GRAND FORKS, North Dakota (Reuters) - The swollen Red River crested at the third highest level on record at Grand Forks, and flood conditions were complicated by forecasts for snow and freezing temperatures, forecasters said on Friday.
Final figures are not in, but the Red River reached a crest on Thursday at Grand Forks and continues to spread out across regions north of the city, reaching eight miles wide or more at Oslo, Minnesota, which has become an island amid the swells, the National Weather Service said on Friday.
The Red River forms the North Dakota-Minnesota border, flowing north into Canada. A tributary system stretching from southern Canada and South Dakota feeds into the main Red River as it reaches toward Lake Winnipeg in Manitoba.
"We will be dealing with flood issues throughout April and well into May," said Greg Gust, a U.S. National Weather Service warning coordination meteorologist. "It will be a long time before we push the last of the flood waters across the Canadian border."
At just under 50 feet, the Red River crest at Grand Forks was the third highest on record and three of four bridges are expected to stay closed at least well into next week.
"Water is still pretty high through town here, things still blocked off and buttoned up," Gust said.
Grand Forks and neighboring East Grand Forks, Minnesota, have permanent flood barriers that have protected them from the near-record crest, leaving the focus on communities nearby.
North of Grand Forks, Interstate 29 that runs parallel along the Red River in North Dakota has been closed for miles. The interstate was just opened north of Fargo in recent days.
Complicating efforts on Friday, storms could drop up to 8 inches of snow in the area west of Fargo and lesser amounts in Fargo and northwest Minnesota, the weather service said.
North Dakota farm officials said Friday they were concerned that the snowstorm could create conditions similar to those that killed tens of thousands of cattle in other flood years.
Major overland flooding west and north of Fargo is expected into late April as water released from dams on tributaries makes its way slowly through Fargo to the Red River.
"The water that is breaking out over land is diminishing somewhat, but it will re-fill in," Gust said. "The rural areas just to the west and north of Fargo, that is going to be heavily impacted for quite a while."
Fargo itself could come close to 2009 levels when the Red River stayed above major flood stage for 32 days and flood stage for 60 days, Gust said.
This year's expansive flooding also was expected to have a major impact on the amount of land North Dakota farmers will be able to plant this spring.
(Writing by David Bailey; Additional reporting by Doug Barrett and Rod Nickel; Editing by Greg McCune)