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Fed by underground springs from Larch Mountain, the flow over the falls varies usually being highest during winter and spring. Multnomah Falls offers one of the best places in the Columbia River Gorge National Scenic Area to study geology exposed by floods. Five flows of Yakima basalt are visible in the fall's cliff face. From the information center, visitors can follow the 2.4 mile (RT) trail that climbs approximately 600 feet to the top of Multnomah Falls. This trails provides great views of the falls and the Columbia River Gorge. Once at the top of the falls, hikers can continue onward for six miles to the top of Larch Mountain or take the six mile Wahkeena Loop trail.
Every year over 200,000 visitors hike well-worn trails to view Grotto, Laurel, Abrams, Rainbow, and other popular waterfalls in the park. Large waterfalls attract the crowds, but smaller cascades and falls can be found on nearly every river and stream in the park. The Great Smoky Mountains abound with the two ingredients essential for waterfalls-ample rainfall and an elevation gradient.