High water and a swift current has helped break up an oil spill . BP says about 750 to 800 barrels of oil spilled in the spill . The spill occurred when a pipeline ruptured near Billings . Cleanup efforts have been hampered by flooding .
High water and a swift current has helped break up an oil spill . Exxon says about 750 to 1,000 barrels of oil spilled in the Yellowstone . The spill occurred when a pipeline ruptured near Billings . Cleanup efforts have been hampered by flooding .