Highway 14 north of Marshalltown and Highway 330 near Albion were closed Monday night north of Marshalltown after heavy rains caused the Iowa River to overflow.
Kim Elder, Marshall County Emergency Management director, said the Iowa River crested at 18.91 feet Monday afternoon and after more rain it will crest at 22.9 feet on Tuesday. The flood stage is 19 feet.
The Iowa Department of Transportation and the Marshall County secondary roads watch for water reaching the major roadways, Elder said.
"The water has to go down for it to be open again," Elder said. "It won't crest until Tuesday night. My guesstimate is that it won't open until the end of the week."
Garry Brandenburg, retired Marshall County Conservation Board director, said radar maps show more rain coming into the area.
"The record was last year at 22.08 feet in late May," Brandenburg said. "Since the river is full now and spilling out of its banks into the adjacent flood-plain lands, there is nowhere for new rain water to go. It has to spread out to cover more flood-plain lands."
Elder strongly advises drivers to avoid flooded areas.
"People shouldn't go in the water or try to drive in it because it is dangerous," Elder said.
Kara Kelly, regional communications officer with the American Red Cross, said people should also be prepared for floods.
The best ways to prepare for floods are by creating and practicing a disaster plan, assembling an emergency preparedness kit, heeding flood warnings and relocating during flood warnings, she said.
Monday's severe weather also left 3,200 Alliant Energy customers without power.
Heather Holmes, Alliant Energy spokesperson, said Alliant Energy is assessing damages.
It could be 24 to 48 hours until the power is back on depending on the severity of the damages, Holmes said
According to the National Weather Service, rain will continue until Wednesday.
"We're going to have about three days or so of a pretty high river," Elder said. "Then it should start dropping off fairly quickly."
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