The Clarence Iverson No. 1 well, located near Tioga, North Dakota, made history on April 4, 1951, as the state's first commercially successful oil well. Drilled by Amerada Petroleum Corporation, it reached a depth of 10,500 feet before striking oil in the Madison Group, a limestone formation within the Williston Basin. On its first day of production, the well yielded 240 barrels of oil, proving that North Dakota had viable petroleum reserves. This discovery sparked an oil boom, leading to thousands of additional wells and transforming the state's economy.