The Nellie Johnstone No. 1 well, Oklahoma's first commercially successful oil well, was discovered on April 15, 1897, near Bartlesville. Drilled by the Cudahy Oil Company, the well struck oil at a depth of about 1,320 feet, producing roughly 50 barrels per day. This discovery marked the beginning of Oklahoma's oil boom, attracting speculators, drillers, and businesses eager to capitalize on the newfound resource. Unlike earlier oil seeps and failed attempts, Nellie Johnstone No. 1 proved that commercial oil production was viable in the region. The success of the well led to the rapid development of the Bartlesville oilfield and helped establish Oklahoma as a leading oil-producing state. Today, the site is commemorated as a historic landmark, recognizing its role in launching Oklahoma's petroleum industry.