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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.
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
ATV/ORV/OHV Filter
Max Vehicle Width
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Radar Time
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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
- Snowmobile
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.
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Activities Click to view
- Mountain Bike
36 trails
- Hike
42 trails
- Trail Running
42 trails
Region Details
- 11
- 8
- 11
- 5
- 1
Region Status
Caution as of Jul 21, 2021
Stats
- Avg Trail Rating
- Trails (view details)
- 36
- Trails Mountain Bike
- 36
- Trails Horse
- 15
- Trails Hike
- 42
- Trails Trail Running
- 42
- Total Distance
- 42 miles
- Total Descent
- 18,322 ft
- Total Vertical
- 1,759 ft
- Highest Trailhead
- 1,870 ft
- Reports
- 181
- Photos
- 139
- Ridden Counter
- 3,131
Popular Big Rock / Lucas Valley Mountain Biking Trails
Photos of Big Rock / Lucas Valley Mountain Bike
trail: 680
6 |
Jan 23, 2023 @ 1:07pm
Jan 23, 2023
trail: 680
4 |
Dec 27, 2022 @ 5:09pm
Dec 27, 2022
trail: 680
6 |
Dec 27, 2022 @ 5:09pm
Dec 27, 2022
trail: Loma Alta Fire Rd.
25 |
Feb 14, 2022 @ 2:15am
Feb 14, 2022
trail: Loma Alta Fire Rd.
20 |
Feb 14, 2022 @ 2:14am
Feb 14, 2022
trail: Loma Alta Fire Rd.
19 |
Feb 14, 2022 @ 2:14am
Feb 14, 2022
trail: Loma Alta Fire Rd.
19 |
Feb 14, 2022 @ 2:14am
Feb 14, 2022
trail: Big Rock Trail
56 |
Jul 21, 2021 @ 8:54pm
Jul 21, 2021Videos of Big Rock / Lucas Valley Mountain Bike
trail: Big Rock Ridge Fire Road
0:09 |
207 |
Sep 27, 2017
trail: Rotor Burn
2:17 |
133 |
Jul 14, 2016
trail: 680
8:41 |
795 |
Jan 21, 2013
trail: Big Rock Trail
7:15 |
88 |
Feb 8, 2022 , My City
trail: Luiz Fire Road
8:42 |
96 |
Aug 27, 2021 , My City
trail: 680
20:33 |
619 |
Jan 1, 2019 , My City
trail: Goat Trail
6:48 |
1358 |
Oct 19, 2018 , My City
trail: Idylberry Trail
18:00 |
89 |
Aug 28, 2021 , My City
Recent Trail Reports
| status | trail | date | condition | info | user |
|---|---|---|---|---|---|
| Luiz Ranch Fire road | Jan 16, 2023 @ 9:43pm Jan 16, 2023 | Wet | tamarancho-report | ||
| Butterfield Fire Road | Jan 16, 2023 @ 9:43pm Jan 16, 2023 | Wet | tamarancho-report | ||
| 680 | Nov 23, 2022 @ 7:52pm Nov 23, 2022 | Dry | MtbMarin7 | ||
| Big Rock Trail | Nov 10, 2022 @ 4:11pm Nov 10, 2022 | Variable | getinsideways415 | ||
| Queenstone Trail | Oct 2, 2022 @ 7:42pm Oct 2, 2022 | Dry | richbrazil | ||
| Goat Trail | Aug 27, 2022 @ 6:11pm Aug 27, 2022 | Very Dry | Tigrtheshredder | ||
| Luiz Fire Road | Aug 8, 2022 @ 4:26pm Aug 8, 2022 | Very Dry | Doctormast | ||
| Loma Alta Fire Rd. | Jun 29, 2022 @ 9:09am Jun 29, 2022 | Dry | tamarancho-report | ||
| Queenstone Fire Road | Apr 12, 2022 @ 3:24pm Apr 12, 2022 | Ideal | geoffmack | ||
| Terra Linda to Lucas Valley Fire Road | Mar 12, 2022 @ 11:19am Mar 12, 2022 | Very Dry | Bro-tato |
Activity Feed
| username | action | type | title | date | |
|---|---|---|---|---|---|
 | Tigrtheshredder | comment | trail | Terra Linda to Lucas Valley Fire Road | Jan 23, 2023 @ 6:38pm Jan 23, 2023 |
 | Quietman121 | add | photo | in My City | Jan 23, 2023 @ 1:07pm Jan 23, 2023 |
 | tamarancho-report | add | report | Luiz Ranch Fire road and 1 more | Jan 17, 2023 @ 6:27pm Jan 17, 2023 |
| Chriskbrkr | comment | trail | Burnt Ridge Fire Road | Jan 15, 2023 @ 8:36pm Jan 15, 2023 |
| Kalua | ridden | trail | Irving Fire Road Spur and 3 more | Jan 8, 2023 @ 8:52am Jan 8, 2023 |
Recent Comments
| username | type | title | comment | date | |
|---|---|---|---|---|---|
| trail | Average fire road | Jan 23, 2023 @ 6:38pm Jan 23, 2023 | ||
| trail | It would be great to have this open to access... | Jan 15, 2023 @ 8:36pm Jan 15, 2023 | ||
| trail | The best way to get to the top of big rock ridge | Dec 28, 2022 @ 6:16pm Dec 28, 2022 | ||
| trail | Very steep slippery and fun! Would not... | Nov 24, 2022 @ 9:42am Nov 24, 2022 | ||
| trail | I’m pretty sure this is on private property | Nov 24, 2022 @ 9:40am Nov 24, 2022 |
Nearby Areas
| name | distance | ||||
|---|---|---|---|---|---|
| Terra Linda-Sleepy Hollow Divide Northern Preserve | 1.5 km | ||||
| The Graveyard | 4 | 1.9 km | |||
| Big Rock / Novato | 1 | 2.5 km | |||
| Tamarancho / West Marin / North Tam | 12 | 26 | 23 | 3.1 km | |
| Hamilton Field | 2 | 4 km |
Local Products
Activity Type Stats
| activitytype | trails | distance | descent | descent distance | total vertical | rating | global rank | state rank | photos | reports | routes | ridelogs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mountain Bike | 36 | 42 miles | 18,323 ft | 26 miles | 1,759 ft | #4,759 | #2,129 | 139 | 181 | 6,435 | ||
| Horse | 15 | 31 | ||||||||||
| Hike | 42 | 42 miles | 18,323 ft | 26 miles | 1,759 ft | #3,978 | #1,971 | 181 | 275 | |||
| Trail Running | 42 | 42 miles | 18,323 ft | 26 miles | 1,759 ft | #3,987 | #1,976 | 181 | 63 |
- By brenthillier
NSMBA TRAILFORKS & contributors - Admins: A4B, MCBC, spokesmanmtb
- #3979 - 8,515 views
- big rock / lucas valley activity log | embed map of Big Rock / Lucas Valley mountain bike trails | big rock / lucas valley mountain biking points of interest
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