Following the signs from
Still producing in 1961
Late in 1876, Alex Mentry bored down an additional 300 feet and produced a gusher that hit the top of the 65 foot derrick, and it settled into a production of 150 barrels a day from 25, making further drilling and production in Pico Canyon possible. They finally capped No. 4 in 1990 after a 114 year run, making it the longest continually producing well in the world. In the seating arrangement for state and national historic landmarks, Pico Well No. 4 sits in the right field bleachers.
Access closed on day of visit
Plaque inscription: NO. 516 WELL, CSO 4 (PICO 4) - On this site stands CSO-4 (Pico No. 4),
USGS Quadrangle Sheet Name:
Google maps: 34.373031,-118.626267