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27.2 miles
Distance
3,980 ft
Climb
-3,976 ft
Descent
2,058 ft
High Point
3 ft
Altitude change
158 ft
Altitude min
158 ft
Altitude start
161 ft
Altitude end
-77%
Grade max
41.4%
Grade min
13 miles
Distance climb
13 miles
Distance down
1 mile
Distance flat
Good ride from the coast to Big Basin and Back. As always, heading down Middle Ridge is easier than going up.
Detailed Description
Chalks_Big-Basin_Loop is a 27 mile moderately popular extreme route located near Boulder Creek California. This mountain bike primary route can be used both directions and has a moderate overall physical rating. This route includes 10 trails. This route climbs 3,980 ft with a max elevation of 2,058 ft then descends -3,976 ft.
Trail Issues on Route
- Minor Issue / Yellow: 1 trail (newest: Mar 31, 2025)
Local Trail Association
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Stats
-
Distance27 miles
-
Avg time2 hr 36 min
-
Altitude min158 ft
-
Altitude start158 ft
-
Altitude end161 ft
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Climb3,980 ft
-
Descent-3,976 ft
-
Grade max-77%
-
Grade min41.4%
-
Distance climb13 miles
-
Distance down13 miles
-
Distance flat1 mile
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Trails in Route
| 6 miles | |||||
| 2 miles | |||||
| 1,260 ft | |||||
| 548 ft | |||||
| 6 miles | |||||
| 2 miles | |||||
| 5 miles | |||||
| 1,260 ft | |||||
| 2 miles | |||||
| 6 miles |
Details
-
Riding area
-
Primary ActivityMountain Bike
-
Other Activities
- Hike
- Trail Running
-
Difficulty ratingDouble Black Diamond
-
Route TypeLoop
-
Bike typeXC
-
DirectionBoth Directions
-
Physical ratingModerate
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3D
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)
Trailforks scans users activity logs 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 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
- less popular
- not popular
ATV/ORV/OHV Filter
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US Cell Coverage
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Activity Recordings
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Activity Recordings
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Winter Trails
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Missing Trails
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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
Trails Deemphasized
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Trail transparency
- Singletrack
- Unpaved
Videos
Recent Trail Reports Along Route
more reports »
- By aguasonic & contributors
- #14590 - 2,019 views
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