Sewer Wave is a scrappy little natural feature tucked on the outskirts of Ottawa on the Ottawa River, easy to miss if you don't already know the eddy. Locals rig a rope for tow-ins, though paddling in under your own power works fine too depending on the level. It's at its best between 58.4m and 58.9m on the Britannia gauge, so check that before you make the drive. Nothing fancy, but it's a reliable local session when the bigger Ottawa waves are off or too crowded.