Showers have made the lot muddy in the fair's second week. Volunteers tell NTV vehicles have gotten stuck.
Vehicles are still being parked in the main lot and shuttles are running.
"Grounds are wet, parking lots are wet, we're actually making plans to divert some of that water and we're making plans for the weekend realizing the grounds could be a little wet," said Fair Director Joseph McDermott on Wednesday.
McDermott said the fair has a gravel contractor on standby 24 hours a day.
To view live video of the Nebraska State Fair main parking lot, click here.
For fair traffic updates, follow the Grand Island Police Department on Twitter.