I Was out on April 26th last year and the North and Middle Channel markers were NOT in yet. Be careful. At the worse, you could always head up the South Channel and head back down the North Channel at Algonac. I tried to shoot the middle channel last year without the markers and I'm amazed I didn't run ground. It's damn shallow out there. I wouldn't try it with anything that has much more than a foot of draft at speed.