Thousands of homes were destroyed or extensively damaged and about a third of the state's land used for corn was destroyed, the governor said.
The state was the last to ban people convicted of felonies from voting or holding public office for life.
Gov. Kim Reynolds confirmed she will issue an executive order restoring voting rights to felons ahead of this year's election. Iowa is the only state with such a ban.
Civil rights officials are looking into possible human experiments conducted at Glenwood Resource Center.
Emails show that Iowa Department of Human Services Director Jerry Foxhoven routinely sent messages to employees lauding the rapper even after at least one complained to lawmakers.
The majority Republican chamber overwhelmingly supported the measure.
“I don’t believe that voting rights should be forever stripped, and I don’t believe restoration should be in the hands of a single person,” she said.
There's no disputing what the Iowa congressman represents.
The judge sided with Planned Parenthood of the Heartland and the American Civil Liberties Union of Iowa in a lawsuit.
“We are No. 1 in the country when it comes to protecting life,” Republican Gov. Kim Reynolds said.