Routes

Planner

Features

Updates

App

Get the App

Routes

Mountain biking trails

Old Borges Ranch – Twin Ponds loop from Sycamore Valley Road & Greenbrook Drive

Routes

Mountain biking trails

Old Borges Ranch – Twin Ponds loop from Sycamore Valley Road & Greenbrook Drive

Moderate

3.0

(24)

riders

Old Borges Ranch – Twin Ponds loop from Sycamore Valley Road & Greenbrook Drive

02:58

33.9km

680m

Mountain biking

Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary. The starting point of the route is accessible with public transport.

Last updated: March 28, 2026

Tips

Includes a segment in which cycling is not permitted

After 29.5 km for 96 m

Waypoints

Start point

Bus stop

Get Directions

7.32 km

Black Hills Reservoir

Highlight (Segment) • Lake

Ascending through a challenging uphill climb, this trail takes you through a lush scenic open space, passing by the Black Hills Reservoir. It serves as a great stopping point for enjoying the scenic water views along your ride.

Tip by

17.3 km

Pine Pond

Lake

19.0 km

Sandstone caves in Castle Rock formations

Highlight • Cave

Water, wind, and calcite erosion in per-volcanic sandstone formation.
Slightly acidic rainwater seeps into the sandstone during winter rains and dissolves some of the calcite. Warm and dry days cause …

Tip by

19.1 km

Mammoth Rock

Highlight • Natural Monument

Pine Valley opens up for great views of the tall carst rock outcrops.

Tip by

19.8 km

Sandstone Formations With Holes, Diablo Foothills Regional Park

Highlight • Natural Monument

The rocks in that area are made of sandstone. During our winter rains, acidic rain water seeps into and sits in the rocks. The next summer, the dry heat pulls …

Tip by

21.5 km

Old Borges Ranch

Highlight • Historical Site

Still operating, mostly as an open air farming museum.

Tip by

22.2 km

Twin Ponds

Highlight • Lake

Two small ponds, mostly dry by summer, at the junction with Borges Ranch Trail. They fill again with the winter rains and last through spring and early summer. They are dry in late summer and fall.

Tip by

22.6 km