Alaska's Best Whitewater Rafting. Located on Alaska's Keani Peninsula, Six Mile Creek is a whitewater paradise 70 miles from Anchorage. Dropping over 50 feet per mile as it flows out of the Chugach Mountains. Six Mile Creek has cut its way through three separate canyons offering Class 4 and Class 5 whitewater. Choose between three different trips departing in the morning and afternoon. We provide all necessary river gear including a full dry suit.