Re: Petit Bois/Dauphin Island Pass and Perdido Pass
I recommend that you line up with the buoy at the entrance of Perdio Pass and then enter the pass. Stay in the marked channels throughout. This is discussed more detail in ActiveCaptain. The current can be exciting (at least it is for me).
The channel splits and the only channel I have used is the east channel with 55 feet of bridge clearance and good depth. This channel is close to the shore so as you enter be sure to stay close to the bridge footing on the port side as the channel gets shallow quickly toward the shore. Also be aware that as you are leaving, the current follows the bridge footing under the bridge but then quickly goes about 45 degrees to starboard which tends to draw your boat toward the east piling. You might want to get there during daylight.
Where will you keep your boat while there? I am on Ono Island.