AMBLEWAY Wildest hikes

Mount Tamalpais Watershed

Old Railroad Grade Fire Road & Southern Marin Line Road via Blithedale Ridge Fire Road

4.2 mi · ▲ 950 ft · 1 hr 53 min

Old Railroad Grade Fire Road & Southern Marin Line Road via Blithedale Ridge Fire Road is a 4.2-mile out-and-back in Mount Tamalpais Watershed near Mill Valley, CA. It climbs 950 ft, with sections as steep as 23% grade, and is mostly gravel. It scores 53/100 on the Ambleway Wildness scale: backcountry feel.

Elevation

0 mi440 – 922 ft · steepest grade: 23%4.5 mi

Getting there

Trailhead: Tamelpa Trail 37.91994, -122.56388
Nearest town Mill Valley, CA
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Directions

AMBLEWAYwww.ambleway.com

Old Railroad Grade Fire Road & Southern Marin Line Road via Blithedale Ridge Fire Road

4.2 mi · ▲ 950 ft · 1 hr 53 min

Elevation 440–921 ft

Out & Back · Mount Tamalpais Watershed

Trailhead: Tamelpa Trail · 37.91994, -122.56388

Weather Aug 3: Clear, high 95°F / low 64° · precip 0% · wind 5 mph · sunrise 6:16 AM · sunset 8:18 PM

  1. Start on Tamelpa Trail, heading N.
  2. 50 ftTurn right, heading NE.
  3. 1.3 miTurn left onto Horseshoe Fire Road, heading N.
  4. 0.2 miTurn right onto Blithedale Ridge Fire Road, heading SE.
  5. 0.2 miSharp left onto H Line Fire Road, heading SE.
  6. 0.2 miBear left onto Southern Marin Line Road, heading N.
  7. 50 ftContinue straight onto H Line Fire Road, heading N.
  8. 50 ftTurn right onto Southern Marin Line Road, heading E.
  9. 0.2 miReach Old Railroad Grade Fire Road, then turn around and head back the way you came.
  10. 0.2 miTurn left onto H Line Fire Road, heading NW.
  11. 50 ftContinue straight onto Southern Marin Line Road, heading NW.
  12. 100 ftBear right onto H Line Fire Road, heading NW.
  13. 0.2 miSharp right onto Blithedale Ridge Fire Road, heading W.
  14. 0.2 miTurn left onto Horseshoe Fire Road, heading NW.
  15. 0.2 miTurn right onto Old Railroad Grade Fire Road, heading NW.
  16. 1.3 miTurn left onto Tamelpa Trail, heading E.
  17. 50 ftArrive back at the trailhead.

Each distance is the walk from the previous step. Tap a step for a map of its junction.

Trail map, photos and weather for this hike: www.ambleway.com/hikes/dawn-falls-out-back-7-km-3a3e

Trail surface

66% gravel10% dirt24% unspecified

Weather

ClearTemperature 95°F64°
Feels like82°Precip0%Wind5 mphUV8Humidity30%
Hourly temperature
95°60°
Sunrise 6:16 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:18 PM
Tue 87°69°
Wed 83°54°
Thu 70°52°
Fri 73°50°
Sat 73°50°
Sun 66°50°

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