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An aptly-named rocky gravel road across a ridge and down to Bon Tempe Dam.


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Map Key

1.8

Miles

3.0

KM

Doubletrack

1,421' 433 m

High

733' 224 m

Low

65' 20 m

Up

752' 229 m

Down

8%

Avg Grade (5°)

24%

Max Grade (13°)

Dogs Leashed

E-Bikes Unknown

Features Views

As of writing, e-bike policy is under review - marinwater.org/e-bikes

Need to Know

There's a porta-potty at the Bon Tempe trailhead parking lot, on the other side of the dam.

Description

Difficult uphill, intermediate downhill. You can reach the top by riding up Rock Spring Rd from Lake Lagunitas (difficult, but less than a mile), or you can ride down Rock Spring Rd from Ridgecrest Blvd (as part of a long Mt. Tam loop) and turn left here. It's more fun than the bottom section of Rock Spring, with much better views. Starts with downhill, levels out with some small ups and downs along the ridge, then ends with a steeper downhill section. Going across the ridge, a couple of short uphill sections may be challenging, more because of loose rock and gravel than steepness.

Contacts

Shared By:

Sir Tam-a-lot

Trail Ratings

  3.0 from 2 votes

#26959

Overall
  3.0 from 2 votes
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Trail Rankings

#2,371

in California

#26,959

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Photos

Rock Spring is fast, don't want to miss the turn onto Rocky Ridge, look for the logs on the left.
Jul 4, 2023 near Kentfield, CA
View from the ridge, March 2022
Jan 29, 2023 near Kentfield, CA
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Weather


Current Trail Conditions

Unknown
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Check-Ins

Apr 25, 2023
V Man
Road up from Bon Tempe Dam ie. bottom of 2 miles or so, at times very steep and loose - not sure their is steeper or more technical climb on Tam 1.8mi — 20h 00m
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