Seaborg, Briones Crest, Table Top, and Abrigo Valley Trail Loop

The loop typically starts from the Bear Creek Trailhead, which also offers parking facilities. This trailhead provides convenient access to the various trails that make up the loop.

The loop features diverse terrain, primarily consisting of natural paths, unpaved sections, and gravel fire roads, which are common in Briones Regional Park. You'll encounter some asphalt sections as well. The Abrigo Valley Trail is often shaded and well-maintained, with a steady incline. The Briones Crest Trail is mainly a gravel fire road along ridge tops, while the Seaborg Trail includes a steep climb at its beginning.

This loop is generally classified as a moderate mountain bike ride, requiring good fitness. While some sections are manageable, there are challenging climbs, particularly on fire roads, with some short segments reaching a 15% grade. Riders may need to push their bikes on some portions due to the steepness.

You'll enjoy picturesque scenery throughout, including cute valleys, rolling hills, and a mix of grassland and wooded patches. A major highlight is the Table Top overlook, which offers expansive views to the North and West. From higher elevations, you can see across Suisun Bay toward the Delta, into the San Ramon Valley, and to Mount Diablo. You'll also pass near Briones Peak.

The area is particularly scenic when the grass is green, which is roughly between January and April. During this time, the landscape resembles a giant lawn, and wildflowers can add beauty along trails like the Abrigo Valley Trail. Spring and fall generally offer the most pleasant temperatures for riding.

Yes, Briones Regional Park, where this loop is located, is generally dog-friendly. However, specific leash rules and regulations may apply, so it's always best to check the park's official guidelines before your visit.

Briones Regional Park typically has a daily parking fee at designated trailheads. While permits are not generally required for day-use access to the trails themselves, it's advisable to check the East Bay Regional Park District's official website for the most current information on fees and any specific regulations.

Yes, the route incorporates sections of several other trails. You will ride along parts of the Ivan Dickson Trail, the ADT - California - T - Seg 8, and the Mokelumne Coast to Crest Trail, in addition to the named trails of this loop.

Yes, be prepared for steep sections. The Seaborg Trail has a steep climb at its beginning, reaching up to a 15% maximum slope in less than a quarter-mile. A segment of the Briones Crest Trail also dips considerably and then climbs back out, averaging a 15% grade over 0.3 miles, which can be the toughest climb of the ride.

While the park itself is largely undeveloped, its proximity to several cities means you can find cafes, pubs, and other amenities in nearby towns like Orinda, Lafayette, or Martinez shortly after exiting the park.