Plummeting 620 feet from its origins on Larch Mountain, Multnomah Falls is the second highest year-round waterfall in the United States. Nearly two million visitors a year come to see this ancient waterfall making it Oregon?s number one public destination...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.