Los Angeles City Oil Field, Los Angeles, California, United States

The Los Angeles City Oil Field is a large oil field north of Downtown Los Angeles. Long and narrow, it extends from immediately south of Dodger Stadium west to Vermont Avenue, encompassing an area of about four miles (6 km) long by a quarter-mile across. Its former productive area amounts to 780 acres (3.2 km2).
Discovered in 1890, and made famous by Edward Doheny's successful well in 1892, the field was once the top producing oil field in California, accounting for more than half of the state's oil in 1895. In its peak year of 1901, approximately 200 separate oil companies were active on the field, which is now entirely built over by dense residential and commercial development. As of 2011 only one oil well remains active – behind a fence on South Mountain View Avenue one block east of Alvarado Street in the Westlake neighborhood, producing about 3.5 barrels per day (0.56 m3/d). The fortunes made during development of the field led directly to the discovery and exploitation of other fields in the Los Angeles Basin. Of the 1,250 wells once drilled on the field, and the forest of derricks that once covered the low hills north of Los Angeles from Elysian Park west, little above-ground trace remains.