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Marie Dhority Bridge loop from Mount Tamalpais Watershed

Marie Dhority Bridge loop from Mount Tamalpais Watershed

Hard

4.6

(1691)

9,940

riders

Marie Dhority Bridge loop from Mount Tamalpais Watershed

06:24

69.3km

1,680m

Gravel riding

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 13, 2026

Tips

Includes a segment in which cycling is not permitted

After 19.0 km for 55 m

Waypoints

Start point

Parking

Get Directions

13.8 km

West Blithedale Avenue Trailhead

Highlight • Trail

The wood bridge across the creek marks the beginning of the Old Railroad Grade, today a wide fireroad

Tip by

18.8 km

Old Railroad Grade Trail Gate Overlook

Highlight • Viewpoint

Sweeping views south and east, all the way to SF, and Mt Tam right above behind you to the north. The bench is dedicated to the family who built their house in front of you 60 years ago.

Tip by

18.9 km

Railroad Grade at Fern Canyon & Summit

Highlight • Trail

Uphill from this intersection a portion of the Railroad Grade has been taken over by Fern Canyon Rd after the Mt Tam railroad closed. A short distance uphill on pavement …

Tip by

22.9 km

Railroad Grade Fire Road Overlook to San Francisco

Highlight • Viewpoint

On clear days views open up along the trail across the bay and including the San Francisco skyline

Tip by

23.6 km

Flowy downhill section above Laguna Creek

Highlight • Trail

After looping around West Point the Railroad Grade trail snakes through open and tree-lined sections with fun curves.

Tip by

23.9 km

Mount Tamalpais West Point

Peak

24.0 km

Old Railroad Grade Trail (upper half) — Mt Tam

Highlight (Segment) • Trail

Old Railroad Grade trail follows the route of the railroad that reached the peak of Mount Tam from Mill Valley (and a spur to Muir Beach) between 1896 and 1930. …

Tip by

52.3 km

Redwood Grove Group Picnic Area

Highlight • Rest Area

This large group picnic area is a lovely spot under a shady grove of towering redwoods that sits along Lagunitas Creek. There is piped drinking water and restrooms nearby, and …

Tip by

55.5 km

Marie Dhority Bridge

Highlight • Bridge

Popular rock beach spot to cool off in the creek right next to the long wooden pedestrian trail bridge

Tip by

62.7 km

Gary Giacomini Open Space Preserve

Nature Reserve

69.3 km

End point

Parking

Way Types & Surfaces

Way Types

48.3 km

15.3 km

5.71 km

< 100 m

Surfaces

48.2 km

10.8 km

10.1 km

224 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (740 m)

Lowest point (30 m)

Weather

Today

Friday 4 September

21°C

12°C

0 %

Additional weather tips

Max wind speed: 16.0 km/h

to get more detailed weather forecasts along your route

Comments

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Marie Dhority Bridge loop from Mount Tamalpais Watershed

West Blithedale Avenue Trailhead

Old Railroad Grade Trail Gate Overlook

Railroad Grade at Fern Canyon & Summit

Railroad Grade Fire Road Overlook to San Francisco

Flowy downhill section above Laguna Creek

Old Railroad Grade Trail (upper half) — Mt Tam

Redwood Grove Group Picnic Area

Marie Dhority Bridge

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