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Cal Park Tunnel & Pathway – Alpine Dam loop from Marin Civic Center

Cal Park Tunnel & Pathway – Alpine Dam loop from Marin Civic Center

Hard

2.7

(26)

riders

Cal Park Tunnel & Pathway – Alpine Dam loop from Marin Civic Center

05:19

76.5km

1,390m

Gravel riding

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: June 8, 2026

Tips

Includes a segment in which cycling is not permitted

After 22.5 km for 55 m

Waypoints

Start point

Train Station

Get Directions

6.73 km

Cal Park Tunnel & Pathway

Highlight (Segment) • Cycleway

Opening this bike tunnel through the renovated trail tunnel as part of the 2010 redeveloped rail connection from Larkspur Ferry to Santa Rosa closed a crucial gap in the bike commute to San Francisco.

Tip by

22.3 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

22.4 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 brings you to the end of Fern Cyn. A bit before the end the Railroad Grade gravel forest road splits off again to the right. The Temalpa Trail that joins here is steep with stairs, not open to biking.

Tip by

26.4 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

27.4 km

Mount Tamalpais West Point

Peak

27.5 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. This segment starts about mid-mountain at the site of an old station (notice the concrete "sidewalk" on the side of the trail), at the intersection with Gravity Car Trail and Hoo-Koo-Ee-Koo trail, just above the Double Bowknot (a series of four hairpin curves of the old railroad). Since this used to be a railroad, it has a very steady average grade of around 6%, making it easy to climb up on a bike. About 2 miles from the old station platform the trail passes West Point Inn ( komoot.de/highlight/215020 ) , with snacks, picnic tables and restrooms (also offering romantic cabins with killer views across the whole bay). For more of the history see en.wikipedia.org/wiki/Mount_Tamalpais_and_Muir_Woods_Railway

Tip by

44.1 km

Alpine Dam

Highlight (Segment) • Structure

Constructed in 1917 this dam forms Alpine Lake, which sites between Kent and Bon Tempe Lakes. The road across the top of the dam make it a great place to ride on a loop around the lake.

Tip by

44.8 km

Alpine Lake

Highlight • Lake

This lake was formed by the building of Alpine Dam in 1917. It sits between Kent Lake and Bon Tempe Lake, and is popular for a variety of outdoor activities.

Tip by

47.7 km

Mount Tamalpais Watershed

Nature Reserve

63.6 km

Fish Gulch trail junction

Highlight • Trail

From easiest to hardest climbs out of phoenix lake from this junction:
-Shaver Grade, easy grade, longer, shaded and pretty
-Eldridge Grade, medium, good length and can connect you to mt tam east peak
-Fish Grade fire road, very steep, we hiked the bikes

Tip by

76.5 km

End point

Train Station

Way Types & Surfaces

Way Types

28.2 km

22.0 km

19.2 km

7.07 km

< 100 m

Surfaces

42.9 km

19.7 km

13.5 km

476 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 (undefined)

Weather

Today

Sunday 12 July

31°C

13°C

9 %

Additional weather tips

Max wind speed: 14.0 km/h

to get more detailed weather forecasts along your route

Comments

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Cal Park Tunnel & Pathway – Alpine Dam loop from Marin Civic Center

Cal Park Tunnel & Pathway

Old Railroad Grade Trail Gate Overlook

Railroad Grade at Fern Canyon & Summit

Railroad Grade Fire Road Overlook to San Francisco

Old Railroad Grade Trail (upper half) — Mt Tam

Alpine Dam

Alpine Lake

Fish Gulch trail junction

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