Montana Governor Brian Schweitzer, left, is briefed by Gary Pruessing, ExxonMobil Pipeline Co. president, right, during a briefing about an oil spill Yellowstone River while in Billings, Mont. Tuesday July 5, 2011. The Yellowstone River swelled above flood levels Tuesday, raising fears that the surge will push thousands of gallons of oil spilled from a broken pipeline into undamaged areas and prolong cleanup efforts as crude seeps downstream and into back channels. (AP Photo/Jim Urquhart)

Associated Press
Montana Governor Brian Schweitzer, left, is briefed by Gary Pruessing, ExxonMobil Pipeline Co. president, right, during a briefing about an oil spill Yellowstone River while in Billings, Mont. Tuesday July 5, 2011.  The Yellowstone River swelled above flood levels Tuesday, raising fears that the surge will push thousands of gallons of oil spilled from a broken pipeline into undamaged areas and prolong cleanup efforts as crude seeps downstream and into back channels.  (AP Photo/Jim Urquhart)
Montana Governor Brian Schweitzer, left, is briefed by Gary Pruessing, ExxonMobil Pipeline Co. president, right, during a briefing about an oil spill Yellowstone River while in Billings, Mont. Tuesday July 5, 2011. The Yellowstone River swelled above flood levels Tuesday, raising fears that the surge will push thousands of gallons of oil spilled from a broken pipeline into undamaged areas and prolong cleanup efforts as crude seeps downstream and into back channels. (AP Photo/Jim Urquhart)
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