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 800 feet (243.8 m) high.

The falls drop 850 feet (259.1 m) over several tall rock steps, with a largest drop of 300 feet (91.4 m), in three distinct tiers about 80 feet (24.4 m) wide. A steep talus

Scree

Scree, also called talus, is a term given to an accumulation of broken rock fragments at the base of crags, mountain cliffs, or valley shoulders. Landforms associated with these materials are sometimes called scree slopes or talus piles...

  cascade is also found at the foot of the falls. Rainy Lake’s outlet stream eventually flows into the Stehekin River

Stehekin River

The Stehekin River is a river located in Washington state in the Pacific Northwest of the United States. It is the main river flowing into Lake Chelan. Miners arrived in Stehekin River Valley in the late 19th century. They were followed by homesteaders in the early 20th century...

.

The drainage area of Rainy Lake Falls is very small, but its sources allow it to retain water all year long, with best flows from May through August. It is located alongside the North Cascades Highway.