @ 6:31pm
Oct 8, 2017
It's a paved road, so... However, the access road down to Arcadia from here has a section where the road closes to one lane near the bottom. Be cautious on that road.
more reports »
  • By truescycles & contributors
  • #3029 - 1,199 views
  • flag
  • login to download gpx or kml files.