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• Although those accidents account for less than 1 percent of the total number of pipeline accidents, the consequences of a release in water can be much more severe because of the threats to drinking water supplies and the heightened potential for environmental damage.
• The 16 spills cost companies almost $200 million combined in property damages, lost product, cleanup work and other expenses, according to an AP review of accident records.
• The most recent accidents came during flooding in 2011 throughout the Missouri River Basin.
• Those include the Yellowstone River spill that saw a severed Exxon Mobil Corp. pipeline release 63,000 gallons. A NuStar Energy LP pipeline also spilled 4,200 gallons of anhydrous ammonia into the Missouri River in Nebraska, and an Enterprise Products Partners LP pipeline released 28,350 gallons of gasoline into the Missouri River in Iowa.
• U.S. Sen. Max Baucus, who requested the report with fellow Montana Democratic Sen. Jon Tester, said the results reveal "some pretty clear holes in pipeline oversight when it comes to flooding."
• But Baucus said the report leaves unanswered basic questions about what steps can be taken to prevent future accidents.
• Transportation Department officials will next evaluate whether pipeline crossing rules such as the 4-foot depth requirement are sufficient, said Jeannie Layson, communications director for the agency's Pipeline and Hazardous Materials Safety Administration.
• The agency must deliver another report to Congress within the next year to update lawmakers on its plans.
• Pipeline companies are required to inspect crossings under navigable waterways at least once every five years.
• An industry representative cautioned against imposing stringent new regulations. Those could force companies to divert money from other safety initiatives such as reducing accidents caused by corrosion or excavation damage, said John Stoody, of the Association of Oil Pipe Lines.
• The water crossings report showed riverbed scouring around pipelines caused by flooding "is a real but rare occurrence," Stoody said.
• "It's our hope the focus remains on efforts that will provide the most public safety and protection for the environment," he said, adding that companies spent at least $1.1 billion on evaluations, inspections and maintenance geared toward safety in 2011.

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