Almost half the spill - an estimated 100,000 gallons - had been contained with booms near the derailment site and an additional boom placed about 5 miles downstream, BNSF spokesman Andy Williams said.
The railroad will focus on environmental recovery. Williams says some of the tankers were compromised, causing the oil to leak into floodwaters and eventually into the rain-swollen Little Rock River, but officials don't yet have an exact number of tankers that leaked oil.
The train's operator BNSF said 14 of the derailed cars had leaked oil, the Lyon County Daily News reported.
The Associated Press In this aerial drone image taken from video and provided by the Sioux County Sheriff's Office, tanker cars carrying crude oil are shown derailed about a mile south of Doon, Iowa, on Friday.
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Lyon County Sheriff Steward Vander Stoep said between 30 and 40 semitrailers containing cleanup equipment had arrived at the scene near Doon, Iowa, by Friday afternoon.
Sheriff Vander Stoep said, "There is so much food for the workers and for us at the incident command, it's just unbelievable how little these communities come together".
The train was carrying tar sands oil from Canada to Oklahoma for ConocoPhillips.
Rock Valley, Iowa, just southwest of the derailment, shut off its water wells within hours of the accident.
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He said Saturday that the cause of the derailment hasn't been determined. Floodwater along the Little Rock River is running over a road north of the track. "We've had skimmers working since yesterday on the floodwater south of the site".
Olson says the city will use the rural water supply until testing by the Iowa Department of Natural Resources confirms the safety of the city's drinking water. ConocoPhillips spokesman Daren Beaudo said each tanker can hold more than 25,000 gallons (20,817 imperial gallons) of oil. "We had a large supply in our water towers and we are using our interconnection with rock valley rural water to recharge our water supply".
The service has issued flood warnings for several other rivers and creeks in the area, including the Big and Little Sioux rivers, the Floyd River and the Ocheyedan River near Spencer.
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