Climbing Near Crockett, California

The Carquinez Strait is a narrow waterway which empties the Sacramento and San Joaquin rivers into the San Francisco Bay. It's flanked by grass covered rolling hills that have the occasional sand stone boulder. The area is made up of a mixture of public land (East Bay Regional Park) and private land. The area can be accessed by Interstate 80, Interstate 680, and the John Muir Parkway.

The Loner Boner Boulder is located near Port Costa, California on the Carquinez Strait in the Carquinez Strait Regional Shoreline Park. It is seldom visited and has seen very little attention from the climbing community.Rock quality (sandstone) varies from excellent on one side of the boulder to chossy on the other. There exist multiple solid opportunities for route development.The boulder is on East Bay Regional Park land and access should not be an issue.The name is derived from the fact the boulder is the only rock of any size in sight (i.e. “a Loner”), and the fact that the boulder’s shape is similar to a phallus, put crudely, “a Boner.” Hence, the name, “The Loner Boner Boulder.” On Interstate 80 get off at the Crockett exit (Exit 27) and head east on Pomona Street. Continue on Pomona Street out of Crockett, where it turns into Carquinez Scenic Drive, until the road dead-ends into the Carquinez Strait Regional Shoreline Park parking lot. The Loner Boner Boulder can be seen from the parking lot up on a small hill, just east of due south. From the parking lot, cross the road and find a fenced off access road which leads directly to the boulder. The boulder is on the left side of the road approximately 1000 feet from the gate.

Rock is chossy. Please be considerate and try to climb statically so you don’t break holds. Founder: TJ Schoonhoven. For beta videos: @titus.teejay on Instagram and @leonard_the_king Park at Solano Community College, cross the street, walk east along the road, and enter gate at base of the hill. Hike up the hill and then make your way east to the boulder.