It is recommended that you wear personal flotation devices while boating, fishing or rock-hopping when water levels reach five feet or more. When kayaking or canoeing it is required that you wear a personal floatation device no matter the water level.
The river bottom is uneven, so it’s still possible to get in over your head even when the river level is low. Wear close-toed shoes when in the water, and if swept up by a rapid, float feet first to protect your head until you can swim free.