Minnesota officials say the magnitude and widespread geographic nature of flooding make a federal disaster request a near certainty.
Damage assessments have begun but other surveying must wait until waters from downpours in the past week subside.
Minnesota created a $3 million contingency fund this year to match any federal aid for disasters but that could be exhausted quickly. Gov. Mark Dayton said Friday he isn't ruling out the need for a special session if more funds are required.
Winona Representative Gene Pelowski, who authored the bill to create the state contingency fund, said it could be used to avoid a special session if it's enough money to cover losses.
After heavy rains over several days, crops are flooded, roads have been washed out, dams have failed and water has infiltrated homes from the far north to the far south of Minnesota.