Horseshoe, and Brine Line levels -the extreme river left side channel. Starts with the Flume, a big slide into a wall, followed by a hole. Then, sneak far left
Enter the narrow slot against the river left shore, boof 2-3' onto a boil, and slide down a broken shelf. You must anticipate the cross current or it will push you into the inhospitable crack on the left. Pencil Sharpener is the preferred option when LF < 2.80.