Well "Hill 4"

Santa Barbara County · Between Lompoc and Santa Maria · location approximate

This well, spudded September 26, 1905, and completed April 30, 1906, is the first oil well in which a water shutoff was attained by pumping cement through the tubing and back of the casing—forerunner of the modern cementing technique. It was drilled by Union Oil Company of California to a depth of 2,507 feet, and 1,872 feet of 10-inch casing and 2,237 feet of 8-inch casing were so securely cemented off that the well subsequently produced for over 45 years.

1971 register text, presented as a historical document. It uses the period's terms for Native people; the state's landmark listings still carry most of this wording, and the California Office of Historic Preservation maintains the program's current texts.

Many of these plaques have since been recast or their texts revised. The California Historical Landmarks program and its current texts are maintained by the California Office of Historic Preservation. California Office of Historic Preservation ↗

David Rumsey Map Collection, Stanford Libraries

Marker data: State of California, Department of Parks and Recreation, California Historical Landmarks (1971)

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