The Alamitos oil well #1 or Alamitos #1 is the site of a famous oil well in Signal Hill, California, the start of the Long Beach oilfield. The spot is also known as Porcupine Hill. The Alamitos well #1 was designated a California Historic Landmark on May 1, 1957. The Signal Hill oil discovered in 1921 became the black gold of Southern California. Alamitos #1 started drilling on March 23, 1921. The leader of the drilling was O.P. "Happy" Yowells. On June 23 at 9:30 a.m. the drill, at about 2,765 feet down, hit oil that was trapped underground. The trapped oil was pressurized by natural gas. The pressure pushed the blowout oil 114 feet into the air, when the drill hit the oil. The drilling rig collapsed in the blowout. A new clean well was drilled nearby and started production on June 25, 1921. Alamitos oil well #1 put out 600 barrels a day and 700,000 barrels before running out.