White County Emergency Management director Gordon Cochran said boats had been called out to assist in evacuations in the Monticello area.
Carroll County Emergency Management director Dave McDowell told WXIN-TV that "a couple hundred" homes may be effected, but that many are summer residences not currently occupied.
The National Weather Service reported near-record flooding at the Norway and Oakdale dams just north of Monticello, a city of some 5,700 people about 25 miles north of Lafayette.
Some roads had washed out in the area, including Indiana 16 east of Monon.
