Approximate - nearest available gauge. Use as general reference only.
A Class III lead in with great surf opportunity leads to Drain Pipe. You'll know you're there when you see a large culvert coming out from under the railroad that hangs high above the river. Difficult to scout once you're on the water but easily scouted from the highway.
Drain Pipe has 3 doors to choose from. The right drop is the most straight forward, where you punch through a small hole. The center drop is the most difficult, it's a tall boof with a dynamic hole at the bottom. The left drop is a left-to-right move, punching a couple small holes.