WellheadMap

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Koster 1

Plugged Dry hole well

API number04-077-20135
OperatorGreat Basins Petroleum Co.
CountySan Joaquin, California
Spudded1971-05-19
Surface location37.625942, -121.341644 · wells within 1 mile
Directions to the wellhead: Google Maps Apple Maps Waze
State recordCalifornia Geologic Energy Management Division (CalGEM) ↗
Data as of2026-10-19

From California Geologic Energy Management Division (CalGEM) public records. Verify with the state before relying on this information.