Flagpole

Historical marker location:

1501 Mt. Diablo Boulevard, Walnut Creek, California

( Marker is on Mt. Diablo Boulevard near South Main Street, on the right when traveling east.)

Mt. Diablo Blvd. at Main Street. 1917.

California was the site of the nation's first successful oil well in 1892. The well was drilled in the city of Los Angeles and produced about 25 barrels of oil a day. Today, California remains a major oil-producing state.