North Dakota's crude oil output has passed the 1 million barrels per day mark, according to recent data, the Minneapolis Star Tribune reported. The state's Bakken and Three Forks shale oil plays produced 1,001,149 barrels per day in April, a new all-time high. The milestone represents a 20-fold boost in the state's oil production in just six years. North Dakota is the nation's No. 2 oil-producing state behind Texas.