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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.
  • > 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
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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
  • Snowmobile
Jump Magnitude Heatmap
Heatmap of where riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
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      No description for Big Rock / Lucas Valley has been added yet! Login or register to submit one.
      Activities Click to view
      Region Details
      • 11
      • 8
      • 11
      • 5
      • 1

      Region Status
      Caution as of Jul 21, 2021
      Local Trail Association

      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

      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
      25 |
      Feb 14, 2022 @ 2:15am
      Feb 14, 2022
      20 |
      Feb 14, 2022 @ 2:14am
      Feb 14, 2022
      19 |
      Feb 14, 2022 @ 2:14am
      Feb 14, 2022
      19 |
      Feb 14, 2022 @ 2:14am
      Feb 14, 2022
      56 |
      Jul 21, 2021 @ 8:54pm
      Jul 21, 2021

      Videos of Big Rock / Lucas Valley Mountain Bike

      Big Rock
      0:09 | 207 | Sep 27, 2017
      BRAKE FADE!!!!!!!!!!!!
      trail: Rotor Burn
      2:17 | 133 | Jul 14, 2016
      680 to Solstice
      trail: 680
      8:41 | 795 | Jan 21, 2013
      Big Rock Trail / Marin County Flow &...
      7:15 | 88 | Feb 8, 2022 , My City
      Luiz Fire Road dirt/gravel road trail located...
      8:42 | 96 | Aug 27, 2021 , My City
      680 Trail - Top Down
      trail: 680
      20:33 | 619 | Jan 1, 2019 , My City
      Goat Trail
      trail: Goat Trail
      6:48 | 1358 | Oct 19, 2018 , My City
      E committer will not work for this trail.
      18:00 | 89 | Aug 28, 2021 , My City

      Recent Trail Reports

      statustraildateconditioninfouser
      Luiz Ranch Fire road
      Jan 16, 2023 @ 9:43pm
      Jan 16, 2023
      Wettamarancho-report
      Butterfield Fire Road
      Jan 16, 2023 @ 9:43pm
      Jan 16, 2023
      Wettamarancho-report
      680
      Nov 23, 2022 @ 7:52pm
      Nov 23, 2022
      DryThe Berms on the top are brand new, some...MtbMarin7
      Big Rock Trail
      Nov 10, 2022 @ 4:11pm
      Nov 10, 2022
      VariableNot too wet from the last storm. Few...getinsideways415
      Queenstone Trail
      Oct 2, 2022 @ 7:42pm
      Oct 2, 2022
      DryThis is NOT a blue trail! Much easier to...richbrazil
      Goat Trail
      Aug 27, 2022 @ 6:11pm
      Aug 27, 2022
      Very DryTree in the middle of the trail near the...Tigrtheshredder
      Luiz Fire Road
      Aug 8, 2022 @ 4:26pm
      Aug 8, 2022
      Very DryE-Bike Doctormast
      Loma Alta Fire Rd.
      Jun 29, 2022 @ 9:09am
      Jun 29, 2022
      Drytamarancho-report
      Queenstone Fire Road
      Apr 12, 2022 @ 3:24pm
      Apr 12, 2022
      IdealE-Bike geoffmack
      Terra Linda to Lucas Valley Fire Road
      Mar 12, 2022 @ 11:19am
      Mar 12, 2022
      Very DryBro-tato

      Activity Feed

      usernameactiontypetitledate
      user #2917316TigrtheshreddercommenttrailTerra Linda to Lucas Valley Fire Road
      Jan 23, 2023 @ 6:38pm
      Jan 23, 2023
      user #3032534Quietman121addphoto in My City
      Jan 23, 2023 @ 1:07pm
      Jan 23, 2023
      user #2927275tamarancho-reportaddreportLuiz Ranch Fire road and 1 more
      Jan 17, 2023 @ 6:27pm
      Jan 17, 2023
      user #2350130ChriskbrkrcommenttrailBurnt Ridge Fire Road
      Jan 15, 2023 @ 8:36pm
      Jan 15, 2023
      user #2299796KaluariddentrailIrving Fire Road Spur and 3 more
      Jan 8, 2023 @ 8:52am
      Jan 8, 2023

      Recent Comments

      usernametypetitlecommentdate
      user #2917316TigrtheshreddertrailTerra Linda to Lucas Valley Fire RoadAverage fire road
      Jan 23, 2023 @ 6:38pm
      Jan 23, 2023
      user #2350130ChriskbrkrtrailBurnt Ridge Fire RoadIt would be great to have this open to access...
      Jan 15, 2023 @ 8:36pm
      Jan 15, 2023
      user #2917316TigrtheshreddertrailBig Rock TrailThe best way to get to the top of big rock ridge
      Dec 28, 2022 @ 6:16pm
      Dec 28, 2022
      user #2917316TigrtheshreddertrailGoat TrailVery steep slippery and fun! Would not...
      Nov 24, 2022 @ 9:42am
      Nov 24, 2022
      user #2917316TigrtheshreddertrailRedwood Canyon Fire ROadI’m pretty sure this is on private property
      Nov 24, 2022 @ 9:40am
      Nov 24, 2022

      Activity Type Stats

      activitytypetrailsdistancedescentdescent distancetotal verticalratingglobal rankstate rankphotosreportsroutesridelogs
      Mountain Bike3642 miles18,323 ft26 miles1,759 ft
      #4,759#2,1291391816,435
      Horse15
      31
      Hike4242 miles18,323 ft26 miles1,759 ft
      #3,978#1,971181275
      Trail Running4242 miles18,323 ft26 miles1,759 ft
      #3,987#1,97618163
      • 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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