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1,726 ft
Distance
34 ft
Climb
-124 ft
Descent
00:02:28
Avg time
-91 ft
Altitude change
972 ft
Altitude min
1,094 ft
Altitude max
1,063 ft
Altitude start
971 ft
Altitude end
-5.3%
Grade
-29.9%
Grade max
23.6%
Grade min
240 ft
Distance climb
1,106 ft
Distance down
377 ft
Distance flat
00:02:28
Avg time
Grass Line Details
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Activities
- Mountain Bike
- E-Bike
- Hike
- Trail Running
-
Riding AreaFrank G. Bonelli Park
San Dimas, California -
Difficulty Rating
-
Local Popularity
-
Hiking SAC ScaleT2 Mountain Hiking
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Trail TypeSingletrack
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Bike TypeAM
-
DirectionDownhill Primary
-
Climb DifficultyGreen
-
Physical RatingEasy
-
Trail VisibilityAlways easy to follow
-
Dogs AllowedYes
-
eBike Allowed
Narrow Single track from top of tree line to via verde path featuring a bumpy straightforward easy descent
Local Trail Association
-
-
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trail development & maintenance.
Recent Activity on Trail
Past Week
- 0 rides
6 Months
- 5 rides
- 9 miles avg distance
All
- 36 rides
- Last: Nov 10, 2026
Grass Line Trail Reports
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Trail Conditions
- Unknown
- Snow Groomed
- Snow Packed
- Snow Covered
- Snow Cover Partial
- Freeze/thaw Cycle
- Icy
- Prevalent Mud
- Wet
- Variable
- Ideal
- Dry
- Very Dry
Trail Flow (Ridden Direction)
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The colour categories are based on what percentage of users are riding a trail in its intended direction.
The colour categories are based on what percentage of users are riding a trail in its intended direction.
- > 96%
- > 90%
- > 80%
- > 70%
- > 50%
- < 50%
- bi-directional trail
- no data
Trail Last Used
Trailforks scans activity logs 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.
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- Photos
- Description & Photos
- Videos
Trail Popularity ?
Trailforks scans activity logs 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 activities = more kinetic energy = warmer colors.
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- popular
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- not popular
ATV/ORV/OHV Filter
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Activity Recordings
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Activity Recordings
Trailforks uses anonymized public activity data.
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Winter Trails
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Missing Trails
Most Popular
Least Popular
Trails are colored based on popularity. The more popular a trail is, the more red. Less popular trails trend towards green.
Jump Magnitude Heatmap
Heatmap of where users jump on trails. Zoom in to see individual jumps, click circles to view jump details.
BC Backroad Status
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Slope Aspect
Direction the slope faces
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Directions to grass-line trailhead
(34.078400, -117.803830)
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Nearby Trails
- Power Lines 95 ft
- Tree Coaster 371 ft
- Stone Henge Line 541 ft
- Peaknic 564 ft
- Tree Line 928 ft
Frank G. Bonelli Park
- By rowdyphil & contributors
- #423921 - 296 views
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