Residents are asked not to travel except for necessary reasons, such as getting to work or emergencies, due to worsening flooding.
The county is now under a travel watch, which means drivers should remain off the roads if possible, Johnson County Emergency Management Agency director Stephanie Sichting said.
Sichting spoke with commissioner Brian Baird and highway director Luke Mastin and the three agreed on the restriction.
Most roads are becoming covered with water which makes it difficult to see lane lines, Baird said. Strong currents running across rural roads are also pushing vehicles into side ditches, he said.
Baird was traveling to his home near Trafalgar from Greenwood on Saturday evening and saw road conditions worsen first hand.
"I think it's the safest thing for residents at this time," Baird said.