All watercraft use in the park requires a wilderness permit. These permits are free and can be obtained at the Zion Canyon Visitor Center the day before or the day of your trip. To find out when the Wilderness Desk is open, read about our operating hours. Permits are issued when the river is flowing in excess of 150 cubic feet per second. Watercraft must be specifically designed for whitewater use. Operators must be equipped with approved personal flotation devices.