The discovery well for the East Poplar field was completed in March, 1952. On December 1, 1954, there were 53 producing oil wells in the field which had proved approximately 15,000 acres to be productive.

The field is located on a large, northwest-southeast anticline. Oil is obtained from limestone beds in the Charles formation of Mississippian age. The accumulation is partly controlled by porosity variations. During the first 11 months of 1954, more than one out of every 5 barrels of oil produced in Montana came from the East Poplar field.

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