Rainy Lake Falls is a waterfall on the inlet stream of namesake Rainy Lake in Chelan County, Washington. The stream heads in a pair of small lakes and the remaining portions of the Lyall Glacier, and flows down a cascade that is said to be approximately 850 feet (260 m) high. The falls drop over several tall rock steps, with a largest single drop of 300 feet (91 m). Each of its three tiers is about 80 feet (24 m) wide. A steep talus cascade is also found at the foot of the falls. Rainy Lake's outlet stream eventually flows into the Stehekin River.