California Historical Landmarks in Alameda County
California Historical Landmark 962
Blossom Rock Navigation Trees
Madrone Picnic Area
Thomas J. Roberts Recreation Area
Redwood Regional Park
11500 Skyline Boulevard
Period Prior to 1855
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.
California Registered Historical Landmark No. 962
Plaque placed by the State Department of Parks and Recreation in cooperation with the East Bay Regional Park District, August 23, 1986.