Multnomah Falls is a waterfall located on Multnomah Creek in the Columbia River Gorge, east of Troutdale, in Oregon, United States. Spanning two tiers on basalt cliffs, it is the tallest waterfall in the state of Oregon at 620 ft (189 m) in height.

The land surrounding the falls was developed in the early twentieth century, with a pathway, viewing the bridge, and adjacent lodge being constructed in 1925. The Multnomah Falls Lodge and the surrounding footpaths at the falls were added to the National Register of Historic Places in 1981.

The waterfall formed around 15,000 years ago from floods. According to a legend from the Multnomah tribe (from whom the falls take their namesake), the waterfall was formed after a young woman sacrificed herself to the Great Spirit to save Multnomah village from a plague by jumping from the cliff, and the Multnomah peoples were saved. After her death, water began to flow from above the cliff, creating the waterfall.

The falls were noted in the journals of explorers William Clark and Meriwether Lewis during their expedition through the Columbia River Gorge in 1805. In an October 30 journal entry, Lewis notes, "(I) passed several places where the rocks projected into the river & have the appearance of having separated from the mountains and fallen into the river, small niches are formed in the banks below those projecting rocks which is common in this part of the river,"

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