Windy Saddle is a few miles up the Lookout Mountain Road, officially called Lariat Loop. The ice is a long way down below, on the west side of the parking lot. The flow is very well hidden and can't be seen from either the overlook or down on US 6. The easiest way to spot it is from the Stumbling Block, across the canyon.
When the river is frozen, approach from below. Otherwise, hiking down from Windy Saddle is possible, but very strenuous.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Windy Saddle Ice Flow:
Windy Saddle Ice Flow aka Secret Waterfall WI2+ Ice, 1 pitch, 75 feet
Featured Route For Windy Saddle Ice Flow