VICKSBURG, Miss. (AP) — Cleanup crews with booms skimmed oily water from the Mississippi River a day after a barge with more than 80,000 gallons of oil struck a railroad bridge near Vicksburg, spreading a sheen of light crude that kept part of the waterway shut to ship traffic Monday, authorities said.

It remained unclear Monday morning how much oil had leaked into the river, according to the Coast Guard and Army Corps of Engineers.

Coast Guard spokesman Petty Officer 3rd Class Jonathan Lally said that on Monday afternoon, oil was "still discharging, but it is slowly discharging."