The break near Billings, in south-central Montana, fouled the riverbank and forced municipalities and irrigation districts to close intakes.
An Environmental Protection Agency spokeswoman Sonya Pennock said an unspecified amount of oil could be seen some 40 miles downriver during a fly-over Sunday, and there were other reports of oil as far as 100 miles away near the town of Hysham.
But an Exxon Mobil Corp. executive said shoreline damage appeared to be limited to the Yellowstone between Laurel and Billings, which includes about 20 miles of river.
Exxon Mobil Pipeline Co. President Gary Pruessing said company observers flying over the river had seen "very little soiling" beyond Billings, and that the oil appeared to be evaporating and dissipating into the river as the flooded Yellowstone carries it downstream.
A representative of the Montana Disaster and Emergency Services Division said the company's claim was reasonable but had not been independently verified.
State officials on Saturday had reported a 25-mile long slick headed downstream toward the Yellowstone's confluence with the Missouri River, just across the Montana border in North Dakota. An estimated 1,000 barrels, or 42,000 gallons, spilled Saturday before the flow from the damaged pipeline was stopped.
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