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Routes
Mountain biking trails
United States
California
Marin County
Kentfield

Alpine Lake - Bon Tempe Dam – Bon Tempe Dam 🚵 loop from Ross

Routes
Mountain biking trails
United States
California
Marin County
Kentfield

Alpine Lake - Bon Tempe Dam – Bon Tempe Dam 🚵 loop from Ross

Intermediate

8

riders

Alpine Lake - Bon Tempe Dam – Bon Tempe Dam 🚵 loop from Ross

03:04

32.1km

860m

Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: October 13, 2025

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1

12.4 km

Alpine Lake - Bon Tempe Dam

Highlight • Lake

Deep blue drinking water reservoir in Mt Tamalpais watershed.
Unfortunately no boating/swimming allowed.

Tip by

2

12.7 km

Bon Tempe Dam 🚵

Highlight (Segment) • Structure

Great hiking and mountain bike destination in Mt Tamalpais watershed. The dam holds the waters of Bon Tempe Lake above the Alpine Lake just below.
For a sweet 2 hour …

Tip by

3

13.2 km

Rocky Ridge Road 🚵

Highlight (Segment) • Trail

Great hiking and mountain biking on this gravel fire road in Mt Tamalpais watershed. It climbs first gradually and increasingly steep from the west side of the Bon Tempe Dam …

Tip by

4

23.4 km

Eldridge Grade Trailhead

Highlight • Trail

Eldrige is a fun, albeit somewhat steep and rocky, gravel doubletrack dropping from the paved road before the summit down the eastern flank of My Tam

Tip by

5

23.4 km

Eldridge Grade Fire Rd Trail (upper half) 🚵 Mt Tam

Highlight (Segment) • Trail

Eldridge Grade descends from the north-side of East Ridge Boulevard (on your right if you're coming down from Mt Tam's East Summit), about where Old Railroad Trail comes in from …

Tip by

B

32.1 km

End point

Bus stop

Way Types & Surfaces

Way Types

16.1 km

8.04 km

5.59 km

2.41 km

Surfaces

16.1 km

9.41 km

5.39 km

985 m

259 m

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Elevation

Elevation

Highest point (740 m)

Lowest point (0 m)

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Road Bike

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Intermediate
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Expert
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