New West Feature

Oil Spill on the Yellowstone’s Threat to Fish, Other Wildlife, Humans Under Investigation

Endangered sturgeon, sport fish at risk as Exxon, state and federal officials respond to ruptured pipeline carrying crude oil to Billings.

By Kate Schwab, 7-06-11

  Map of Yellowstone River basin courtesy Montana DNRC.
  Map of Yellowstone River basin courtesy Montana DNRC.

It’s too early to tell how much Saturday’s oil spill on the Yellowstone River will ultimately affect aquatic wildlife, Bruce Farling, the executive director for Montana Trout Unlimited, said Tuesday.

The spill took place in “a transitional reach where coldwater species start giving away to cool- and warm-water species,” he said in an e-mail. No federally listed endangered species live within the spill zone, and that section of river is not part of the pristine “blue ribbon” section prized by trout anglers. That’s the good news. But in addition to goldeye, sauger and channel catfish—all native game fish—the area is home to popular non-native sportfish such as rainbow and brown trout, smallmouth bass and walleyes, as well as non-sport species, including minnows, longnose dace and Flathead chub.

More worrisome, the pallid sturgeon, which is endangered, and its relative, the shovelnose sturgeon, are found downstream from Miles City. Should the oil reach that far, it could prove problematic, Farling noted.

“Right now sturgeon larvae are probably in side-channels, where the oil is most likely to settle,” he said. “It’s still too early to tell how this will play out. There’s a lot of river between the failed pipeline and the sturgeon reach.”

ExxonMobil reported the accidental release of an unknown amount of crude oil into the Yellowstone River at Laurel on Saturday morning. The oil came from a rupture on the Silvertip Pipeline, which supplies crude to a Billings refinery. The company now estimates that between 750 and 1,000 gallons of oil were dumped into the river before the spill could be contained. ExxonMobil president Gary Pruessing issued a formal apology to state residents on Sunday. The company is still trying to figure out what caused the pipeline to fail.

Weather Factors

Snowmelt is continuing to fill the river, which was running just below flood stage Tuesday. A flood warning from the National Weather Service remains in effect for the Billings area, with a 30 to 40 percent chance of local thunderstorms predicted through Friday. The flooding danger has been complicating cleanup efforts, increasing the likelihood that oil will be spread farther downstream.

Governor’s Response

Gov. Brian Schweitzer, who visited the spill site Tuesday, said state agencies were committed to holding ExxonMobil accountable until cleanup was satisfactorily complete.

“The parties responsible will restore the Yellowstone River,” Schweitzer said. According to the governor’s office, most of the oil has been collecting along the river’s south bank.

Threat to Wildlife and Drinking Water

Potential hazards to wildlife from that accumulated oil include chemical poisoning, especially benzene, from the petroleum, and smothered fish eggs or fry, Farling said. In addition to toxin buildup in birds of prey, large invertebrates, humans and other predators, turtles, fur-bearing mammals and waterfowl may all be at risk. Unfortunately, it’s all speculative because it really depends on where the oil ends up, Farling said.

Several news reports are saying that one dead duck can be attributed to the spill, but so far, Exxon’s media releases are continuing to claim that the company has not “received any confirmed reports of impacted wildlife.” State wildlife officials did not immediately respond to a request for comment Tuesday.

Groundwater pollution, and contamination spread through irrigation or surface water withdrawals, is another serious possibility, Farling added. The city of Billings, just downstream from Laurel, gets its drinking water from the Yellowstone.

“The fact that there is oil above bankfull elevations on some streamside properties means, if not cleaned up, it will be available to be leached into soil, alluvial groundwater and surface water later,” he said.

Federal Investigation

According to Reuters, the Pipeline and Hazardous Materials Safety Administration, a branch of the U.S. Department of Transportation responsible for overseeing pipelines, has opened an investigation, and the pipeline will not be able to resume operations without the agency’s approval. The pipeline has run into problems before, and was last inspected in December. So far, there is no publicly available information to suggest that any part of the system was not up to legal standards.

A statement from ExxonMobil on Monday reported that more than 280 people, including Exxon personnel and private contractors, are actively involved in the spill cleanup. Other agencies working with the company include Montana Fish, Wildlife and Parks; Montana Department of Environmental Quality; Environmental Protection Agency; U.S. Department of Transportation and local government and disaster preparedness officials in Yellowstone County.



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