Shipments of Bakken crude oil from North Dakota to California by barge have quietly overtaken those by train for the first time, showing how the state’s isolated refiners are using any means necessary to tap into the nation’s shale oil boom.

While tough permitting rules and growing resistance by environmentalists have slowed efforts to build new rail terminals within California itself, a little-known barge port in Oregon has been steadily ramping up shipments to the state, a flow expected to accelerate next year.

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