Louisiana (NBC33) — A few boats are getting through a block in the Mississippi River today caused by a tanker accident.

The Coast Guard allowed a couple southbound vessels to pass in order to test how the traffic would affect efforts to remove oil from a leaking barge.

The Coast Guard says 7,000 gallons of crude oil were unaccounted for, but some could have seeped inside the barge.

The oil barge hit a railroad bridge early Sunday. There are still more than 50 barge tows waiting to pass through in both directions.