Oursan, Old San Pablo, and Inspiration Trail Loop

Yes, an EBMUD (East Bay Municipal Utility District) permit is required to access these trails. You will need to sign in at a kiosk.

The trail can be accessed from various points. A common starting point is near the Inspiration Trailhead at Old San Pablo Trail or the Nimitz Way Trailhead, which is a junction of Curran and Inspiration Trails. Specific parking details may vary, so check local signage.

The terrain is quite varied. It starts with the rocky Orinda Connector Trail, moves through shaded woodlands on the Oursan Trail, and then transitions to mostly flat sections on the Old San Pablo Trail, which includes both unpaved roads and some paved parts. The Inspiration Trail involves a moderately steep climb up to San Pablo Ridge, following a fire road and winding along a rolling ridgeline.

You'll enjoy diverse scenery, including dense oak, bay, and conifer woodlands, open meadows, and continuous views of the San Pablo Reservoir. The Inspiration Trail offers spectacular ridgeline views and phenomenal panoramas, especially from Inspiration Point Overlook and Inspiration Point, Tilden Regional Park, providing a view of San Pablo Reservoir.

Information regarding dog access on EBMUD lands can vary. It's best to check the latest regulations directly with the East Bay Municipal Utility District before bringing your dog, as permits and specific rules often apply.

The trail can be enjoyed year-round, but spring and fall often offer the most pleasant temperatures and vibrant scenery. During these seasons, the woodlands are lush, and the views are clear. Summer can be hot, and winter might bring muddy conditions, especially after rain.

Yes, about half a mile into the Old San Pablo Trail, you'll find the EBMUD Watershed Headquarters, which is a convenient stop providing restrooms and water.

The area is rich in wildlife. Near the reservoir, you might spot various birds like ducks, geese, herons, and egrets. The diverse habitats also support other wildlife, with some hikers reporting sightings of otters.

Yes, the route also passes through sections of the ADT - California - T - Seg 8, Mokelumne Coast to Crest Trail, East Bay Skyline National Recreation Trail, and the Bay Area Ridge Trail - 02 - East Bay.

While sections like the Old San Pablo Trail are generally easy with limited elevation change, the overall loop is rated as difficult due to its length and the moderately steep climb on the Inspiration Trail. Beginners might find the full loop challenging, but could consider shorter sections like the Old San Pablo Trail for an easier experience.

The most challenging part is the moderately steep climb on the Inspiration Trail, which ascends to 1040 feet of elevation to reach Inspiration Point. This section is also highly rewarding, offering 360-degree panoramic views of the reservoir, surrounding hills, and distant landscapes.