Site information:

In trees west of Madrone Picnic Area, Roberts Regional Recreation Area off of Skyline Rd, Oakland

Plaque amd site located in a park and may have access restricted to operating hours.  Original trees are no longer around, according to the plaque.

37.81086,-122.174461

Plaque information:

State plaque

Plaque text:

Site of Blossom Rock Navigation Trees

Until at least 1851, redwood trees on this site were used as landmarks to avoid striking the treacherous submerged Blossom Rock, in San Francisco Bay, west of Yerba Buena island. Although by 1855 the original stems had been logged, today's trees are sprouts from their stumps.

Plaque placed by the State Department of Parks and Recreation in cooperation with the East Bay Regional Park District, August 23, 1986.

Registered 11/13/1984